A distinctive two-fold sedimentation unit characterizes lamination in the upper swash zone of beaches. Within the unit a fine and/or a heavy mineral rich layer at the base grades upward into a coarser and/or a heavy mineral poor layer at the top. This distinctive type of lamination results from grain segregation within bed flow during wave backwash.
Stable isotopes of hydrogen and oxygen, together with chemical analyses, were determined for 20 surface waters, 8 shallow potable formation waters, and 79 formation waters from oil fields and gas fields. The observed isotope ratios can be explained by mixing of surface water and diagenetically modified sea water, accompanied by a process which enriches the heavy oxygen isotope. Mass balances for deuterium and total dissolved solids in the western Canada sedimentary basin demonstrate that the present distribution of deuterium in formation waters of the basin can be derived through mixing of the diagenetically modified sea water with not more than 2.9 times as much fresh water at the same latitude, and that the movement of fresh water through the basin has redistributed the dissolved solids of the modified sea water into the observed salinity variations. Statistical analysis of the isotope data indicates that although exchange of deuterium between water and hydrogen sulphide takes place within the basin, the effect is minimized because of an insignificant mass of hydrogen sulphide compared to the mass of formation water. Conversely, exchange of oxygen isotopes between water and carbonate minerals causes a major oxygen-18 enrichment of formation waters, depending on the relative masses of water and carbonate. Qualitative evidence confirms the isotopic fractionation of deuterium on passage of water through micropores in shales.
The Murray fracture has been thought to extend ashore into the Transverse Ranges of California, but a geophysical study shows no evidence of structural continuity between these features. Instead, basement morphology typical of the Murray fracture zone ends where its known magnetic and bathymetric expression dies out. Similarly, east-west Transverse Range structures change direction so that they are parallel to the northwest trend of the coast rather than crossing the continental shelf and slope. The lack of continuity suggests an independent development of the Transverse Ranges since at least mid-Tertiary time along an older structural trend continuous with the Murray fracture zone. Possibly a fundamental lineament in the crust, an extension of the Murray, inactive since at least the mid-Tertiary, provided a convenient trend for development of the Transverse Ranges in response to deformation along the San Andreas fault system. The Murray fracture zone is thought by some authors to be a transform-fault. The transform-fault hypothesis alleviates some difficulties that arise in explaining the origin of the zone by transcurrent faulting but equivalent uncertainties seem to accompany the newer explanation.
No abstract available.
","language":"English","publisher":"American Fisheries Society","doi":"10.1577/1548-8640(1969)31[35:HSATEO]2.0.CO;2","usgsCitation":"Hoffman, G.L., and Putz, R.E., 1969, Host susceptibility and the effect of aging, freezing, heat, and chemicals on spores of Myxosoma cerebralis: Progressive Fish-Culturist, v. 31, no. 1, p. 35-37, https://doi.org/10.1577/1548-8640(1969)31[35:HSATEO]2.0.CO;2.","productDescription":"3 p.","startPage":"35","endPage":"37","costCenters":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true}],"links":[{"id":130962,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"31","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a54e4b07f02db62be37","contributors":{"authors":[{"text":"Hoffman, Glenn L.","contributorId":95934,"corporation":false,"usgs":true,"family":"Hoffman","given":"Glenn","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":320190,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Putz, Robert E.","contributorId":13670,"corporation":false,"usgs":true,"family":"Putz","given":"Robert","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":320189,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":1000459,"text":"1000459 - 1969 - Maturity and fecundity of walleyes from the eastern and western basins of Lake Erie","interactions":[],"lastModifiedDate":"2025-03-04T16:56:38.223568","indexId":"1000459","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2543,"text":"Journal of the Fisheries Research Board of Canada","active":true,"publicationSubtype":{"id":10}},"title":"Maturity and fecundity of walleyes from the eastern and western basins of Lake Erie","docAbstract":"Of 2427 walleyes (Stizostedion vitreum vitreum (Mitchill)) examined from Lake Erie in 1964–66, no females were mature at ages below III and all were mature at age V. All male walleyes from the eastern basin were mature at age II, and those from the western basin at age III. Females from the western basin matured at a shorter length and a younger age than those from the eastern basin. Males from the western basin, on the other hand, matured at a longer length and greater age than those from the eastern basin.Egg production, which was estimated for 60 walleyes from the eastern basin and 78 from the western basin, ranged from 48,000 to 614,000. The number of eggs increased rapidly with increase in total length, but the relation between fecundity and weight was almost linear. Walleyes from the western basin were much more fecund for any given length, weight, or age than those from the eastern basin. Weight was the most accurate indicator of fecundity. The mean diameter of eggs from 32 ripe walleyes was 1.72 mm. Little relation existed between egg diameter and length or age of fish.
