Polar bears (Ursus maritimus) in the northern Alaska region den in coastal areas and on offshore drifting ice. We evaluated changes in the distribution of polar bear maternal dens between 1985 and 2005, using satellite telemetry. We determined the distribution of maternal dens occupied by 89 satellite collared female polar bears between 137°W and 167°W longitude. The proportion of dens on pack ice declined from 62% in 1985–1994 to 37% in 1998–2004 (P = 0.044) and among pack ice dens fewer occurred in the western Beaufort Sea after 1998. We evaluated whether hunting, attraction to bowhead whale remains, or changes in sea ice could explain changes in den distribution. We concluded that denning distribution changed in response to reductions in stable old ice, increases in unconsolidated ice, and lengthening of the melt season. In consort, these changes have likely reduced the availability and quality of pack ice denning habitat. Further declines in sea ice availability are predicted. Therefore, we expect the proportion of polar bears denning in coastal areas will continue to increase, until such time as the autumn ice retreats far enough from shore that it precludes offshore pregnant females from reaching the Alaska coast in advance of denning.
","language":"English","publisher":"Springer","doi":"10.1007/s00300-007-0300-4","issn":"07224060","usgsCitation":"Fischbach, A., Amstrup, S.C., and Douglas, D., 2007, Landward and eastward shift of Alaskan polar bear denning associated with recent sea ice changes: Polar Biology, v. 30, no. 11, p. 1395-1405, https://doi.org/10.1007/s00300-007-0300-4.","productDescription":"11 p.","startPage":"1395","endPage":"1405","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":239988,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","volume":"30","issue":"11","noUsgsAuthors":false,"publicationDate":"2007-06-07","publicationStatus":"PW","scienceBaseUri":"505a446de4b0c8380cd66acf","contributors":{"authors":[{"text":"Fischbach, Anthony S. 0000-0002-6555-865X afischbach@usgs.gov","orcid":"https://orcid.org/0000-0002-6555-865X","contributorId":200780,"corporation":false,"usgs":true,"family":"Fischbach","given":"Anthony S.","email":"afischbach@usgs.gov","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":116,"text":"Alaska Science Center Biology MFEB","active":true,"usgs":true}],"preferred":true,"id":431278,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Amstrup, Steven C.","contributorId":67034,"corporation":false,"usgs":false,"family":"Amstrup","given":"Steven","email":"","middleInitial":"C.","affiliations":[{"id":13182,"text":"Polar Bears International","active":true,"usgs":false}],"preferred":false,"id":431280,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Douglas, David C. 0000-0003-0186-1104 ddouglas@usgs.gov","orcid":"https://orcid.org/0000-0003-0186-1104","contributorId":150115,"corporation":false,"usgs":true,"family":"Douglas","given":"David C.","email":"ddouglas@usgs.gov","affiliations":[{"id":116,"text":"Alaska Science Center Biology MFEB","active":true,"usgs":true},{"id":117,"text":"Alaska Science Center Biology WTEB","active":true,"usgs":true},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":true,"id":431279,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70031525,"text":"70031525 - 2007 - Comparative performance of invasive and native Celastrus species across environmental gradients","interactions":[],"lastModifiedDate":"2012-03-12T17:21:14","indexId":"70031525","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2932,"text":"Oecologia","active":true,"publicationSubtype":{"id":10}},"title":"Comparative performance of invasive and native Celastrus species across environmental gradients","docAbstract":"The ability to understand and predict the success of invasive plant species in their new ranges is increased when there is a sympatric native congener available for comparison. Celastrus orbiculatus (oriental bittersweet) is a liana introduced into the United States in the mid-1800s from East Asia as an ornamental plant. Its native congener, Celastrus scandens (American bittersweet), ranges from the east coast of the United States as far west as Wyoming. In the Northeastern United States, C. orbiculatus is continuing to expand its range while C. scandens appears to be in serious decline. One hypothesis for this decline is that C. scandens does not have such a wide range of ecological tolerances in the current landscape as C. orbiculatus, which seems to tolerate a greater range of resource conditions. To investigate this hypothesis, we transplanted these two species into ten sites that spanned a full range of light and soil moisture conditions to compare their establishment and performance in terms of aboveground growth (biomass and height) and mortality. After two years, C. orbiculatus showed significantly lower mortality and greater biomass across all resource conditions compared to C. scandens. In addition, C. orbiculatus preferred more mesic soil moisture conditions, while C. scandens performed better in drier soil moisture conditions. Since much of the Northeastern United States is now forested, this preference for mesic soil conditions could make it more successful than C. scandens in the region. This study shows the utility of manipulative experiments, particularly those using congeneric native species as benchmarks, for assessing the causes and predicting the course of invasions. ?? 2007 Springer-Verlag.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Oecologia","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s00442-007-0839-3","issn":"00298549","usgsCitation":"Leicht-Young, S.A., Silander, J., and Latimer, A., 2007, Comparative performance of invasive and native Celastrus species across environmental gradients: Oecologia, v. 154, no. 2, p. 273-282, https://doi.org/10.1007/s00442-007-0839-3.","startPage":"273","endPage":"282","numberOfPages":"10","costCenters":[],"links":[{"id":212504,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s00442-007-0839-3"},{"id":239997,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"154","issue":"2","noUsgsAuthors":false,"publicationDate":"2007-08-28","publicationStatus":"PW","scienceBaseUri":"5059f821e4b0c8380cd4ced0","contributors":{"authors":[{"text":"Leicht-Young, S. A.","contributorId":41648,"corporation":false,"usgs":true,"family":"Leicht-Young","given":"S.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":431956,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Silander, J. A. Jr.","contributorId":20531,"corporation":false,"usgs":false,"family":"Silander","given":"J. A.","suffix":"Jr.","affiliations":[],"preferred":false,"id":431954,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Latimer, A.M.","contributorId":24167,"corporation":false,"usgs":true,"family":"Latimer","given":"A.M.","email":"","affiliations":[],"preferred":false,"id":431955,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70031965,"text":"70031965 - 2007 - Prioritizing bottomland hardwood forest sites for protection and augmentation","interactions":[],"lastModifiedDate":"2019-09-30T12:01:24","indexId":"70031965","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2821,"text":"Natural Areas Journal","active":true,"publicationSubtype":{"id":10}},"title":"Prioritizing bottomland hardwood forest sites for protection and augmentation","docAbstract":"Bottomland hardwood forest has been greatly diminished by conversion to agriculture. Less than 25% of the pre-Columbian bottomland hardwood forests remain in the southeastern United States. Because of the valuable ecological and hydrological functions performed by these forests, their conservation and restoration has been a high priority. Part of these restoration efforts has focused on developing tools that can be used for both assessments at the landscape level and policy implementation at the local level. The distribution of bottomland hardwood forests in the Cache and White River watersheds in eastern Arkansas were examined using existing GIS databases. Criteria were developed to select areas that should be conserved or augmented for wildlife habitat. Over 67% of the study area was classified as agriculture, with bottomland hardwood forest the next largest habitat class. The thickness of a forest fragment was defined as the radius of the largest circle that can be inscribed in a fragment. Thickness was used in three ways. First, individual forest fragments were identified and selected based on ecological function using criteria we established. Second, individual fragments that were too small to support interior species, but large enough that if moderately augmented they could recover that function, were identified and selected. These augmentable fragments were further prioritized by adjacency to habitat that might be suitable for reforestation, namely agriculture. Third, watersheds were prioritized for conservation and augmentation based on the size and distributions of forest fragment thickness and area within each watershed.","language":"English","publisher":"Natural Areas Association","doi":"10.3375/0885-8608(2007)27[72:PBHFSF]2.0.CO;2","issn":"08858608","usgsCitation":"Carter, J., and Biagas, J., 2007, Prioritizing bottomland hardwood forest sites for protection and augmentation: Natural Areas Journal, v. 27, no. 1, p. 72-82, https://doi.org/10.3375/0885-8608(2007)27[72:PBHFSF]2.0.CO;2.","productDescription":"11 p.","startPage":"72","endPage":"82","numberOfPages":"11","costCenters":[{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true}],"links":[{"id":242688,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Arkansas","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -92.197265625,\n 33.89321737944089\n ],\n [\n -90.087890625,\n 33.89321737944089\n ],\n [\n -90.087890625,\n 36.16892253622743\n ],\n [\n -92.197265625,\n 36.16892253622743\n ],\n [\n -92.197265625,\n 33.89321737944089\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"27","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a8c71e4b0c8380cd7e6bc","contributors":{"authors":[{"text":"Carter, J. 0000-0003-0110-0284 carterj@usgs.gov","orcid":"https://orcid.org/0000-0003-0110-0284","contributorId":81839,"corporation":false,"usgs":true,"family":"Carter","given":"J.","email":"carterj@usgs.gov","affiliations":[{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true}],"preferred":true,"id":433915,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Biagas, J. 0000-0001-5548-1970","orcid":"https://orcid.org/0000-0001-5548-1970","contributorId":51558,"corporation":false,"usgs":true,"family":"Biagas","given":"J.","affiliations":[],"preferred":false,"id":433914,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70032054,"text":"70032054 - 2007 - Survey trends of North American shorebirds: Population declines or shifting distributions?","interactions":[],"lastModifiedDate":"2018-03-29T14:01:13","indexId":"70032054","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2190,"text":"Journal of Avian Biology","active":true,"publicationSubtype":{"id":10}},"title":"Survey trends of North American shorebirds: Population declines or shifting distributions?","docAbstract":"We analyzed data from two surveys of fall migrating shorebirds in central and eastern North America to estimate annual trends in means per survey and to determine whether trends indicate a change in population size or might have been caused by other factors. The analysis showed a broad decline in means per survey in Atlantic Canada and the northeastern United States (North Atlantic region). For example, 9 of 9 significant trends in this region were <1 (P=0.004), and the mean, annual rate of change among 30 species was 0.9783, a decline of −2.17% per year (P<0.001). Trends in the midwestern United States (Midwest region) showed no clear pattern. The mean among 29 species was 1.0090 (P=0.35). Only 4 of the trends were significant. Several hypotheses were evaluated to identify causes of the declining means per survey in the North Atlantic region. The most likely hypothesis appears to be a decline in the breeding populations that supply migrants to the North Atlantic region, but a change in movements, for example passing through the region more quickly in recent years, cannot be excluded as an explanation. Further surveys of arctic breeding areas coupled with analysis of long‐term survey data from western North America would be helpful in determining whether the declines found in this analysis are also occurring in other areas.
