{"pageNumber":"441","pageRowStart":"11000","pageSize":"25","recordCount":11003,"records":[{"id":70038931,"text":"70038931 - 1874 - [Seventh] Annual Report of the United States Geological and Geographical Survey of the Territories, embracing Colorado: being a report of progress of the exploration for the year 1873","interactions":[],"lastModifiedDate":"2014-06-02T05:46:17","indexId":"70038931","displayToPublicDate":"2012-06-10T10:32:00","publicationYear":"1874","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":6,"text":"USGS Unnumbered Series"},"seriesTitle":{"id":345,"text":"Annual Report","active":false,"publicationSubtype":{"id":6}},"subseriesTitle":"U.S. Geological and Geographical Survey of the Territories","title":"[Seventh] Annual Report of the United States Geological and Geographical Survey of the Territories, embracing Colorado: being a report of progress of the exploration for the year 1873","docAbstract":"In accordance with the recommendation of the Secretary of the Interior, an appropriation of $75,000 was made for the systematic survey of Colorado, and, at as early a date as the season would permit, the party reached Denver. This place formed our starting point for the various portions of the territory which had previously been marked out for the season's work. Early in the winter, the area to be surveyed in Colorado was divided into three districts, and a preliminary map was constructed, based on the land-surveys of the portions concerning which there was any definite knowledge. We found that none of the existing maps were of any great service in the more elevated portions of Colorado. The area to be surveyed comprised the eastern portion of the mountainous part of Colorado, and it was separated into three districts: North, Middle, and South districts.","language":"English","publisher":"Government Printing Office","publisherLocation":"Washington, D.C.","doi":"10.3133/70038931","collaboration":"Conducted under the authority of the Secretary of the Interior.  List of annual reports, with contents of each, and author and subject index may be found in \"Catalogue and index of the publications of the Hayden, King, Powell, and Wheeler surveys\" by L.F. Schmeckebier. 1904. (U.S. Geological Survey. Bulletin no. 222).","usgsCitation":"Hayden, F., 1874, [Seventh] Annual Report of the United States Geological and Geographical Survey of the Territories, embracing Colorado: being a report of progress of the exploration for the year 1873: Annual Report, xii, 718 p., https://doi.org/10.3133/70038931.","productDescription":"xii, 718 p.","numberOfPages":"895","costCenters":[{"id":602,"text":"U.S. Geological and Geographical Survey of the Territories","active":false,"usgs":true}],"links":[{"id":287914,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":287913,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/unnumbered/70038931/report.pdf"}],"country":"United States","state":"Colorado","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -109.0603,36.9924 ], [ -109.0603,41.0034 ], [ -102.0409,41.0034 ], [ -102.0409,36.9924 ], [ -109.0603,36.9924 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bd342e4b08c986b32fc82","contributors":{"authors":[{"text":"Hayden, Ferdinand Vandeveer","contributorId":27306,"corporation":false,"usgs":true,"family":"Hayden","given":"Ferdinand Vandeveer","affiliations":[],"preferred":false,"id":465267,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70206058,"text":"70206058 - null - Early Paleozoic composite melange terrane, central Appalachian Piedmont, Virginia and Maryland; Its origin and tectonic history","interactions":[{"subject":{"id":70206058,"text":"70206058 - null - Early Paleozoic composite melange terrane, central Appalachian Piedmont, Virginia and Maryland; Its origin and tectonic history","indexId":"70206058","noYear":false,"displayTitle":"Early Paleozoic composite mélange terrane, central Appalachian Piedmont, Virginia and Maryland; Its origin and tectonic history","title":"Early Paleozoic composite melange terrane, central Appalachian Piedmont, Virginia and Maryland; Its origin and tectonic history"},"predicate":"IS_PART_OF","object":{"id":70206054,"text":"70206054 - 1989 - Melanges Olistostromes of the U.S. Appalachians","indexId":"70206054","publicationYear":"1989","noYear":false,"title":"Melanges Olistostromes of the U.S. Appalachians"},"id":1}],"isPartOf":{"id":70206054,"text":"70206054 - 1989 - Melanges Olistostromes of the U.S. Appalachians","indexId":"70206054","publicationYear":"1989","noYear":false,"title":"Melanges Olistostromes of the U.S. Appalachians"},"lastModifiedDate":"2019-10-18T15:37:18","indexId":"70206058","displayToPublicDate":"2020-01-01T15:28:44","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"displayTitle":"Early Paleozoic composite mélange terrane, central Appalachian Piedmont, Virginia and Maryland; Its origin and tectonic history","title":"Early Paleozoic composite melange terrane, central Appalachian Piedmont, Virginia and Maryland; Its origin and tectonic history","docAbstract":"<div class=\"widget widget-BookChapterMainView widget-instance-BookChapterMainView\"><div class=\"content-inner-wrap\"><div class=\"book-chapter-body\"><div id=\"ContentTab\" class=\"content active\"><div class=\"widget widget-BookSectionsText widget-instance-BookChaptertext\"><div class=\"module-widget\"><div class=\"widget-items\" data-widgetname=\"BookSectionsText\"><div class=\"category-section clearfix content-section\"><p>Two distinct types of mélange deposits, distinguished by their matrix, occur within a collage of thrust slices in the Piedmont of the central Appalachians. They crop