","language":"English","publisher":"Canadian Science Publishing","doi":"10.1139/f69-171","usgsCitation":"Wolfert, D.R., 1969, Maturity and fecundity of walleyes from the eastern and western basins of Lake Erie: Journal of the Fisheries Research Board of Canada, v. 26, no. 7, p. 1877-1888, https://doi.org/10.1139/f69-171.","productDescription":"12 p.","startPage":"1877","endPage":"1888","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":133143,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"26","issue":"7","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a27e4b07f02db610052","contributors":{"authors":[{"text":"Wolfert, David R.","contributorId":49305,"corporation":false,"usgs":true,"family":"Wolfert","given":"David","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":308574,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70191027,"text":"70191027 - 1969 - Water in Kentucky","interactions":[],"lastModifiedDate":"2017-09-21T15:15:18","indexId":"70191027","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":2,"text":"State or Local Government Series"},"seriesTitle":{"id":5503,"text":"Kentucky Geological Survey Special Publication","active":true,"publicationSubtype":{"id":2}},"seriesNumber":"16-10","title":"Water in Kentucky","docAbstract":"No abstract available.
","language":"English","publisher":"Kentucky Geological Survey","usgsCitation":"Krieger, R.A., Cushman, R.V., and Thomas, N., 1969, Water in Kentucky: Kentucky Geological Survey Special Publication 16-10, 51 p.","productDescription":"51 p.","costCenters":[],"links":[{"id":345994,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":345993,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://kgs.uky.edu/kgsweb/pubs/pubsearch.asp","text":"Available from the Kentucky Geological Survey"}],"country":"United States","state":"Kentucky","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"59c4cf9ae4b017cf313d3cce","contributors":{"authors":[{"text":"Krieger, Robert A.","contributorId":99954,"corporation":false,"usgs":true,"family":"Krieger","given":"Robert","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":711006,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cushman, Robert Vittum","contributorId":96661,"corporation":false,"usgs":true,"family":"Cushman","given":"Robert","email":"","middleInitial":"Vittum","affiliations":[],"preferred":false,"id":711007,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thomas, N.O.","contributorId":99962,"corporation":false,"usgs":true,"family":"Thomas","given":"N.O.","email":"","affiliations":[],"preferred":false,"id":711008,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70045464,"text":"70045464 - 1969 - Hydrology of the San Luis Valley, south-central Colorado","interactions":[],"lastModifiedDate":"2013-05-23T11:41:05","indexId":"70045464","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":6,"text":"USGS Unnumbered Series"},"seriesTitle":{"id":375,"text":"Open-File Report","active":false,"publicationSubtype":{"id":6}},"title":"Hydrology of the San Luis Valley, south-central Colorado","docAbstract":"An investigation of the water resources of the Colorado part of the San Luis Valley was begun in 1966 by the U.S. Geological Survey, in cooperation with the Colorado Water Conservation Board. (See index map, fig. 1). The purpose of the investigation is to provide information for planning and implementing improved water-development and management practices. The major water problems in the San Luis Valley include (1) waterlogging, (2) waste of water by nonbeneficial evapotranspiration, (3) deterioration of ground-water chemical quality, and (4) failure of Colorado to deliver water to New Mexico and Texas in accordance with the Rio Grande Compact. This report describes the hydrologic environment, extent of water-resource development, and some of the problems related to that development. Information presented is based on data collected from 1966 to 1968 and on previous studies. Subsequent reports are planned as the investigation progresses. The San Luis Valley extends about 100 miles from Poncha Pass near the northeast corner of Saguache County, Colo., to a point about 16 miles south of the Colorado-New Mexico State line. The total area is 3,125 square miles, of which about 3,000 are in Colorado. The valley is nearly flat except for the San Luis Hills and a few other small areas. The Colorado part of the San Luis Valley, which is described in this report, has an average altitude of about 7,700 feet. Bounding the valley on the west are the San Juan Mountains and on the east the Sangre de Cristo Mountains. Most of the valley floor is bordered by alluvial fans deposited by streams originating in the mountains, the most extensive being the Rio Grande fan (see block diagram, fig. 2 in pocket). Most of the streamflow is derived from snowmelt from 4,700 square miles of watershed in the surrounding mountains. The northern half of the San Luis Valley is internally drained and is referred to as the closed basin. The lowest part of this area is known locally as the \"sump.