","language":"English","publisher":"WIley","doi":"10.1111/j.2007.0908-8857.03698.x","usgsCitation":"Bart, J., Brown, S., Harrington, B.A., and Morrison, R., 2007, Survey trends of North American shorebirds: Population declines or shifting distributions?: Journal of Avian Biology, v. 38, no. 1, p. 73-82, https://doi.org/10.1111/j.2007.0908-8857.03698.x.","productDescription":"10 p.","startPage":"73","endPage":"82","costCenters":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"links":[{"id":242531,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"38","issue":"1","noUsgsAuthors":false,"publicationDate":"2007-01-25","publicationStatus":"PW","scienceBaseUri":"505ba2a0e4b08c986b31f839","contributors":{"authors":[{"text":"Bart, Jonathan jon_bart@usgs.gov","contributorId":57025,"corporation":false,"usgs":true,"family":"Bart","given":"Jonathan","email":"jon_bart@usgs.gov","affiliations":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"preferred":false,"id":434335,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Brown, Stephen","contributorId":40096,"corporation":false,"usgs":true,"family":"Brown","given":"Stephen","affiliations":[],"preferred":false,"id":434336,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Harrington, Brian A.","contributorId":58989,"corporation":false,"usgs":true,"family":"Harrington","given":"Brian","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":434333,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Morrison, R.I. Guy","contributorId":52003,"corporation":false,"usgs":true,"family":"Morrison","given":"R.I. Guy","affiliations":[],"preferred":false,"id":434334,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70030017,"text":"70030017 - 2007 - The colonial ascidian Didemnum sp. A: current distribution, basic biology and potential threat to marine communities of the northeast and west coasts of North America","interactions":[],"lastModifiedDate":"2017-10-04T14:41:43","indexId":"70030017","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2277,"text":"Journal of Experimental Marine Biology and Ecology","active":true,"publicationSubtype":{"id":10}},"displayTitle":"The colonial ascidian Didemnum sp. A: current distribution, basic biology and potential threat to marine communities of the northeast and west coasts of North America","title":"The colonial ascidian Didemnum sp. A: current distribution, basic biology and potential threat to marine communities of the northeast and west coasts of North America","docAbstract":"Didemnum sp. A is a colonial ascidian with rapidly expanding populations on the east and west coasts of North America. The origin of Didemum sp. A is unknown. Populations were first observed on the northeast coast of the U.S. in the late 1980s and on the west coast during the 1990s. It is currently undergoing a massive population explosion and is now a dominant member of many subtidal communities on both coasts. To determine Didemnum sp. A's current distribution, we conducted surveys from Maine to Virginia on the east coast and from British Columbia to southern California on the west coast of the U.S. between 1998 and 2005. In nearshore locations Didemnum sp. A currently ranges from Eastport, Maine to Shinnecock Bay, New York on the east coast. On the west coast it has been recorded from Humboldt Bay to Port San Luis in California, several sites in Puget Sound, Washington, including a heavily fouled mussel culture facility, and several sites in southwestern British Columbia on and adjacent to oyster and mussel farms. The species also occurs at deeper subtidal sites (up to 81 m) off New England, including Georges, Stellwagen and Tillies Banks. On Georges Bank numerous sites within a 230 km2 area are 50–90% covered by Didemnum sp. A; large colonies cement the pebble gravel into nearly solid mats that may smother infaunal organisms. These observations suggest that Didemnum sp. A has the potential to alter marine communities and affect economically important activities such as fishing and aquaculture.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.jembe.2006.10.020","issn":"00220981","usgsCitation":"Bullard, S., Lambert, G., Carman, M., Byrnes, J., Whitlatch, R., Ruiz, G., Miller, R.J., Harris, L., Valentine, P.C., Collie, J., Pederson, J., McNaught, D., Cohen, A., Asch, R.G., Dijkstra, J., and Heinonen, K., 2007, The colonial ascidian Didemnum sp. A: current distribution, basic biology and potential threat to marine communities of the northeast and west coasts of North America: Journal of Experimental Marine Biology and Ecology, v. 342, no. 1, p. 99-108, https://doi.org/10.1016/j.jembe.2006.10.020.","productDescription":"10 p.","startPage":"99","endPage":"108","costCenters":[{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true},{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":477099,"rank":1,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://digitalcommons.uri.edu/gsofacpubs/663","text":"External Repository"},{"id":240465,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Canada, United States","state":"British Columbia, California, Connecticut, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, 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J.","contributorId":34326,"corporation":false,"usgs":true,"family":"Byrnes","given":"J.","email":"","affiliations":[],"preferred":false,"id":425341,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Whitlatch, R.B.","contributorId":28023,"corporation":false,"usgs":true,"family":"Whitlatch","given":"R.B.","affiliations":[],"preferred":false,"id":425340,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Ruiz, G.","contributorId":88956,"corporation":false,"usgs":true,"family":"Ruiz","given":"G.","email":"","affiliations":[],"preferred":false,"id":425347,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Miller, R. J.","contributorId":9225,"corporation":false,"usgs":true,"family":"Miller","given":"R.","middleInitial":"J.","affiliations":[],"preferred":false,"id":425335,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Harris, L.","contributorId":23493,"corporation":false,"usgs":true,"family":"Harris","given":"L.","affiliations":[],"preferred":false,"id":425338,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Valentine, P. C.","contributorId":46505,"corporation":false,"usgs":true,"family":"Valentine","given":"P.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":425342,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Collie, J.S.","contributorId":102217,"corporation":false,"usgs":true,"family":"Collie","given":"J.S.","affiliations":[],"preferred":false,"id":425350,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Pederson, J.","contributorId":11413,"corporation":false,"usgs":true,"family":"Pederson","given":"J.","email":"","affiliations":[],"preferred":false,"id":425336,"contributorType":{"id":1,"text":"Authors"},"rank":11},{"text":"McNaught, D.C.","contributorId":92871,"corporation":false,"usgs":true,"family":"McNaught","given":"D.C.","email":"","affiliations":[],"preferred":false,"id":425348,"contributorType":{"id":1,"text":"Authors"},"rank":12},{"text":"Cohen, A.N.","contributorId":84544,"corporation":false,"usgs":true,"family":"Cohen","given":"A.N.","email":"","affiliations":[],"preferred":false,"id":425345,"contributorType":{"id":1,"text":"Authors"},"rank":13},{"text":"Asch, R. G.","contributorId":65289,"corporation":false,"usgs":false,"family":"Asch","given":"R.","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":425343,"contributorType":{"id":1,"text":"Authors"},"rank":14},{"text":"Dijkstra, J.","contributorId":86175,"corporation":false,"usgs":true,"family":"Dijkstra","given":"J.","email":"","affiliations":[],"preferred":false,"id":425346,"contributorType":{"id":1,"text":"Authors"},"rank":15},{"text":"Heinonen, K.","contributorId":98117,"corporation":false,"usgs":true,"family":"Heinonen","given":"K.","email":"","affiliations":[],"preferred":false,"id":425349,"contributorType":{"id":1,"text":"Authors"},"rank":16}]}} ,{"id":70180392,"text":"70180392 - 2007 - USGS national surveys and analysis projects: Preliminary compilation of integrated geological datasets for the United States: A section in Digital mapping techniques '06 - Workshop proceedings","interactions":[{"subject":{"id":70180392,"text":"70180392 - 2007 - USGS national surveys and analysis projects: Preliminary compilation of integrated geological datasets for the United States: A section in Digital mapping techniques '06 - Workshop proceedings","indexId":"70180392","publicationYear":"2007","noYear":false,"title":"USGS national surveys and analysis projects: Preliminary compilation of integrated geological datasets for the United States: A section in Digital mapping techniques '06 - Workshop proceedings"},"predicate":"IS_PART_OF","object":{"id":81245,"text":"ofr20071285 - 2007 - Digital mapping techniques '06 - Workshop proceedings","indexId":"ofr20071285","publicationYear":"2007","noYear":false,"title":"Digital mapping techniques '06 - Workshop proceedings"},"id":1}],"isPartOf":{"id":81245,"text":"ofr20071285 - 2007 - Digital mapping techniques '06 - Workshop proceedings","indexId":"ofr20071285","publicationYear":"2007","noYear":false,"title":"Digital mapping techniques '06 - Workshop proceedings"},"lastModifiedDate":"2017-01-30T08:30:56","indexId":"70180392","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1285","title":"USGS national surveys and analysis projects: Preliminary compilation of integrated geological datasets for the United States: A section in Digital mapping techniques '06 - Workshop proceedings","docAbstract":"The growth in the use of Geographic Information Systems (GIS) has highlighted the need for regional and national digital geologic maps attributed with age and rock type information. Such spatial data can be conveniently used to generate derivative maps for purposes that include mineral-resource assessment, metallogenic studies, tectonic studies, human health and environmental research.
In 1997, the United States Geological Survey’s Mineral Resources Program initiated an effort to develop national digital databases for use in mineral resource and environmental assessments. One primary activity of this effort was to compile a national digital geologic map database, utilizing state geologic maps, to support mineral resource studies in the range of 1:250,000- to 1:1,000,000-scale. Over the course of the past decade, state databases were prepared using a common standard for the database structure, fields, attributes, and data dictionaries. As of late 2006, standardized geological map databases for all conterminous (CONUS) states have been available on-line as USGS Open-File Reports. For Alaska and Hawaii, new state maps are being prepared, and the preliminary work for Alaska is being released as a series of 1:500,000-scale regional compilations. See below for a list of all published databases.