out in a northeast-trending belt that extends from at least central Virginia northeastward through most of Maryland. One type is a block-in-phyllite mélange that constitutes the Mine Run Complex (new name) of Virginia. It consists of a variety of metaplutonic, metavolcanic, mafic, and ultramafic blocks enclosed within a matrix of phyllite or schist and metasandstones of feldspathic or quartz metagraywacke. The Mine Run Complex is interpreted to consist of four imbricated thrust slices, each with its own distinctive exotic block content. The blocks in one of these mélange subunits (III) are almost exclusively mafic and ultramafic rocks, such as serpentinite, greenschist, metabasalt, and talc schist. The second mélange type within this Piedmont terrane, a metadiamictite, contains a less extensive variety of exotic blocks, the most common being mafic and ultramafic blocks. Such exotic blocks are enclosed in a micaceous quartzofeldspathic matrix, which has contemporaneously deposited schist and quartz-lump fragments as its characterizing features. The Sykesville Formation of Maryland and Virginia is typical of this type of mélange. Several varieties of metadiamictite that have some lithologic differences from the type locality of the Sykesville have been recognized in Virginia and are described as the Lunga Reservoir and the Purcell Branch Formations (new names).</p><p>Mélanges of the block-in-phyllite and the metadiamictite types are interpreted as having been formed in a Cambrian-Ordovician back-arc or marginal basin that lay on the continentward side of an island-arc system (central Virginia volcanic-plutonic belt and the James Run Formation of Maryland) that had formed in Cambrian time. This Cambrian-Ordovician back-arc basin is assumed to have been underlain, at least initially, by a transform-segmented spreading ridge.</p><p>The metadiamictite deposits now occur, for the most part, along the flanks and at the southeastern end of the Baltimore-Washington anticlinorium or antiform. This spatial relation is interpreted to be a consequence of thrusting of the diamictite across, as well as onto, the cover rocks and basement of the anticlinorial core terrane (“Baltimoria”) during the Taconic orogeny. The chaotic-textured diamictite formed as a sedimentary slump or slide apron or aprons somewhere to the east of “Baltimoria.” The source area for this diamictite probably was another crystalline landmass that lay east of “Baltimoria.” The matrix rocks of the block-in-phyllite mélange (Mine Run Complex) may have accumulated contemporaneously, in part with diamictite, probably by along-trough basin sedimentation. The block-in-phyllite mélanges of the Mine Run Complex occur south of the Baltimore-Washington anticlinorium metadiamictite terrane and are not associated directly with metadiamictite mélanges.</p><p>The metavolcanic and metaplutonic blocks within the eastern parts of the Mine Run Complex probably were shed from the island-arc terrane as it was thrust westward during the progressive tectonic telescoping of the back-arc basin in Cambrian and Ordovician time. The mafic and ultramafic blocks in both types of mélanges are believed to have been derived, in part, from the “oceanic” back-arc basin floor from various sources and different processes. Ultramafic protrusions, for example, may have been emplaced periodically along transform faults. Some of the mafic-ultramafic rock may have formed talus rubble along steep submarine scarps. Others may represent blocks broken and segmented by faults from what once were mafic sills emplaced within the sediments accumulating in the basin.</p></div></div></div></div></div></div></div></div><div class=\"widget widget-SitePageFooter widget-instance-SitePageFooter\"><div class=\"journal-footer journal-bg\"><div class=\"journal-footer_content clearfix foot-left\"><div class=\"journal-footer-colophon\"><br data-mce-bogus=\"1\"></div></div></div></div>","usgsCitation":"Pavlides, L., Early Paleozoic composite melange terrane, central Appalachian Piedmont, Virginia and Maryland; Its origin and tectonic history, p. 135-193.","productDescription":"59 p.","startPage":"135","endPage":"193","costCenters":[],"links":[{"id":368427,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Maryland, Virginiia","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -79.22241210937499,\n              39.70718665682654\n            ],\n            [\n              -80.2935791015625,\n              38.013476231041935\n            ],\n            [\n              -81.9140625,\n              37.48793540168987\n            ],\n            [\n              -83.5400390625,\n              36.65079252503471\n            ],\n            [\n              -82.0733642578125,\n              36.61552763134925\n            ],\n            [\n              -80.4638671875,\n              36.58024660149866\n            ],\n            [\n              -78.3929443359375,\n              37.87485339352928\n            ],\n            [\n              -77.135009765625,\n              39.70296052957233\n            ],\n            [\n              -79.22241210937499,\n              39.70718665682654\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Pavlides, Louis","contributorId":79444,"corporation":false,"usgs":true,"family":"Pavlides","given":"Louis","email":"","affiliations":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"preferred":false,"id":773440,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70241993,"text":"70241993 - null - Silurian-Devonian age and tectonic setting of the Connecticut Valley-Gaspé trough of Vermont using U-Pb SHRIMP analyses of detrital