\" The remainder of the valley is drained by the Rio Grande and its tributaries. The climate of the San Luis Valley is arid, and a successful agricultural economy would not be possible without irrigation. It is characterized by cold winters, moderate summers, and much sunshine. The average annual precipitation on the valley floor ranges from 7 to 10 inches. More than half the precipitation occurs from July to September. Moisture deficiency in the valley is shown by the graph comparing pan evaporation and precipitation {fig. 3}. For the years 1961-67 average pan evaporation for the period April through September was 52.25 inches, but average precipitation for the period was only 5.02 inches. Average annual precipitation was 7.8 inches. Owing to the short growing season (90-120 days), crops a.re restricted mainly to barley, oats, potatoes, and other vegetables.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Denver, CO","doi":"10.3133/70045464","collaboration":"Prepared in cooperation with the Colorado Water Conservation Board","usgsCitation":"Emery, P.A., Boettcher, A.J., Snipes, R., and Mcintyre, H., 1969, Hydrology of the San Luis Valley, south-central Colorado: Open-File Report, ii, 22 p.; 3 Plates: 23.79 x 27.78 inches or smaller, https://doi.org/10.3133/70045464.","productDescription":"ii, 22 p.; 3 Plates: 23.79 x 27.78 inches or smaller","numberOfPages":"26","additionalOnlineFiles":"Y","temporalStart":"1966-01-01","temporalEnd":"1968-12-31","costCenters":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true}],"links":[{"id":271022,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/unnumbered/70045464/report-thumb.jpg"},{"id":272738,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/unnumbered/70045464/report.pdf"},{"id":272739,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/unnumbered/70045464/plate-2.pdf"},{"id":272740,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/unnumbered/70045464/plate-4.pdf"},{"id":272741,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/unnumbered/70045464/plate-7.pdf"}],"country":"United States","state":"Colorado","county":"Alamosa;Conejos;Costilla;Custer;Huerfano;Rio Grande;Saguache","otherGeospatial":"San Luis Valley","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -105.25,37.0 ], [ -105.25,38.5 ], [ -106.75,38.5 ], [ -106.75,37.0 ], [ -105.25,37.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"516fc466e4b05024ef3cd408","contributors":{"authors":[{"text":"Emery, P. A.","contributorId":49392,"corporation":false,"usgs":true,"family":"Emery","given":"P.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":477543,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Boettcher, A. J.","contributorId":25965,"corporation":false,"usgs":true,"family":"Boettcher","given":"A.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":477541,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Snipes, R.J.","contributorId":16813,"corporation":false,"usgs":true,"family":"Snipes","given":"R.J.","affiliations":[],"preferred":false,"id":477540,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Mcintyre, H.J. Jr.","contributorId":34027,"corporation":false,"usgs":true,"family":"Mcintyre","given":"H.J.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":477542,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70185944,"text":"70185944 - 1969 - Landscape esthetics: How to quantify the scenics of a river valley","interactions":[],"lastModifiedDate":"2017-03-29T15:00:07","indexId":"70185944","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2825,"text":"Natural History","active":true,"publicationSubtype":{"id":10}},"title":"Landscape esthetics: How to quantify the scenics of a river valley","docAbstract":"There are an increasing number of bills before Congress that in one way or another affect the landscape or the environment. Each of these requires seemingly endless numbers of congressional hearings, which are recorded upon endless reams of paper.
And if, for some reason, you happen to read the voluminous testimony surrounding one of these environment-affecting proposals, you will generally find a marked contrast between the volume and kind of information presented by those who are pressing for technical development - building a dam, constructing a highway, installing a nuclear power plant - and the testimony of those who either oppose the development or wish to alter it in some way. The developer usually employs numerical arguments, which tend to show that there is an economic benefit to be obtained by constructing something - whatever that something may be. The argument is usually expressed in terms of a \"cost-benefit ratio.\" It is typically argued, for instance, that the construction cost of a given project will be repaid over a period of time and will yield a profit or a benefit in excess of the development costs by a ratio of, let us say, 1.2 to 1. The argument is further supported with great numbers of charts, graphs, tables, and additional figures.
In marked contrast, those who favor protection of the environment against development are fewer in number, their statements are based on emotion or personal feelings, and they usually lack numerical information, quantitative data, and detailed computations. Perhaps this is the reason why this latter group seems to be continually fighting rearguard actions - losing battle after battle.