","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Digital mapping techniques '06 - Workshop proceedings (Open-File Report 2007-1285)","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"conferenceTitle":"Digital mapping techniques '06","conferenceDate":"June 11-14, 2006","conferenceLocation":"Columbus, OH","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/70180392","usgsCitation":"Nicholson, S.W., Stoeser, D.B., Wilson, F.H., Dicken, C., and Ludington, S., 2007, USGS national surveys and analysis projects: Preliminary compilation of integrated geological datasets for the United States: A section in Digital mapping techniques '06 - Workshop proceedings: U.S. Geological Survey Open-File Report 2007-1285, 5 p., https://doi.org/10.3133/70180392.","productDescription":"5 p.","startPage":"203","endPage":"207","numberOfPages":"7","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true},{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true},{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true},{"id":596,"text":"U.S. Geological Survey National Center","active":false,"usgs":true}],"links":[{"id":334260,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":334258,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/2007/1285/contents.html","text":"Index Page for Larger Work"},{"id":334259,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2007/1285/pdf/Nicholson.pdf"}],"country":"United States","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"588f0d73e4b072a7ac08c125","contributors":{"authors":[{"text":"Nicholson, Suzanne W. 0000-0002-9365-1894 swnich@usgs.gov","orcid":"https://orcid.org/0000-0002-9365-1894","contributorId":880,"corporation":false,"usgs":true,"family":"Nicholson","given":"Suzanne","email":"swnich@usgs.gov","middleInitial":"W.","affiliations":[],"preferred":true,"id":661511,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stoeser, Douglas B. dstoeser@usgs.gov","contributorId":1821,"corporation":false,"usgs":true,"family":"Stoeser","given":"Douglas","email":"dstoeser@usgs.gov","middleInitial":"B.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":661512,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wilson, Frederic H. 0000-0003-1761-6437 fwilson@usgs.gov","orcid":"https://orcid.org/0000-0003-1761-6437","contributorId":67174,"corporation":false,"usgs":true,"family":"Wilson","given":"Frederic","email":"fwilson@usgs.gov","middleInitial":"H.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true}],"preferred":true,"id":661513,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Dicken, Connie L. cdicken@usgs.gov","contributorId":4714,"corporation":false,"usgs":true,"family":"Dicken","given":"Connie L.","email":"cdicken@usgs.gov","affiliations":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":false,"id":661514,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Ludington, Stephen 0000-0002-6265-4996 slud@usgs.gov","orcid":"https://orcid.org/0000-0002-6265-4996","contributorId":172672,"corporation":false,"usgs":true,"family":"Ludington","given":"Stephen","email":"slud@usgs.gov","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":661515,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70033050,"text":"70033050 - 2007 - Solar forcing of Gulf of California climate during the past 2000 yr suggested by diatoms and silicoflagellates","interactions":[],"lastModifiedDate":"2023-10-06T11:57:48.507091","indexId":"70033050","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2673,"text":"Marine Micropaleontology","active":true,"publicationSubtype":{"id":10}},"title":"Solar forcing of Gulf of California climate during the past 2000 yr suggested by diatoms and silicoflagellates","docAbstract":"High-resolution records of the past 2000 yr are compared in a north–south transect (28° N to 24° N) of three cores from the eastern slopes of the Guaymas, Carmen, and Pescadero Basins of the Gulf of California (hereafter referred to as the “Gulf”). Evenly-spaced samples from the varved sediments in each core allow sample resolution ranging from ∼ 16 to ∼ 37 yr.
Diatoms and silicoflagellates capture the seasonal variation between a late fall to early spring period of high biosiliceous productivity, that is driven by northwest winds, and a summer period of warmer, more stratified waters during which these winds slacken and/or reverse direction (monsoonal flow). As these winds decrease, tropical waters enter the Gulf and spread northward. Individual samples represent a composite of 7 to 23 yr of deposition and are assumed to record the relative dominance of the winter vs. summer floral components.
Intervals of enhanced summer incursion of tropical waters, alternating with periods of increased late fall to early spring biosiliceous productivity are recorded in all three cores. Regularly spaced cycles (∼ 100 yr duration) of Octactis pulchra, a silicoflagellate proxy for lower SST and high productivity, and Azpeitia nodulifera, a tropical diatom, occur between ∼ A.D. 400 and ∼ 1700 in the more nearshore Carmen Basin core, NH01-21 (26.3° N), suggesting a possible solar influence on coastal upwelling.
Cores BAM80 E-17 (27.9° N) and NH01-26 (24.3° N) contain longer-duration cycles of diatoms and silicoflagellates. The early part of Medieval Climate Anomaly (∼ A.D. 900 to 1200) is characterized by two periods of reduced productivity (warmer SST) with an intervening high productivity (cool) interval centered at ∼ A.D. 1050. Reduced productivity and higher SST also characterize the record of the last ∼ 100 to 200 yr in these cores. Solar variability appears to be driving productivity cycles, as intervals of increased radiocarbon production (sunspot minima) correlate with intervals of enhanced productivity. It is proposed that increased winter cooling of the atmosphere above southwest U.S. during sunspot minima causes intensification of the northwest winds that blow down the Gulf during the late fall to early spring, leading to intensified overturn of surface waters and enhanced productivity.
A new silicoflagellate species, Dictyocha franshepardii Bukry, is described and illustrated.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.marmicro.2006.08.003","issn":"03778398","usgsCitation":"Barron, J.A., and Bukry, D., 2007, Solar forcing of Gulf of California climate during the past 2000 yr suggested by diatoms and silicoflagellates: Marine Micropaleontology, v. 62, no. 2, p. 115-139, https://doi.org/10.1016/j.marmicro.2006.08.003.","productDescription":"25 p.","startPage":"115","endPage":"139","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":240713,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States, Mexico","state":"California","otherGeospatial":"Gulf of California","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -107.40234375,\n 24.287026865376436\n ],\n [\n -109.00634765625,\n 25.58208527870072\n ],\n [\n -109.48974609375,\n 25.819671943904044\n ],\n [\n -109.22607421875,\n 26.27371402440643\n ],\n [\n -109.4677734375,\n 26.686729520004036\n ],\n [\n -109.8193359375,\n 26.745610382199022\n ],\n [\n -109.9951171875,\n 27.00040800352175\n ],\n [\n -110.63232421875,\n 27.332735136859146\n ],\n [\n -110.5224609375,\n 27.800209937418252\n ],\n [\n -110.9619140625,\n 27.89734922968426\n ],\n [\n -111.42333984375,\n 28.22697003891834\n ],\n [\n -112.12646484375,\n 28.806173508854776\n ],\n [\n -112.4560546875,\n 29.49698759653577\n ],\n [\n -113.0712890625,\n 30.600093873550072\n ],\n [\n -113.09326171875,\n 31.203404950917395\n ],\n [\n -113.75244140624999,\n 31.541089879585808\n ],\n [\n -114.169921875,\n 31.484893386890164\n ],\n [\n -114.7412109375,\n 31.690781806136822\n ],\n [\n -114.873046875,\n 31.052933985705163\n ],\n [\n -114.67529296874999,\n 30.44867367928756\n ],\n [\n -114.6533203125,\n 29.954934549656144\n ],\n [\n -114.0380859375,\n 29.53522956294847\n ],\n [\n -113.02734374999999,\n 28.51696944040106\n ],\n [\n -112.69775390625,\n 27.68352808378776\n ],\n [\n -112.2802734375,\n 27.332735136859146\n ],\n [\n -111.884765625,\n 26.88288045572338\n ],\n [\n -111.33544921874999,\n 26.37218544169559\n ],\n [\n -111.3134765625,\n 25.819671943904044\n ],\n [\n -110.72021484375,\n 24.84656534821976\n ],\n [\n -110.654296875,\n 24.246964554300924\n ],\n [\n -110.23681640625,\n 24.347096633808512\n ],\n [\n -109.70947265625,\n 23.725011735951796\n ],\n [\n -109.2919921875,\n 23.28171917560002\n ],\n [\n -107.40234375,\n 24.287026865376436\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"62","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9235e4b08c986b319d7a","contributors":{"authors":[{"text":"Barron, John A. 0000-0002-9309-1145 jbarron@usgs.gov","orcid":"https://orcid.org/0000-0002-9309-1145","contributorId":2222,"corporation":false,"usgs":true,"family":"Barron","given":"John","email":"jbarron@usgs.gov","middleInitial":"A.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":439129,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bukry, David 0000-0003-4540-890X","orcid":"https://orcid.org/0000-0003-4540-890X","contributorId":30980,"corporation":false,"usgs":true,"family":"Bukry","given":"David","affiliations":[],"preferred":false,"id":439128,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70030065,"text":"70030065 - 2007 - Sea level fluctuations in central California at subtidal to decadal and longer time scales with implications for San Francisco Bay, California","interactions":[],"lastModifiedDate":"2023-08-02T12:16:40.648602","indexId":"70030065","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1587,"text":"Estuarine, Coastal and Shelf Science","active":true,"publicationSubtype":{"id":10}},"title":"Sea level fluctuations in central California at subtidal to decadal and longer time scales with implications for San Francisco Bay, California","docAbstract":"Sea level elevations from near the mouth of San Francisco Bay are used to describe the low-frequency variability of forcing of the coastal ocean on the Bay at a variety of temporal scales. About 90% of subtidal fluctuations in sea level in San Francisco Bay are driven by the sea level variations in the coastal ocean that propagate into the Bay at the estuary mouth. We use the 100-year sea level record available at San Francisco to document a 1.9 mm/yr mean sea level rise, and to determine fluctuations related to El Nino-Southern Oscillation (ENSO) and other climatic events. At time scales greater than 1 year, ENSO dominates the sea level signal and can result in fluctuations in sea level of 10–15 cm. Alongshore wind stress data from central California are also analyzed to determine the impact of changes in coastal elevation at the mouth of San Francisco Bay within the synoptic wind band of 2–30 days. At least 40% of the subtidal fluctuations in sea level of the Bay are tied to the large-scale regional wind field affecting sea level variations in the coastal ocean, with little local, direct wind forcing of the Bay itself. The majority of the subtidal sea level fluctuations within the Bay that are not related to the coastal ocean sea level signal are forced by an east–west sea level gradient resulting from tidally induced variations in sea level at specific beat frequencies that are enhanced in the northern reach of the Bay. River discharge into the Bay through the Sacramento and San Joaquin River Delta also contributes to the east–west gradient, but to a lesser degree.