zircons","interactions":[],"lastModifiedDate":"2023-04-03T16:33:38.685074","indexId":"70241993","displayToPublicDate":"2010-05-01T10:43:49","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":732,"text":"American Journal of Science","active":true,"publicationSubtype":{"id":10}},"title":"Silurian-Devonian age and tectonic setting of the Connecticut Valley-Gaspé trough of Vermont using U-Pb SHRIMP analyses of detrital zircons","docAbstract":"<p>U-Pb SHRIMP ages of detrital zircons from metasedimentary rocks of the Connecticut Valley-Gaspe' trough in Vermont corroborate a Silurian-Devonian age of deposition for these strata and constrain their provenances. Ages of randomly selected detrital zircons obtained from quartzites within the Waits River and Gile Mountain Formations range from Archean to Devonian with Mesoproterozoic, Neoproterozoic, Ordovician, and Silurian age populations suggesting both eastern and western sources of the sediments. The two youngest single-grain detrital zircon ages from samples collected in the Waits River Formation are 418 <span>±</span> 7 and 415 <span>±</span> 2 Ma. The youngest single-grain detrital zircon age from the eastern part of the Gile Mountain Formation is 411 <span>±</span> 8. The youngest detrital zircons from the western portion of the Gile Mountain Formation comprise an age population with a weighted average of 409<span>±</span>5 Ma. These~409 Ma zircons are likely of volcanic origin, perhaps derived from the Piscataquis magmatic belt to the east. The absence of younger volcanic zircons in the coarser-grained eastern facies of the Gile Mountain Formation suggests the eastern sediments are older and were buried during Piscataquis volcanism and deposition in the west. </p><p>The shift in protoliths from calcareous silts and muds of the Waits River Formation to quartzo-feldspathic sands of the Gile Mountain Formation implies a change from a continental slope-like depositional environment to a near-shore or terrestrial environment of deposition. This change supports a transition in the nature of the basin from an intercontinental back-arc extensional setting to a foreland basin setting. Maximum depositional ages of sediments above and below this facies boundary constrain the timing of transition in basin style between about 415 and 411 Ma. Given the timing of the approaching Acadian wedge, this shift in basin style likely reflects westward migration of thrust sheets during the Acadian orogeny. The finegrained nature of the youngest silts, muds and turbidites suggests that sedimentation occurred in increasingly deeper water. The implied basin subsidence was likely caused by lithospheric flexure as the Acadian wedge approached from the east. The timing of this subsidence is constrained to be younger than the youngest zircons at about 409 Ma.</p>","doi":"10.2475/05.2010.01","usgsCitation":"McWilliams, C.K., Walsh, G.J., and Wintsch, R.P., Silurian-Devonian age and tectonic setting of the Connecticut Valley-Gaspé trough of Vermont using U-Pb SHRIMP analyses of detrital zircons: American Journal of Science, v. 310, no. 5, p. 325-363, https://doi.org/10.2475/05.2010.01.","productDescription":"39 p,","startPage":"325","endPage":"363","costCenters":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"links":[{"id":415084,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Vermont","otherGeospatial":"Connecticut Valley-Gaspé trough","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"coordinates\": [\n          [\n            [\n              -73.0584464098593,\n              43.08244702843251\n            ],\n            [\n              -72.41618856372972,\n              43.07710622647042\n            ],\n            [\n              -72.34695793118665,\n              43.58931291576778\n            ],\n            [\n              -72.03970726311911,\n              44.05770856512157\n            ],\n            [\n              -72.02696782434163,\n              44.30460320930763\n            ],\n            [\n              -71.71664844560044,\n              44.40580442349673\n            ],\n            [\n              -71.52347555482625,\n              44.59219196351697\n            ],\n            [\n              -71.60497257872095,\n              44.788650957990455\n            ],\n            [\n              -71.48198767752757,\n              44.992641539788565\n            ],\n            [\n              -73.04861643956963,\n              45.000876525670435\n            ],\n            [\n              -73.0584464098593,\n              43.08244702843251\n            ]\n          ]\n        ],\n        \"type\": \"Polygon\"\n      }\n    }\n  ]\n}","volume":"310","issue":"5","noUsgsAuthors":false,"publicationDate":"2010-08-11","publicationStatus":"PW","contributors":{"authors":[{"text":"McWilliams, C. K.","contributorId":49981,"corporation":false,"usgs":false,"family":"McWilliams","given":"C.","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":868458,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Walsh, Gregory J. 0000-0003-4264-8836 gwalsh@usgs.gov","orcid":"https://orcid.org/0000-0003-4264-8836","contributorId":873,"corporation":false,"usgs":true,"family":"Walsh","given":"Gregory","email":"gwalsh@usgs.gov","middleInitial":"J.","affiliations":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"preferred":true,"id":868459,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wintsch, Robert P.","contributorId":39807,"corporation":false,"usgs":true,"family":"Wintsch","given":"Robert","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":868460,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
]}