","language":"English","publisher":"American Museum of Natural History","usgsCitation":"Leopold, L.B., 1969, Landscape esthetics: How to quantify the scenics of a river valley: Natural History, no. October 1969, p. 37-44.","productDescription":"8 p.","startPage":"37","endPage":"44","costCenters":[],"links":[{"id":338683,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"issue":"October 1969","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58dcc823e4b02ff32c68576e","contributors":{"authors":[{"text":"Leopold, Luna Bergere","contributorId":93884,"corporation":false,"usgs":true,"family":"Leopold","given":"Luna","email":"","middleInitial":"Bergere","affiliations":[],"preferred":false,"id":687150,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":1007611,"text":"1007611 - 1969 - A demographic analysis of fenced populations of the whiptail lizard, Cnemidophorus tigris, in southern Nevada","interactions":[],"lastModifiedDate":"2012-02-02T00:04:16","indexId":"1007611","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3451,"text":"Southwestern Naturalist","active":true,"publicationSubtype":{"id":10}},"title":"A demographic analysis of fenced populations of the whiptail lizard, Cnemidophorus tigris, in southern Nevada","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Southwestern Naturalist","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Turner, F., Medica, P., Lannom, J., and Hoddenbach, G., 1969, A demographic analysis of fenced populations of the whiptail lizard, Cnemidophorus tigris, in southern Nevada: Southwestern Naturalist, v. 14, p. 189-202.","productDescription":"p. 189-202","startPage":"189","endPage":"202","numberOfPages":"14","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":130325,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"14","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b25e4b07f02db6aefc9","contributors":{"authors":[{"text":"Turner, F.B.","contributorId":95414,"corporation":false,"usgs":true,"family":"Turner","given":"F.B.","email":"","affiliations":[],"preferred":false,"id":315710,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Medica, P.A.","contributorId":77079,"corporation":false,"usgs":true,"family":"Medica","given":"P.A.","email":"","affiliations":[],"preferred":false,"id":315708,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Lannom, J.R. Jr.","contributorId":96624,"corporation":false,"usgs":true,"family":"Lannom","given":"J.R.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":315711,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hoddenbach, G.A.","contributorId":82639,"corporation":false,"usgs":true,"family":"Hoddenbach","given":"G.A.","email":"","affiliations":[],"preferred":false,"id":315709,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":1007613,"text":"1007613 - 1969 - Density and composition of fenced populations of leopard lizards (Crotaphytus wislizenii) in southern Nevada","interactions":[],"lastModifiedDate":"2012-02-02T00:04:16","indexId":"1007613","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1892,"text":"Herpetologica","active":true,"publicationSubtype":{"id":10}},"title":"Density and composition of fenced populations of leopard lizards (Crotaphytus wislizenii) in southern Nevada","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Herpetologica","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Turner, F., Lannom, J., Medica, P., and Hoddenbach, G., 1969, Density and composition of fenced populations of leopard lizards (Crotaphytus wislizenii) in southern Nevada: Herpetologica, v. 25, p. 247-257.","productDescription":"p. 247-257","startPage":"247","endPage":"257","numberOfPages":"11","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":130349,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"25","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a80e4b07f02db649603","contributors":{"authors":[{"text":"Turner, F.B.","contributorId":95414,"corporation":false,"usgs":true,"family":"Turner","given":"F.B.","email":"","affiliations":[],"preferred":false,"id":315718,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lannom, J.R. Jr.","contributorId":96624,"corporation":false,"usgs":true,"family":"Lannom","given":"J.R.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":315719,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Medica, P.A.","contributorId":77079,"corporation":false,"usgs":true,"family":"Medica","given":"P.A.","email":"","affiliations":[],"preferred":false,"id":315716,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hoddenbach, G.A.","contributorId":82639,"corporation":false,"usgs":true,"family":"Hoddenbach","given":"G.A.","email":"","affiliations":[],"preferred":false,"id":315717,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":1007614,"text":"1007614 - 1969 - First records of Plethodon dunni in California and new distributional data on Ascaphus truei, Rhyacotriton olympicus, and Hydromantes shastae","interactions":[],"lastModifiedDate":"2017-11-21T16:40:02","indexId":"1007614","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2334,"text":"Journal of Herpetology","active":true,"publicationSubtype":{"id":10}},"title":"First records of Plethodon dunni in California and new distributional data on Ascaphus truei, Rhyacotriton olympicus, and Hydromantes