Advanced borehole-geophysical methods were used to assess the geohydrology of fractured crystalline bedrock in 31 of 64 boreholes on the southern part of Manhattan Island, NY in preparation of the construction of a new water tunnel. The study area is located in a highly urbanized part of New York City. The boreholes penetrated gneiss, schist, and other crystalline bedrock that has an overall southwest-to northwest-dipping foliation. Most of the fractures intersected are nearly horizontal or have moderate- to high-angle northwest or eastward dip azimuths. Heat-pulse flowmeter logs obtained under nonpumping (ambient) and pumping conditions, together with other geophysical logs, delineated transmissive fracture zones in each borehole. Water-level and flowmeter data suggest the fractured-rock ground-water-flow system is interconnected. The 60 MHz directional borehole-radar logs delineated the location and orientation of several radar reflectors that did not intersect the projection of the borehole. A total of 53 faults intersected by the boreholes have mean orientation populations of N12°W, 66°W and N11°W, 70°E. A total of 77 transmissive fractures delineated using the heat-pulse flowmeter have mean orientations of N11°E, 14°SE (majority) and N23°E, 57°NW (minority). The transmissivity of the bedrock boreholes ranged from 0.7 to 870 feet squared (ft2) per day (0.07 to 81 metres squared (m2) per day).
","language":"English","publisher":"Oxford Academic","doi":"10.1088/1742-2132/4/3/S02","issn":"17422132","usgsCitation":"Stumm, F., Chu, A., Joesten, P., and Lane, J., 2007, Geohydrologic assessment of fractured crystalline bedrock on the southern part of Manhattan, New York, through the use of advanced borehole geophysical methods: Journal of Geophysics and Engineering, v. 4, no. 3, p. 245-252, https://doi.org/10.1088/1742-2132/4/3/S02.","productDescription":"8 p.","startPage":"245","endPage":"252","numberOfPages":"8","costCenters":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true}],"links":[{"id":240627,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"New York","city":"Manhattan","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -74.02450561523438,\n 40.69938133866613\n ],\n [\n -73.93386840820312,\n 40.69938133866613\n ],\n [\n -73.93386840820312,\n 40.79977641109269\n ],\n [\n -74.02450561523438,\n 40.79977641109269\n ],\n [\n -74.02450561523438,\n 40.69938133866613\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"4","issue":"3","noUsgsAuthors":false,"publicationDate":"2007-08-31","publicationStatus":"PW","scienceBaseUri":"505a17a0e4b0c8380cd55578","contributors":{"authors":[{"text":"Stumm, F.","contributorId":33928,"corporation":false,"usgs":true,"family":"Stumm","given":"F.","email":"","affiliations":[],"preferred":false,"id":425382,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Chu, A.","contributorId":81697,"corporation":false,"usgs":true,"family":"Chu","given":"A.","email":"","affiliations":[],"preferred":false,"id":425385,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Joesten, P. K.","contributorId":62818,"corporation":false,"usgs":true,"family":"Joesten","given":"P. K.","affiliations":[],"preferred":false,"id":425383,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Lane, J.W. Jr.","contributorId":66723,"corporation":false,"usgs":true,"family":"Lane","given":"J.W.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":425384,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029892,"text":"70029892 - 2007 - Free zinc ion and dissolved orthophosphate effects on phytoplankton from Coeur d'Alene Lake, Idaho","interactions":[],"lastModifiedDate":"2023-08-25T12:07:25.166789","indexId":"70029892","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Free zinc ion and dissolved orthophosphate effects on phytoplankton from Coeur d'Alene Lake, Idaho","docAbstract":"Coeur d'Alene Lake in northern Idaho is fed by two major rivers: the Coeur d'Alene River from the east and the St. Joe River from the south, with the Spokane River as its outlet to the north. This phosphorus-limited lake has been subjected to decades of mining (primarily for zinc and silver) and other anthropogenic inputs. A 32 full-factorial experimental design was used to examine the interactive effects of free (uncomplexed) zinc ion and dissolved-orthophosphate concentrations on phytoplankton that were isolated from two sites along a longitudinal zinc-concentration gradient in Coeur d'Alene Lake. The two sites displayed different dominant taxa. Chlorella minutissima, a dominant species near the southern St. Joe River inlet, exhibited greater sensitivity to free Zn ions than Asterionella formosa, collected nearer the Coeur d'Alene River mouth with elevated dissolved-zinc concentrations. Empirical phytoplankton-response models were generated to describe phytoplankton growth in response to remediation strategies in the surrounding watershed. If dissolved Zn can be reduced in the water column from >500 nM (i.e., current concentrations near and down stream of the Coeur d'Alene River plume) to <3 nM (i.e., concentrations near the southern St. Joe River inlet) such that the lake is truly phosphorus limited, management of phosphorus inputs by surrounding communities will ultimately determine the limnologic state of the lake.
","language":"English","publisher":"American Chemical Society","doi":"10.1021/es062923l","issn":"0013936X","usgsCitation":"Kuwabara, J.S., Topping, B.R., Woods, P.F., and Carter, J.L., 2007, Free zinc ion and dissolved orthophosphate effects on phytoplankton from Coeur d'Alene Lake, Idaho: Environmental Science & Technology, v. 41, no. 8, p. 2811-2817, https://doi.org/10.1021/es062923l.","productDescription":"7 p.","startPage":"2811","endPage":"2817","numberOfPages":"7","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240650,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Idaho","otherGeospatial":"Coeur d'Alene Lake","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -116.81625366210938,\n 47.68018294648414\n ],\n [\n -116.707763671875,\n 47.66538735632654\n ],\n [\n -116.64596557617188,\n 47.635783590864854\n ],\n [\n -116.64321899414062,\n 47.61079236060622\n ],\n [\n -116.7572021484375,\n 47.61264397257417\n ],\n [\n -116.7681884765625,\n 47.57652571374621\n ],\n [\n -116.75170898437501,\n 47.54038252373696\n ],\n [\n -116.8231201171875,\n 47.484728927366504\n ],\n [\n -116.77780151367186,\n 47.4828727909934\n ],\n [\n -116.75857543945312,\n 47.4828727909934\n ],\n [\n -116.75445556640625,\n 47.45223707184017\n ],\n [\n -116.70639038085938,\n 47.40764414848437\n ],\n [\n -116.67892456054688,\n 47.35836223484991\n ],\n [\n -116.69540405273438,\n 47.33789206010502\n ],\n [\n -116.77230834960938,\n 47.34905859411952\n ],\n [\n -116.78741455078125,\n 47.37975438400816\n ],\n [\n -116.79153442382812,\n 47.41322033016902\n ],\n [\n -116.88079833984375,\n 47.462450962249356\n ],\n [\n -116.94671630859375,\n 47.45687999525879\n ],\n [\n -116.94259643554688,\n 47.47823216312885\n ],\n [\n -116.90826416015625,\n 47.51349065484327\n ],\n [\n -116.87667846679689,\n 47.516273211681984\n ],\n [\n -116.82861328125001,\n 47.58486290927609\n ],\n [\n -116.8780517578125,\n 47.592272635166125\n ],\n [\n -116.8780517578125,\n 47.61264397257417\n ],\n [\n -116.83135986328125,\n 47.61819841513311\n ],\n [\n -116.80938720703124,\n 47.62190104905555\n ],\n [\n -116.82861328125001,\n 47.65613798222679\n ],\n [\n -116.83959960937499,\n 47.67186094318796\n ],\n [\n -116.81625366210938,\n 47.68018294648414\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"41","issue":"8","noUsgsAuthors":false,"publicationDate":"2007-03-09","publicationStatus":"PW","scienceBaseUri":"505a13c1e4b0c8380cd54782","contributors":{"authors":[{"text":"Kuwabara, James S. 0000-0003-2502-1601 kuwabara@usgs.gov","orcid":"https://orcid.org/0000-0003-2502-1601","contributorId":3374,"corporation":false,"usgs":true,"family":"Kuwabara","given":"James","email":"kuwabara@usgs.gov","middleInitial":"S.","affiliations":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"preferred":true,"id":424758,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Topping, Brent R. 0000-0002-7887-4221 btopping@usgs.gov","orcid":"https://orcid.org/0000-0002-7887-4221","contributorId":1484,"corporation":false,"usgs":true,"family":"Topping","given":"Brent","email":"btopping@usgs.gov","middleInitial":"R.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":424760,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Woods, Paul F.","contributorId":82273,"corporation":false,"usgs":true,"family":"Woods","given":"Paul","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":424759,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Carter, James L. 0000-0002-0104-9776 jlcarter@usgs.gov","orcid":"https://orcid.org/0000-0002-0104-9776","contributorId":3278,"corporation":false,"usgs":true,"family":"Carter","given":"James","email":"jlcarter@usgs.gov","middleInitial":"L.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":424757,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029869,"text":"70029869 - 2007 - Fault locking, block rotation and crustal deformation in the Pacific Northwest","interactions":[],"lastModifiedDate":"2023-08-08T11:15:21.252841","indexId":"70029869","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1803,"text":"Geophysical Journal International","active":true,"publicationSubtype":{"id":10}},"title":"Fault locking, block rotation and crustal deformation in the Pacific Northwest","docAbstract":"We interpret Global Positioning System (GPS) measurements in the northwestern United States and adjacent parts of western Canada to describe relative motions of crustal blocks, locking on faults and permanent deformation associated with convergence between the Juan de Fuca and North American plates. To estimate angular velocities of the oceanic Juan de Fuca and Explorer plates and several continental crustal blocks, we invert the GPS velocities together with seafloor spreading rates, earthquake slip vector azimuths and fault slip azimuths and rates. We also determine the degree to which faults are either creeping aseismically or, alternatively, locked on the block-bounding faults. The Cascadia subduction thrust is locked mainly offshore, except in central Oregon, where locking extends inland. Most of Oregon and southwest Washington rotate clockwise relative to North America at rates of 0.4–1.0 ° Myr−1. No shear or extension along the Cascades volcanic arc has occurred at the mm/yr level during the past decade, suggesting that the shear deformation extending northward from the Walker Lane and eastern California shear zone south of Oregon is largely accommodated by block rotation in Oregon. The general agreement of vertical axis rotation rates derived from GPS velocities with those estimated from palaeomagnetic declination anomalies suggests that the rotations have been relatively steady for 10–15 Ma. Additional permanent dextral shear is indicated within the Oregon Coast Range near the coast. Block rotations in the Pacific Northwest do not result in net westward flux of crustal material—the crust is simply spinning and not escaping. On Vancouver Island, where the convergence obliquity is less than in Oregon and Washington, the contractional strain at the coast is more aligned with Juan de Fuca—North America motion. GPS velocities are fit significantly better when Vancouver Island and the southern Coast Mountains move relative to North America in a block-like fashion. The relative motions of the Oregon, western Washington and Vancouver Island crustal blocks indicate that the rate of permanent shortening, the type that causes upper plate earthquakes, across the Puget Sound region is 4.4 ± 0.3 mm yr−1. This shortening is likely distributed over several faults but GPS data alone cannot determine the partitioning of slip on them. The transition from predominantly shear deformation within the continent south of the Mendocino Triple Junction to predominantly block rotations north of it is similar to changes in tectonic style at other transitions from shear to subduction. This similarity suggests that crustal block rotations are enhanced in the vicinity of subduction zones possibly due to lower resisting stress.
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To date, more than 750,000 responses have been compiled in the United States alone. The DYFI data make up in quantity what they may lack in scientific quality and offer the potential to resolve longstanding issues in earthquake ground-motion science. Such issues have been difficult to address due to the paucity of instrumental ground-motion data in regions of low seismicity. In particular, DYFI data provide strong evidence that earthquake stress drops, which control the strength of high-frequency ground shaking, are higher in the central and eastern United States (CEUS) than in California. Higher earthquake stress drops, coupled with lower attenuation of shaking with distance, result in stronger overall shaking over a wider area and thus more potential damage for CEUS earthquakes in comparison to those of equal magnitude in California - a fact also definitively captured with these new DYFI data and maps.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Seismological Research Letters","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1785/gssrl.78.3.362","issn":"08950695","usgsCitation":"Atkinson, G.M., and Wald, D., 2007, \"Did you feel it?\" Intensity data: A surprisingly good measure of earthquake ground motion: Seismological Research Letters, v. 78, no. 3, p. 362-368, https://doi.org/10.1785/gssrl.78.3.362.","startPage":"362","endPage":"368","numberOfPages":"7","costCenters":[],"links":[{"id":240614,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213034,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1785/gssrl.78.3.362"}],"volume":"78","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"56978339e4b039675d00a6ce","contributors":{"authors":[{"text":"Atkinson, G. 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On Kīlauea volcano, a transition from minor to broad-scale summit inflation was observed by interferograms that span 2003 to 2006. In addition, radar interferometry (InSAR) observations of Kīlauea led to the discovery of several previously unknown areas of localized subsidence in the caldera and along the volcano’s east rift zone. These features are probably caused by the cooling and contraction of accumulated lavas. After November 2005, a surface instability near the point that lava entered the ocean on the south flank of Kīlauea was observed in interferograms. The motion is most likely a result of unbuttressing of a portion of the coast following the collapse of a large lava delta in November 2005. InSAR data can also be used to map lava flow development over time, providing ~30 m spatial resolution maps at approximately monthly intervals. Future applications of InSAR to Kīlauea will probably result in more discoveries and insights, both as the style of volcano deformation changes and as data from new instruments are acquired.
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\"}}]}","issue":"SP-636","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e636e4b0c8380cd47258","contributors":{"authors":[{"text":"Poland, Michael P. 0000-0001-5240-6123 mpoland@usgs.gov","orcid":"https://orcid.org/0000-0001-5240-6123","contributorId":146118,"corporation":false,"usgs":true,"family":"Poland","given":"Michael","email":"mpoland@usgs.gov","middleInitial":"P.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":424079,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70030190,"text":"70030190 - 2007 - Seismic velocity structure and seismotectonics of the eastern San Francisco Bay region, California","interactions":[],"lastModifiedDate":"2023-08-10T11:08:16.364304","indexId":"70030190","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1135,"text":"Bulletin of the Seismological Society of America","onlineIssn":"1943-3573","printIssn":"0037-1106","active":true,"publicationSubtype":{"id":10}},"title":"Seismic velocity structure and seismotectonics of the eastern San Francisco Bay region, California","docAbstract":"The Hayward Fault System is considered the most likely fault system in the San Francisco Bay Area, California, to produce a major earthquake in the next 30 years. To better understand this fault system, we use microseismicity to study its structure and kinematics. We present a new 3D seismic-velocity model for the eastern San Francisco Bay region, using microseismicity and controlled sources, which reveals a ∼10% velocity contrast across the Hayward fault in the upper 10 km, with higher velocity in the Franciscan Complex to the west relative to the Great Valley Sequence to the east. This contrast is imaged more sharply in our localized model than in previous regional-scale models. Thick Cenozoic sedimentary basins, such as the Livermore basin, which may experience particularly strong shaking during an earthquake, are imaged in the model.
","language":"English","publisher":"Seismological Society of America","doi":"10.1785/0120060032","issn":"00371106","usgsCitation":"Hardebeck, J., Michael, A., and Brocher, T., 2007, Seismic velocity structure and seismotectonics of the eastern San Francisco Bay region, California: Bulletin of the Seismological Society of America, v. 97, no. 3, p. 826-842, https://doi.org/10.1785/0120060032.","productDescription":"17 p.","startPage":"826","endPage":"842","costCenters":[],"links":[{"id":239502,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"San Francisco Bay area","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -123.09890285663033,\n 38.418772287805865\n ],\n [\n -123.09890285663033,\n 37.186710878757324\n ],\n [\n -121.47362362473098,\n 37.186710878757324\n ],\n [\n -121.47362362473098,\n 38.418772287805865\n ],\n [\n -123.09890285663033,\n 38.418772287805865\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"97","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8b76e4b08c986b317850","contributors":{"authors":[{"text":"Hardebeck, J.L.","contributorId":98862,"corporation":false,"usgs":true,"family":"Hardebeck","given":"J.L.","email":"","affiliations":[],"preferred":false,"id":426070,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Michael, A.J. 0000-0002-2403-5019","orcid":"https://orcid.org/0000-0002-2403-5019","contributorId":52192,"corporation":false,"usgs":true,"family":"Michael","given":"A.J.","affiliations":[],"preferred":false,"id":426068,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Brocher, T.M. 0000-0002-9740-839X","orcid":"https://orcid.org/0000-0002-9740-839X","contributorId":69994,"corporation":false,"usgs":true,"family":"Brocher","given":"T.M.","affiliations":[],"preferred":false,"id":426069,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":79979,"text":"pp1732D - 2007 - Estimating the amount of eroded section in a partially exhumed basin from geophysical well logs: An example from the North Slope","interactions":[{"subject":{"id":79979,"text":"pp1732D - 2007 - Estimating the amount of eroded section in a partially exhumed basin from geophysical well logs: An example from the North Slope","indexId":"pp1732D","publicationYear":"2007","noYear":false,"chapter":"D","title":"Estimating the amount of eroded section in a partially exhumed basin from geophysical well logs: An example from the North Slope"},"predicate":"IS_PART_OF","object":{"id":79483,"text":"pp1732 - 2006 - Studies by the U.S. Geological Survey in Alaska, 2005","indexId":"pp1732","publicationYear":"2006","noYear":false,"title":"Studies by the U.S. Geological Survey in Alaska, 2005"},"id":1}],"isPartOf":{"id":79483,"text":"pp1732 - 2006 - Studies by the U.S. Geological Survey in Alaska, 2005","indexId":"pp1732","publicationYear":"2006","noYear":false,"title":"Studies by the U.S. Geological Survey in Alaska, 2005"},"lastModifiedDate":"2023-11-09T15:20:59.351701","indexId":"pp1732D","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":331,"text":"Professional Paper","code":"PP","onlineIssn":"2330-7102","printIssn":"1044-9612","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"1732","chapter":"D","title":"Estimating the amount of eroded section in a partially exhumed basin from geophysical well logs: An example from the North Slope","docAbstract":"The reconstruction of burial and thermal histories of partially exhumed basins requires an estimation of the amount of erosion that has occurred since the time of maximum burial. We have developed a method for estimating eroded thickness by using porosity-depth trends derived from borehole sonic logs of wells in the Colville Basin of northern Alaska. Porosity-depth functions defined from sonic-porosity logs in wells drilled in minimally eroded parts of the basin provide a baseline for comparison with the porosity-depth trends observed in other wells across the basin. Calculated porosities, based on porosity-depth functions, were fitted to the observed data in each well by varying the amount of section assumed to have been eroded from the top of the sedimentary column. The result is an estimate of denudation at the wellsite since the time of maximum sediment accumulation. Alternative methods of estimating exhumation include fission-track analysis and projection of trendlines through vitrinite-reflectance profiles. In the Colville Basin, the methodology described here provides results generally similar to those from fission-track analysis and vitrinite-reflectance profiles, but with greatly improved spatial resolution relative to the published fission-track data and with improved reliability relative to the vitrinite-reflectance data. In addition, the exhumation estimates derived from sonic-porosity logs are independent of the thermal evolution of the basin, allowing these estimates to be used as independent variables in thermal-history modeling.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Studies by the U.S. Geological Survey in Alaska, 2005 (Professional Paper 1732)","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/pp1732D","usgsCitation":"Burns, W.M., Hayba, D.O., Rowan, E.L., and Houseknecht, D.W., 2007, Estimating the amount of eroded section in a partially exhumed basin from geophysical well logs: An example from the North Slope: U.S. Geological Survey Professional Paper 1732, 18 p., https://doi.org/10.3133/pp1732D.","productDescription":"18 p.","onlineOnly":"Y","temporalStart":"2005-01-01","temporalEnd":"2005-12-31","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"links":[{"id":191970,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":415479,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_81295.htm","linkFileType":{"id":5,"text":"html"}},{"id":9706,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/pp/pp1732/pp1732d/","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Alaska","otherGeospatial":"North Slope","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -166,\n 71.5\n ],\n [\n -166,\n 68.5\n ],\n [\n -145.5,\n 68.5\n ],\n [\n -145.5,\n 71.5\n ],\n [\n -166,\n 71.5\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae2e4b07f02db688bd0","contributors":{"authors":[{"text":"Burns, W. Matthew","contributorId":56742,"corporation":false,"usgs":true,"family":"Burns","given":"W.","email":"","middleInitial":"Matthew","affiliations":[],"preferred":false,"id":291360,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hayba, Daniel O. 0000-0003-4092-1894 dhayba@usgs.gov","orcid":"https://orcid.org/0000-0003-4092-1894","contributorId":396,"corporation":false,"usgs":true,"family":"Hayba","given":"Daniel","email":"dhayba@usgs.gov","middleInitial":"O.","affiliations":[],"preferred":true,"id":291357,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rowan, Elisabeth L. 0000-0001-5753-6189 erowan@usgs.gov","orcid":"https://orcid.org/0000-0001-5753-6189","contributorId":2075,"corporation":false,"usgs":true,"family":"Rowan","given":"Elisabeth","email":"erowan@usgs.gov","middleInitial":"L.