shastae","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Herpetology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Bury, R.B., Fellers, G.M., and Ruth, S.B., 1969, First records of Plethodon dunni in California and new distributional data on Ascaphus truei, Rhyacotriton olympicus, and Hydromantes shastae: Journal of Herpetology, v. 3, no. 3-4, p. 159-161.","productDescription":"p. 159-161","startPage":"159","endPage":"161","numberOfPages":"3","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":130350,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"3","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49f9e4b07f02db5f386e","contributors":{"authors":[{"text":"Bury, R. Bruce buryb@usgs.gov","contributorId":3660,"corporation":false,"usgs":true,"family":"Bury","given":"R.","email":"buryb@usgs.gov","middleInitial":"Bruce","affiliations":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"preferred":false,"id":315722,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fellers, Gary M. 0000-0003-4092-0285 gary_fellers@usgs.gov","orcid":"https://orcid.org/0000-0003-4092-0285","contributorId":3150,"corporation":false,"usgs":true,"family":"Fellers","given":"Gary","email":"gary_fellers@usgs.gov","middleInitial":"M.","affiliations":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"preferred":true,"id":315720,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ruth, Steven B.","contributorId":37685,"corporation":false,"usgs":true,"family":"Ruth","given":"Steven","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":315721,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70010164,"text":"70010164 - 1969 - On the global variations of terrestrial heat-flow","interactions":[],"lastModifiedDate":"2020-03-19T08:23:28","indexId":"70010164","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3071,"text":"Physics of the Earth and Planetary Interiors","active":true,"publicationSubtype":{"id":10}},"title":"On the global variations of terrestrial heat-flow","docAbstract":"Over 3 500 measurements of surface heat-flux have been catalogued and analyzed to study the large-scale variations of terrestrial heat-flow. It was found that heat-flow values are correlated with major geologic provinces: higher averages and scattered values in active tectonic regions, and lower averages and more uniform values in stable areas. Analyzing the data in the light of new global tectonics shows that the variations of heat-flow are consistent with the hypotheses of sea-floor spreading and plate tectonics. The observed heat-flow across the mid-oceanic ridges can be accounted for by a simple model of a spreading sea floor.
","language":"English","publisher":"Elsevier","doi":"10.1016/0031-9201(69)90026-0","issn":"00319201","usgsCitation":"Lee, W., 1969, On the global variations of terrestrial heat-flow: Physics of the Earth and Planetary Interiors, v. 2, no. 5, p. 332-341, https://doi.org/10.1016/0031-9201(69)90026-0.","productDescription":"10 p.","startPage":"332","endPage":"341","numberOfPages":"10","costCenters":[],"links":[{"id":219594,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"2","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6dd3e4b0c8380cd75348","contributors":{"authors":[{"text":"Lee, W.H.K.","contributorId":35303,"corporation":false,"usgs":true,"family":"Lee","given":"W.H.K.","affiliations":[],"preferred":false,"id":358175,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70011564,"text":"70011564 - 1969 - Atomic-absorption determination of rhodium in chromite concentrates","interactions":[],"lastModifiedDate":"2020-11-30T13:25:11.930588","indexId":"70011564","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3517,"text":"Talanta","active":true,"publicationSubtype":{"id":10}},"title":"Atomic-absorption determination of rhodium in chromite concentrates","docAbstract":"Rhodium is determined in chromite concentrates by atomic absorption after concentration either by co-precipitation with tellurium formed by the reduction of tellurite with tin(II) chloride or by fire assay into a gold bead. Interelement interferences in the atomic-absorption determination are removed by buffering the solutions with lanthanum sulphate (lanthanum concentration 1%). Substantial amounts of Ag, Al, Au, Bi, Ca, Cd, Co, Cr, Cu, Fe, Ho, Hg, K, La, Mg, Mn, Mo, Na, Ni, Pb, Te, Ti, V, Y, Zn and platinum metals can be tolerated. A lower limit of approximately 0.07 ppm Rh can be determined in a 3-g sample.
Although Alpine peridotites and basaltic lavas are widely associated in eugeosynclines and oceanic areas, their genetic ties are obscure. Three major characteristics of olivine-rich Alpine peridotite and dunite—relict cumulus textures, aggregated masses of chromitite, and intimate association with magnesium-rich gabbro — cannot be explained by partial melting of garnet peridotite to form tholeiite. Association of magnesium-rich gabbro with the chromite-bearing and so-called high-temperature Alpine peridotites is believed to present problems that have not been considered by advocates of the partial-melting hypothesis. The chromite-bearing Alpine peridotites and related feldspathic rocks are believed to have formed near the top of the mantle by gravitational differentiation processes which are largely independent of the melting processes that produce basaltic magma at depths of 50 km or more.