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":291359,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Houseknecht, David W. 0000-0002-9633-6910 dhouse@usgs.gov","orcid":"https://orcid.org/0000-0002-9633-6910","contributorId":645,"corporation":false,"usgs":true,"family":"Houseknecht","given":"David","email":"dhouse@usgs.gov","middleInitial":"W.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":291358,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70030719,"text":"70030719 - 2007 - Passive aerobic treatment of net-alkaline, iron-laden drainage from a flooded underground anthracite mine, Pennsylvania, USA","interactions":[],"lastModifiedDate":"2012-03-12T17:21:10","indexId":"70030719","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2745,"text":"Mine Water and the Environment","active":true,"publicationSubtype":{"id":10}},"title":"Passive aerobic treatment of net-alkaline, iron-laden drainage from a flooded underground anthracite mine, Pennsylvania, USA","docAbstract":"This report evaluates the results of a continuous 4.5-day laboratory aeration experiment and the first year of passive, aerobic treatment of abandoned mine drainage (AMD) from a typical flooded underground anthracite mine in eastern Pennsylvania, USA. During 1991-2006, the AMD source, locally known as the Otto Discharge, had flows from 20 to 270 L/s (median 92 L/s) and water quality that was consistently suboxic (median 0.9 mg/L O2) and circumneutral (pH ??? 6.0; net alkalinity >10) with moderate concentrations of dissolved iron and manganese and low concentrations of dissolved aluminum (medians of 11, 2.2, and <0.2 mg/L, respectively). In 2001, the laboratory aeration experiment demonstrated rapid oxidation of ferrous iron (Fe 2+) without supplemental alkalinity; the initial Fe2+ concentration of 16.4 mg/L decreased to less than 0.5 mg/L within 24 h; pH values increased rapidly from 5.8 to 7.2, ultimately attaining a steady-state value of 7.5. The increased pH coincided with a rapid decrease in the partial pressure of carbon dioxide (PCO2) from an initial value of 10 -1.1atm to a steady-state value of 10-3.1atm. From these results, a staged aerobic treatment system was conceptualized consisting of a 2 m deep pond with innovative aeration and recirculation to promote rapid oxidation of Fe2+, two 0.3 m deep wetlands to facilitate iron solids removal, and a supplemental oxic limestone drain for dissolved manganese and trace-metal removal. The system was constructed, but without the aeration mechanism, and began operation in June 2005. During the first 12 months of operation, estimated detention times in the treatment system ranged from 9 to 38 h. However, in contrast with 80-100% removal of Fe2+ over similar elapsed times during the laboratory aeration experiment, the treatment system typically removed less than 35% of the influent Fe2+. Although concentrations of dissolved CO2 decreased progressively within the treatment system, the PCO2 values for treated effluent remained elevated (10-2.4 to 10-1.7atm). The elevated PCO 2 maintained the pH within the system at values less than 7 and hence slowed the rate of Fe2+ oxidation compared to the aeration experiment. Kinetic models of Fe2+ oxidation that consider effects of pH and dissolved O2 were incorporated in the geochemical computer program PHREEQC to evaluate the effects of detention time, pH, and other variables on Fe2+ oxidation and removal rates. These models and the laboratory aeration experiment indicate that performance of this and other aerobic wetlands for treatment of net-alkaline AMD could be improved by aggressive, continuous aeration in the initial stage to decrease PCO 2, increase pH, and accelerate Fe2+ oxidation. ?? 2007 Springer-Verlag.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Mine Water and the Environment","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10230-007-0002-8","issn":"10259112","usgsCitation":"Cravotta, C., 2007, Passive aerobic treatment of net-alkaline, iron-laden drainage from a flooded underground anthracite mine, Pennsylvania, USA: Mine Water and the Environment, v. 26, no. 3, p. 128-149, https://doi.org/10.1007/s10230-007-0002-8.","startPage":"128","endPage":"149","numberOfPages":"22","costCenters":[],"links":[{"id":212138,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10230-007-0002-8"},{"id":239574,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"26","issue":"3","noUsgsAuthors":false,"publicationDate":"2007-08-18","publicationStatus":"PW","scienceBaseUri":"505a7576e4b0c8380cd77b70","contributors":{"authors":[{"text":"Cravotta, C.A. III","contributorId":18405,"corporation":false,"usgs":true,"family":"Cravotta","given":"C.A.","suffix":"III","email":"","affiliations":[],"preferred":false,"id":428378,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70030722,"text":"70030722 - 2007 - Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee","interactions":[],"lastModifiedDate":"2021-06-16T16:12:18.024251","indexId":"70030722","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3814,"text":"Zootaxa","onlineIssn":"1175-5334","printIssn":"1175-5326","active":true,"publicationSubtype":{"id":10}},"title":"Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee","docAbstract":"Three new species of Percina are described from upland drainages of the Mobile Basin. Two of the three species are narrowly distributed: P. kusha, the Bridled Darter, is currently known only from the Conasauga River drainage in Georgia and Tennessee and Etowah River drainage in Georgia, both tributaries of the Coosa River, and P. sipsi, the Bankhead Darter, which is restricted to tributaries of Sipsey Fork of the Black Warrior River in northwestern Alabama. The third species, P. smithvanizi, the Muscadine Darter, occurs above the Fall Line in the Tallapoosa River drainage in eastern Alabama and western Georgia. In a molecular analysis using mitochondrial cytochrome b sequence data, P. kusha and P. smithvanizi were recovered as sister species, while Percina sipsi was recovered in a clade consisting of P. aurolineata (P. sciera + P. sipsi). Two of the three species, P. kusha and P. sipsi, are considered to be imperiled species and are in need of conservation actions to prevent their extinction. Description of these three darters increases the number of described species of Percina to 44. Sixteen are known to occur in the Mobile Basin, including nine that are endemic.
","language":"English","publisher":"Magnolia Press","doi":"10.11646/zootaxa.1549.1.1","usgsCitation":"Williams, J., Neely, D., Walsh, S., and Burkhead, N., 2007, Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee: Zootaxa, no. 1549, p. 1-28, https://doi.org/10.11646/zootaxa.1549.1.1.","productDescription":"28 p.","startPage":"1","endPage":"28","costCenters":[{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":239609,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alabama, Georgia, Tennessee","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -90.04394531249999,\n 35.567980458012094\n ],\n [\n -90.4833984375,\n 34.70549341022544\n ],\n [\n -89.82421875,\n 34.77771580360469\n ],\n [\n -89.1650390625,\n 34.77771580360469\n ],\n [\n -88.1982421875,\n 34.77771580360469\n ],\n [\n -88.41796875,\n 30.372875188118016\n ],\n [\n -85.8251953125,\n 30.637912028341123\n ],\n [\n -81.123046875,\n 30.486550842588485\n ],\n [\n -80.8154296875,\n 32.32427558887655\n ],\n [\n -82.177734375,\n 33.90689555128866\n ],\n [\n -83.3642578125,\n 35.31736632923788\n ],\n [\n -81.0791015625,\n 36.66841891894786\n ],\n [\n -89.20898437499999,\n 36.421282443649496\n ],\n [\n -90.04394531249999,\n 35.567980458012094\n ]\n ]\n ]\n }\n }\n ]\n}","issue":"1549","edition":"1","noUsgsAuthors":false,"publicationDate":"2007-08-15","publicationStatus":"PW","scienceBaseUri":"505bb311e4b08c986b325b71","contributors":{"authors":[{"text":"Williams, J.D.","contributorId":74701,"corporation":false,"usgs":true,"family":"Williams","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":428392,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Neely, D.A.","contributorId":103083,"corporation":false,"usgs":true,"family":"Neely","given":"D.A.","email":"","affiliations":[],"preferred":false,"id":428393,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Walsh, S. J. 0000-0002-1009-8537","orcid":"https://orcid.org/0000-0002-1009-8537","contributorId":62171,"corporation":false,"usgs":true,"family":"Walsh","given":"S. J.","affiliations":[],"preferred":false,"id":428391,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Burkhead, N.M.","contributorId":34456,"corporation":false,"usgs":true,"family":"Burkhead","given":"N.M.","affiliations":[],"preferred":false,"id":428390,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70030776,"text":"70030776 - 2007 - Diverse dinosaur-dominated ichnofaunas from the Potomac Group (Lower Cretaceous) Maryland","interactions":[],"lastModifiedDate":"2018-03-06T14:51:51","indexId":"70030776","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1965,"text":"Ichnos: An International Journal for Plant and Animal Traces","onlineIssn":"1563-5236","printIssn":"1042-0940","active":true,"publicationSubtype":{"id":10}},"title":"Diverse dinosaur-dominated ichnofaunas from the Potomac Group (Lower Cretaceous) Maryland","docAbstract":"Until recently fossil footprints were virtually unknown from the Cretaceous of the eastern United States. The discovery of about 300 footprints in iron-rich siliciclastic facies of the Patuxent Formation (Potomac Group) of Aptian age is undoubtedly one of the most significant Early Cretaceous track discoveries since the Paluxy track discoveries in Texas in the 1930s. The Patuxent tracks include theropod, sauropod, ankylosaur and ornithopod dinosaur footprints, pterosaur tracks, and miscellaneous mammal and other vertebrate ichnites that collectively suggest a diversity of about 14 morphotypes. This is about twice the previous maximum estimate for any known Early Cretaceous vertebrate ichnofauna. Among the more distinctive forms are excellent examples of hypsilophodontid tracks and a surprisingly large mammal footprint. A remarkable feature of the Patuxent track assemblage is the high proportion of small tracks indicative of hatchlings, independently verified by the discovery of a hatchling-sized dinosaur. Such evidence suggests the proximity of nest sites. The preservation of such small tracks is very rare in the Cretaceous track record, and indeed throughout most of the Mesozoic.
This unusual preservation not only provides us with a window into a diverse Early Cretaceous ecosystem, but it also suggests the potential of such facies to provide ichnological bonanzas. A remarkable feature of the assemblage is that it consists largely of reworked nodules and clasts that may have previously been reworked within the Patuxent Formation. Such unusual contexts of preservation should provide intriguing research opportunities for sedimentologists interested in the diagenesis and taphonomy of a unique track-bearing facies.
","language":"English","publisher":"Taylor & Francis","doi":"10.1080/10420940601049404","usgsCitation":"Stanford, R., Lockley, M.G., and Weems, R.E., 2007, Diverse dinosaur-dominated ichnofaunas from the Potomac Group (Lower Cretaceous) Maryland: Ichnos: An International Journal for Plant and Animal Traces, v. 14, no. 3-4, p. 155-173, https://doi.org/10.1080/10420940601049404.","productDescription":"19 p.","startPage":"155","endPage":"173","costCenters":[],"links":[{"id":238889,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Maryland","volume":"14","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a034be4b0c8380cd503f1","contributors":{"authors":[{"text":"Stanford, Ray","contributorId":12240,"corporation":false,"usgs":false,"family":"Stanford","given":"Ray","email":"","affiliations":[],"preferred":false,"id":428614,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lockley, Martin G.","contributorId":22428,"corporation":false,"usgs":false,"family":"Lockley","given":"Martin","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":428616,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Weems, Robert E. 0000-0002-1907-7804 rweems@usgs.gov","orcid":"https://orcid.org/0000-0002-1907-7804","contributorId":2663,"corporation":false,"usgs":true,"family":"Weems","given":"Robert","email":"rweems@usgs.gov","middleInitial":"E.","affiliations":[{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true},{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"preferred":true,"id":428615,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70031052,"text":"70031052 - 2007 - A condensed middle Cenomanian succession in the Dakota Sandstone (Upper Cretaceous), Sevilleta National Wildlife Refuge, Socorro County, New Mexico","interactions":[],"lastModifiedDate":"2016-10-12T09:48:20","indexId":"70031052","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2860,"text":"New Mexico Geology","active":true,"publicationSubtype":{"id":10}},"title":"A condensed middle Cenomanian succession in the Dakota Sandstone (Upper Cretaceous), Sevilleta National Wildlife Refuge, Socorro County, New Mexico","docAbstract":"The upper part of the Dakota Sandstone exposed on the Sevilleta National Wildlife Refuge, northern Socorro County, New Mexico, is a condensed, Upper Cretaceous, marine succession spanning the first five middle Cenomanian ammonite zones of the U.S. Western Interior. Farther north in New Mexico these five ammonite zones occur over a stratigraphic interval more than an order of magnitude thicker. The basal part of this marine sequence was deposited in Seboyeta Bay, an elongate east-west embayment into New Mexico that marked the initial transgression of the western shoreline of the Late Cretaceous seaway into New Mexico.
The primary mechanism for condensing this section was nearshore, submarine erosion, although nondeposition played a minor role. The ammonite fossils from each zone are generally fragments of internal molds that are corroded on one side, indicating submarine burial, erosion of the prefossilized steinkern, and corrosion on the sea floor. In addition, the base of the condensed succession is marked by a thin bed that contains abundant, white-weathering, spherical to cylindrical phosphate nodules, many of which contain a cylindrical axial cavity of unknown origin.
The nodules lie on the bedding surface of the highly burrowed, ridge-forming sandstone near the top of the Dakota and occur in the overlying breccia. The breccia consists of rip-up clasts of sandstone and eroded internal molds of the ammonite Conlinoceras tarrantense, the zonal index for the basal middle Cenomanian. The nodules below the breccia imply a time of erosion followed by nondeposition or sediment bypass during which the phosphatization occurred. The breccia implies a time of submarine erosion, probably storm-related.
Remarkably, this condensed succession and the basal part of the overlying Mancos Shale tongue contain one of the most complete middle Cenomanian ammonite sequences in the U.S. Western Interior. Five of the six ammonite zones that characterize the middle Cenomanian of the Western Interior are found on Sevilleta National Wildlife Refuge. Only representatives of the second oldest zone are missing, although stratigraphically there is room for this zone. Fossils from each zone occur in stratigraphically separated beds; no zone overlaps with or is superimposed on another.
Maps of the western shoreline of the seaway at the beginning and end of the time represented by the condensed succession show the progression of the Late Cretaceous seaway from embayment to ocean covering most of New Mexico. These maps, combined with the resolving power of the middle Cenomanian biostratigraphic framework, indicate that the southern shoreline of Seboyeta Bay, which was only a few miles south of Sevilleta National Wildlife Refuge, was virtually stationary for most of this time. This ensured that the refuge was under shallow, well-oxygenated, marine waters for much of middle Cenomanian time. It also ensured that deposited sediments would be subjected periodically to erosion by nearshore waves and currents.
This report marks the first recorded occurrence in New Mexico of the following ammonite species: Acanthoceras muldoonense (zonal index), A. bellense (zonal index), Turrilites (Euturrilites) scheuchzerianus, Cunningtoniceras cf. C. cunningtoni, and Paraconlinoceras leonense. The occurrences of the zonal indices in the Dakota Sandstone on and to the south of the refuge increase not only their geographic distributions, but also the biostratigraphic resolution in the middle Cenomanian of New Mexico.
","language":"English","publisher":"New Mexico Bureau of Geology and Mineral Resources","issn":"0196948X","usgsCitation":"Hook, S.C., and Cobban, W., 2007, A condensed middle Cenomanian succession in the Dakota Sandstone (Upper Cretaceous), Sevilleta National Wildlife Refuge, Socorro County, New Mexico: New Mexico Geology, v. 29, no. 3, p. 75-96.","productDescription":"22 p.","startPage":"75","endPage":"96","costCenters":[{"id":207,"text":"Core Research Center","active":true,"usgs":true}],"links":[{"id":239008,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":270669,"type":{"id":15,"text":"Index Page"},"url":"https://geoinfo.nmt.edu/publications/periodicals/nmg/backissues/home.cfml?SpecificYear=&FromYear=&ToYear=&Volume=29&Number=3&title=&author=&keywords=&NMcounty=ANY&Submit=Search"}],"country":"United States","state":"New Mexico","county":"Socorro County","otherGeospatial":"Sevilleta National Wildlife Refuge","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -107.0898,34.1882 ], [ -107.0898,34.422 ], [ -106.5139,34.422 ], [ -106.5139,34.1882 ], [ -107.0898,34.1882 ] ] ] } } ] }","volume":"29","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e395e4b0c8380cd460f2","contributors":{"authors":[{"text":"Hook, Stephen C.","contributorId":175265,"corporation":false,"usgs":false,"family":"Hook","given":"Stephen","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":429787,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cobban, William A.","contributorId":99529,"corporation":false,"usgs":true,"family":"Cobban","given":"William A.","affiliations":[],"preferred":false,"id":429786,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70031067,"text":"70031067 - 2007 - Post-middle Miocene origin of modern landforms in the eastern Piedmont of Virginia","interactions":[],"lastModifiedDate":"2020-03-27T06:45:38","indexId":"70031067","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3481,"text":"Stratigraphy","active":true,"publicationSubtype":{"id":10}},"title":"Post-middle Miocene origin of modern landforms in the eastern Piedmont of Virginia","docAbstract":"Diverse late middle Miocene dinoflagellate floras, obtained from two sites along the western edge of the Atlantic Coastal Plain in central Virginia, indicate that the eastern Virginia Piedmont was covered by marine waters about 12-13 Ma. This transgression extended farther westward across the Virginia Piedmont than any other transgression that has been documented. Extensive fluvial deposits that may be associated with this transgression covered earlier stream patterns in the eastern Piedmont and buried them beneath a thin (probably less than 100 foot-thick) veneer of sand and gravel. During the subsequent regression, a linear down-slope stream-drainage pattern developed. Although it has been somewhat modified by later stream captures, it still is easily recognizable. This interval of marine inundation and deposition explains why modern stream patterns in the eastern Piedmont of Virginia strongly resemble the stream patterns in the Coastal Plain and differ from the structurally adjusted trellis stream patterns typical of the western Piedmont, Blue Ridge, and Valley and Ridge regions. Uplift of the modern Southern Appalachian Mountains began at the time of this transgression and was largely completed by the late Pliocene.","language":"English","issn":"00262803","usgsCitation":"Weems, R.E., and Edwards, L.E., 2007, Post-middle Miocene origin of modern landforms in the eastern Piedmont of Virginia: Stratigraphy, v. 4, no. 1, p. 35-48.","productDescription":"14 p.","startPage":"35","endPage":"48","numberOfPages":"14","costCenters":[{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true},{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"links":[{"id":238779,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Virginia ","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -83.4521484375,\n 36.66841891894786\n ],\n [\n -75.849609375,\n 36.59788913307022\n ],\n [\n -76.0693359375,\n 37.54457732085582\n ],\n [\n -76.6845703125,\n 38.85682013474361\n ],\n [\n -77.87109375,\n 39.33429742980725\n ],\n [\n -78.2666015625,\n 39.26628442213066\n ],\n [\n -79.365234375,\n 38.54816542304656\n ],\n [\n -80.2001953125,\n 37.43997405227057\n ],\n [\n -81.5625,\n 37.16031654673677\n ],\n [\n -81.9580078125,\n 37.47485808497102\n ],\n [\n -83.4521484375,\n 36.66841891894786\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"4","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7e6ae4b0c8380cd7a522","contributors":{"authors":[{"text":"Weems, Robert E. 0000-0002-1907-7804 rweems@usgs.gov","orcid":"https://orcid.org/0000-0002-1907-7804","contributorId":2663,"corporation":false,"usgs":true,"family":"Weems","given":"Robert","email":"rweems@usgs.gov","middleInitial":"E.","affiliations":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true},{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true}],"preferred":true,"id":429897,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Edwards, Lucy E. 0000-0003-4075-3317 leedward@usgs.gov","orcid":"https://orcid.org/0000-0003-4075-3317","contributorId":2647,"corporation":false,"usgs":true,"family":"Edwards","given":"Lucy","email":"leedward@usgs.gov","middleInitial":"E.","affiliations":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true},{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true}],"preferred":true,"id":429896,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70031099,"text":"70031099 - 2007 - Sources of speciated atmospheric mercury at a residential neighborhood impacted by industrial sources","interactions":[],"lastModifiedDate":"2018-10-16T11:24:35","indexId":"70031099","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Sources of speciated atmospheric mercury at a residential neighborhood impacted by industrial sources","docAbstract":"Speciated measurements of atmospheric mercury plumes were obtained at an industrially impacted residential area of East St. Louis, IL. These plumes were found to result in extremely high mercury concentrations at ground level that were composed of a wide distribution of mercury species. Ground level concentrations as high as 235 ng m-3 for elemental mercury (Hg 0) and 38 300 pg m-3 for reactive mercury species (reactive gaseous (RGM) plus particulate (PHg) mercury) were measured. The highest mercury concentrations observed during the study were associated with plumes that contained high concentrations of all mercury species (Hg 0, RGM, and PHg) and originated from a source located southwest of the sampling site. Variations in proportions of Hg0/RGM/PHg among plumes, with Hg0 dominating some plumes and RGM and/or PHg dominating others, were attributed to differences in emissions from different sources. Correlations between mercury plumes and elevated NOx were not observed; however, a correlation between elevated SO2 and mercury plumes was observed during some but not all plume events. Despite the presence of six coal-fired power plants within 60 km of the study site, wind direction data along with Hg/SO2 and Hg/NOx ratios suggest that high-concentration mercury plumes impacting the St. Louis-Midwest Particle Matter Supersite are attributable to local point sources within 5 km of the site.