X-ray analysis of Li+- and K+-saturated samples, differential thermal analysis (DTA), thermal gravimetric analysis (TGA), and chemical analysis of 83 samples enable a distinction to be made between Wyoming, Tatatilla, Otay, Chambers, and non-ideal types of montmorillonite, and between ideal and non-ideal types of beidellite. The Greene-Kelly Li+-test differentiates between the montmorillonites and beidellites. Re-expansion with ethylene glycol after K+-saturation and heating at 300°C depends upon total net layer charge and not upon location of the charge. Wyoming-type montmorillonites characteristically have low net layer charge and re-expand to 17 Å. whereas most other montmorillonites and beidellites have a higher net layer charge and re-expand to less than 17 Å.
Major differences in dehydroxylation temperatures cannot be related consistently to the amount of Al3+-for-Si4+ substitution, nor to the amount of Mg, Fe, type of interlayer cations, or particle size. The major factor controlling temperature of dehydroxylation seems to be the amount of structural (OH). Of 19 samples analyzed by TGA, montmorillonites and the one ideal beidellite that give dehydroxylation endotherms on their DTA curves between 650° and 760°C all contain nearly the ideal amount of 4(OH) per unit cell, but the non-ideal montmorillonites and beidellites that give dehydroxylation peaks between 550° and 600°C do not. Non-ideal beidellites contain more than the ideal amount of structural (OH) and non-ideal montmorillonites seem to contain less, although the low temperature of dehydroxylation of the latter could also be due to other structural defects. Change in X-ray diffraction intensity of the 001 reflection during dehydroxylation suggests that the extra (OH) of beidellite occurs at the apex of SiO4 or AlO4 tetrahedrons with the H+ of the (OH)- polarized toward vacant cation sites in the octahedral sheet.
","language":"English","publisher":"The Clay Minerals Society","doi":"10.1346/CCMN.1969.0170302","usgsCitation":"Schultz, L.G., 1969, Lithium and potassium absorption, dehydroxylation temperature, and structural water content of aluminous smectites: Clays and Clay Minerals, v. 17, no. 3, p. 115-149, https://doi.org/10.1346/CCMN.1969.0170302.","productDescription":"36 p.","startPage":"115","endPage":"149","costCenters":[],"links":[{"id":219501,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"17","issue":"3","noUsgsAuthors":false,"publicationDate":"2024-07-01","publicationStatus":"PW","scienceBaseUri":"505a4822e4b0c8380cd67c2f","contributors":{"authors":[{"text":"Schultz, Leonard Gene","contributorId":19146,"corporation":false,"usgs":true,"family":"Schultz","given":"Leonard","email":"","middleInitial":"Gene","affiliations":[],"preferred":false,"id":357730,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70011563,"text":"70011563 - 1969 - Uranium, thorium, and lead systematics in Granite Mountains, Wyoming","interactions":[],"lastModifiedDate":"2020-11-29T18:03:54.526484","indexId":"70011563","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1427,"text":"Earth and Planetary Science Letters","active":true,"publicationSubtype":{"id":10}},"title":"Uranium, thorium, and lead systematics in Granite Mountains, Wyoming","docAbstract":"Uranium, thorium and lead concentrations and isotopic compositions were determined on total rocks and a feldspar sample from widely separated parts of the Granite Mountains in central Wyoming. Linear relations defined by206Pb/204Pb −207Pb/204Pb and208Pb/204Pb −232Th/204Pb for the total rock samples define 2.8 billion-year isochrons. In contrast,238U/206Pb ages are anomalously old by a factor of at least four. The low238U/204Pb values, coupled with the radiogenic206Pb/204Pb and radiogenic207Pb/204Pb ratios, indicate that contents of uranium in near-surface rocks would have had to have been considerably greater than those presently observed to have generated the radiogenic lead. It is possible that more than 1011 kg of uranium has been removed from the Granite Mountains, and the most feasible interpretation is that most of this uranium was leached from near-surface rocks at some time during the Cenozoic, thus providing a major source for the uranium deposits in the central Wyoming basins.
The Paradox Basin region is approximately bounded by the south flank of the Uinta Basin to the north, the Uncompahgre uplift and San Juan Mountains to the east, the Four Corners structural platform to the southeast, the north rim of the Black Mesa Basin and the Grand Canyon to the south and southwest, and the Wasatch Plateau and Hurricane fault system to the west. Some of these geologic features are areas of ground-water recharge or discharge whereas others such as the Four Corners platform do not directly influence fluid movement. The aquifer systems studied were: (1) Mississippian rocks; (2) Pinkerton Trail Limestone of Wengerd and Strickland, 1954; (3) Paradox Member of the Hermosa Formation; (4) Honaker Trail Formation of Wengerd and Matheny, 1958; (5) Permian rocks.