","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Environmental Science and Technology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1021/es0700348","issn":"0013936X","usgsCitation":"Manolopoulos, H., Snyder, D., Schauer, J.J., Hill, J., Turner, J., Olson, M.L., and Krabbenhoft, D.P., 2007, Sources of speciated atmospheric mercury at a residential neighborhood impacted by industrial sources: Environmental Science & Technology, v. 41, no. 16, p. 5626-5633, https://doi.org/10.1021/es0700348.","productDescription":"8 p.","startPage":"5626","endPage":"5633","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":211427,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1021/es0700348"},{"id":238713,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Missouri","city":"St. Louis","otherGeospatial":"St. Louis-Midwest Particle Matter Supersite","volume":"41","issue":"16","noUsgsAuthors":false,"publicationDate":"2007-07-11","publicationStatus":"PW","scienceBaseUri":"505b9391e4b08c986b31a576","contributors":{"authors":[{"text":"Manolopoulos, H.","contributorId":74573,"corporation":false,"usgs":true,"family":"Manolopoulos","given":"H.","email":"","affiliations":[],"preferred":false,"id":430025,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Snyder, D.C.","contributorId":56853,"corporation":false,"usgs":true,"family":"Snyder","given":"D.C.","email":"","affiliations":[],"preferred":false,"id":430024,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Schauer, James J","contributorId":200131,"corporation":false,"usgs":false,"family":"Schauer","given":"James","email":"","middleInitial":"J","affiliations":[],"preferred":false,"id":430029,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hill, J.S.","contributorId":88553,"corporation":false,"usgs":true,"family":"Hill","given":"J.S.","email":"","affiliations":[],"preferred":false,"id":430026,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Turner, J.R.","contributorId":92487,"corporation":false,"usgs":true,"family":"Turner","given":"J.R.","email":"","affiliations":[],"preferred":false,"id":430028,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Olson, Mark L.","contributorId":149743,"corporation":false,"usgs":false,"family":"Olson","given":"Mark","email":"","middleInitial":"L.","affiliations":[{"id":17808,"text":"University of Illinois, Champaign","active":true,"usgs":false}],"preferred":false,"id":430023,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Krabbenhoft, David P. 0000-0003-1964-5020 dpkrabbe@usgs.gov","orcid":"https://orcid.org/0000-0003-1964-5020","contributorId":1658,"corporation":false,"usgs":true,"family":"Krabbenhoft","given":"David","email":"dpkrabbe@usgs.gov","middleInitial":"P.","affiliations":[{"id":677,"text":"Wisconsin Water Science Center","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":37947,"text":"Upper Midwest Water Science Center","active":true,"usgs":true},{"id":37464,"text":"WMA - Laboratory & Analytical Services Division","active":true,"usgs":true}],"preferred":true,"id":430027,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70031159,"text":"70031159 - 2007 - Reinterpretation of Paleoproterozoic accretionary boundaries of the north-central United States based on a new aeromagnetic-geologic compilation","interactions":[],"lastModifiedDate":"2012-03-12T17:21:19","indexId":"70031159","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3112,"text":"Precambrian Research","active":true,"publicationSubtype":{"id":10}},"title":"Reinterpretation of Paleoproterozoic accretionary boundaries of the north-central United States based on a new aeromagnetic-geologic compilation","docAbstract":"The Paleoproterozoic crust in the north-central U.S. represents intact juvenile terranes accreted to the rifted Archean Superior craton. A new tectonic province map, based on the interpretation of a new aeromagnetic compilation, published geologic maps, and recent geochronologic data, shows progressive accretion of juvenile arc terranes from ca. 1900-1600 Ma. Contrary to earlier models, geon 18 Penokean-interval crust is primarily confined to a ???2100 Ma tectonic embayment of the rifted Superior craton. The newly defined Spirit Lake tectonic zone, characterized by a sharp magnetic discontinuity that marks the southern limit of Archean and Penokean-interval rocks, is here interpreted to represent an eastern analog of the Cheyenne belt suture zone in southern Wyoming. South of this boundary, geon 17 Yavapai-interval rocks form the basement upon which 1750 Ma rhyolite and succeeding quartzite sequences were deposited. Substantial portions of the Penokean and Yavapai terranes were subsequently deformed during the 1650-1630 Ma Mazatzal orogeny. The northern boundary of the Mazatzal terrane is obscured by abundant 1470-1430 Ma \"anorogenic\" plutons that stitched the suture with the older Yavapai terrane rocks. These data reveal a progressive tectonic younging to the south as the Laurentian craton grew southward and stabilized during the Proterozoic. Late Mesoproterozoic rift magmatism produced pronounced geophysical anomalies, indicating strong, but localized crustal modification. In comparison to the western U.S., little tectonism has occurred here in the last 1 billion years, providing a uniquely preserved record of the Precambrian evolution of the continental U.S. lithosphere. ?? 2007 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Precambrian Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.precamres.2007.02.023","issn":"03019268","usgsCitation":"Holm, D., Anderson, R., Boerboom, T., Cannon, W., Chandler, V., Jirsa, M., Miller, J., Schneider, D., Schulz, K.J., and Van Schmus, W.R., 2007, Reinterpretation of Paleoproterozoic accretionary boundaries of the north-central United States based on a new aeromagnetic-geologic compilation: Precambrian Research, v. 157, no. 1-4, p. 71-79, https://doi.org/10.1016/j.precamres.2007.02.023.","startPage":"71","endPage":"79","numberOfPages":"9","costCenters":[],"links":[{"id":211378,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.precamres.2007.02.023"},{"id":238658,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"157","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50e4a608e4b0e8fec6cdc07a","contributors":{"authors":[{"text":"Holm, D.K.","contributorId":68955,"corporation":false,"usgs":true,"family":"Holm","given":"D.K.","email":"","affiliations":[],"preferred":false,"id":430303,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Anderson, R.","contributorId":104191,"corporation":false,"usgs":false,"family":"Anderson","given":"R.","affiliations":[],"preferred":false,"id":430309,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Boerboom, Terrence","contributorId":11785,"corporation":false,"usgs":true,"family":"Boerboom","given":"Terrence","affiliations":[],"preferred":false,"id":430300,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Cannon, W.F. 0000-0002-2699-8118","orcid":"https://orcid.org/0000-0002-2699-8118","contributorId":70382,"corporation":false,"usgs":true,"family":"Cannon","given":"W.F.","affiliations":[],"preferred":false,"id":430305,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Chandler, V.","contributorId":69776,"corporation":false,"usgs":true,"family":"Chandler","given":"V.","email":"","affiliations":[],"preferred":false,"id":430304,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Jirsa, M.","contributorId":82125,"corporation":false,"usgs":true,"family":"Jirsa","given":"M.","affiliations":[],"preferred":false,"id":430307,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Miller, J.","contributorId":16939,"corporation":false,"usgs":true,"family":"Miller","given":"J.","affiliations":[],"preferred":false,"id":430301,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Schneider, D.A.","contributorId":58457,"corporation":false,"usgs":true,"family":"Schneider","given":"D.A.","email":"","affiliations":[],"preferred":false,"id":430302,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Schulz, K. J.","contributorId":79131,"corporation":false,"usgs":true,"family":"Schulz","given":"K.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":430306,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Van Schmus, W. R.","contributorId":83114,"corporation":false,"usgs":true,"family":"Van Schmus","given":"W.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":430308,"contributorType":{"id":1,"text":"Authors"},"rank":10}]}} ]}