Recharge in the Paradox Basin occurs on the west flank of the San Juan Mountains and along the west side of the Uncompahgre uplift. The direction of ground-water movement in each analyzed unit is principally southwest-ward toward the topographically low outcrop areas along the Colorado River in Arizona. However, at any point in the basin, flow may be in some other direction owing to the influence of intrabasin recharge areas or local obstructions to flow, such as faults or dikes. A series of potentiometric surface maps was prepared for the five systems studied. Material used in construction of the maps included outcrop altitudes of springs and streams, drill-stem tests, water-well records, and an electric analog model of the entire basin. Many structurally and topographically high areas within the basin are above the regional potentiometric surface; recharge in these areas will drain rapidly off the high areas and adjust to the regional water level.
With a few exceptions, most wells in formations above the Pennsylvanian contain fresh (< 1,000 mg/l T.D.S.2) to moderately saline (< 10,000 mg/l T.D.S.) water. In only a few cases are true brines (> 35,000 mg/l T.D.S.) reported. Most water samples from strata below the Permian are brines of the sodium chloride type but with large amounts of calcium sulfate or calcium chloride type water commonly occurring. Because evaporite facies occur in the Paradox Member, this unit has brines with as much as 400,000 mg/l dissolved solids content.
Previous analysis of the San Juan Basin has indicated the presence of an osmotic membrane system. The highly permeable Jurassic formations were postulated to be the outflow side of the membrane. It is also possible that the Upper Paleozoic units with known brines and with an otherwise inexplicably high potentiometric surface in the Four Corners area of New Mexico could be the outflow receptors of the San Juan membrane system.
","language":"English","publisher":"Elsevier","doi":"10.1016/0009-2541(69)90050-3","issn":"00092541","usgsCitation":"Hanshaw, B., and Hill, G., 1969, Geochemistry and hydrodynamics of the Paradox Basin region, Utah, Colorado and New Mexico: Chemical Geology, v. 4, no. 1-2, p. 263-294, https://doi.org/10.1016/0009-2541(69)90050-3.","productDescription":"32 p.","startPage":"263","endPage":"294","numberOfPages":"32","costCenters":[],"links":[{"id":221376,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Colorado, New Mexico, Utah","otherGeospatial":"Paradox Basin region","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -110.390625,\n 34.32529192442733\n ],\n [\n -105.40283203124999,\n 34.32529192442733\n ],\n [\n -105.40283203124999,\n 39.30029918615029\n ],\n [\n -110.390625,\n 39.30029918615029\n ],\n [\n -110.390625,\n 34.32529192442733\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"4","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a16d4e4b0c8380cd55295","contributors":{"authors":[{"text":"Hanshaw, B.B.","contributorId":25928,"corporation":false,"usgs":true,"family":"Hanshaw","given":"B.B.","email":"","affiliations":[],"preferred":false,"id":361446,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hill, G.A.","contributorId":83666,"corporation":false,"usgs":true,"family":"Hill","given":"G.A.","email":"","affiliations":[],"preferred":false,"id":361447,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70011568,"text":"70011568 - 1969 - Loss of uranium from crystallized silicic volcanic rocks","interactions":[],"lastModifiedDate":"2020-11-29T18:01:11.197284","indexId":"70011568","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1427,"text":"Earth and Planetary Science Letters","active":true,"publicationSubtype":{"id":10}},"title":"Loss of uranium from crystallized silicic volcanic rocks","docAbstract":"Dense primarily crystallized silicic groundmass material from two welded ash-flow units and one lava flow of Tertiary age from the Western United States contain only 20 to 60 percent of the uranium present in nonhydrated glass from the rock units. These differences reflect loss of uranium from the crystallized specimens, probably as a result of groundwater leaching. It appears likely that most crystallized silicic volcanic rocks have lost comparable amounts of uranium.
The melting relations of FeFeS mixtures covering the composition range from Fe to Fe67S33 have been determined at 30 kb pressure. The phase relations are similar to those at low pressure. The eutectic has a composition of Fe72.9S27.1 and a temperature of 990°C. Solubility of S in Fe at elevated temperatures at 30 kb is of the same order of magnitude as at low pressure. Sulfur may have significantly lowered the melting point of iron in the upper mantle during the period of coalescence of metal prior to core formation in the primitive earth.
Chemical analyses of approximately 1,881 samples of water from selected Kansas brines define the variations of water chemistry with depth and aquifer age. The most concentrated brines are found in the Permian rocks which occupy the intermediate section of the geologic column of this area. Salinity decreases below the Permian until the Ordovician (Arbuckle) horizon is reached and then increases until the Precambrian basement rocks are reached. Chemically, the petroleum brines studied in this small area fit the generally accepted pattern of an increase in calcium, sodium and chloride content with increasing salinity. They do not fit the often-predicted trend of increases in the calcium to chloride ratio, calcium content and salinity with depth and geologic age. The calcium to chloride ratio tends to be asymptotic to about 0.2 with increasing chloride content. Sulfate tends to decrease with increasing calcium content. Bicarbonate content is relatively constant with depth.
If many of the hypotheses concerning the chemistry of petroleum brines are valid, then the brines studied are anomolous. An alternative lies in accepting the thesis that exceptions to these hypotheses are rapidly becoming the rule and that indeed we still do not have a valid and general hypothesis to explain the origin and chemistry of petroleum brines.
","language":"English","publisher":"Elsevier","doi":"10.1016/0009-2541(69)90053-9","issn":"00092541","usgsCitation":"Dingman, R., and Angino, E., 1969, Chemical composition of selected Kansas brines as an aid to interpreting change in water chemistry with depth: Chemical Geology, v. 4, no. 1-2, p. 325-339, https://doi.org/10.1016/0009-2541(69)90053-9.","productDescription":"15 p.","startPage":"325","endPage":"339","numberOfPages":"15","costCenters":[],"links":[{"id":221044,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United 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\"}}]}","volume":"4","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f569e4b0c8380cd4c1f7","contributors":{"authors":[{"text":"Dingman, R.J.","contributorId":40645,"corporation":false,"usgs":true,"family":"Dingman","given":"R.J.","email":"","affiliations":[],"preferred":false,"id":361070,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Angino, E.E.","contributorId":8972,"corporation":false,"usgs":true,"family":"Angino","given":"E.E.","email":"","affiliations":[],"preferred":false,"id":361069,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70011467,"text":"70011467 - 1969 - Formation of halloysite from feldspar: Low temperature, artificial weathering versus natural weathering","interactions":[],"lastModifiedDate":"2018-01-25T14:37:21","indexId":"70011467","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1245,"text":"Clays and Clay Minerals","onlineIssn":"1552-8367","printIssn":"0009-8604","active":true,"publicationSubtype":{"id":10}},"title":"Formation of halloysite from feldspar: Low temperature, artificial weathering versus natural weathering","docAbstract":"Weathering products formed on surfaces of both potassium and plagioclase feldspar (An70), which were continuously leached in a Soxhlet extraction apparatus for 140 days with 7.21 of distilled water per day at a temperature of approximately 78°C, are morphologically identical to natural products developed on potassium feldspars weathered under conditions of good drainage in the humid tropics. The new products, which first appear as tiny bumps on the feldspar surface, start to develop mainly at exposed edges but also at apparently random sites on flat cleavage surfaces. As weathering continues, the bumps grow outward from the feldspar surface to form tapered projections, which then develop into wide-based thin films or sheets. The thin sheets of many projections merge laterally to form one continuous flame-shaped sheet. The sheets formed on potassium feldspars may then roll to form tubes that are inclined at a high angle to the feldspar surface. Etch pits of triangular outline on the artificially weathered potassium feldspars serve as sites for development of continuous, non-rolled, hollow tubes. It is inferred from its morphology that this weathering product is halloysite or its primitive form. The product of naturally weathered potassium feldspars is halloysite . 4H2O.
The flame-shaped films or sheets formed on artificially weathered plagioclase feldspar do not develop into hollow tubes, but instead give rise to a platy mineral that is most probably boehmite. These plates form within the flame-shaped films, and with continued weathering are released as the film deteriorates. There is no indication from this experiment that platy pseudohexagonal kaolinite forms from any of these minerals under the initial stage of weathering.
","language":"English","publisher":"The Clay Minerals Society","doi":"10.1346/CCMN.1969.0170104","usgsCitation":"Parham, W.E., 1969, Formation of halloysite from feldspar: Low temperature, artificial weathering versus natural weathering: Clays and Clay Minerals, v. 17, no. 1, p. 13-22, https://doi.org/10.1346/CCMN.1969.0170104.","productDescription":"10 p.","startPage":"13","endPage":"22","costCenters":[],"links":[{"id":221753,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"17","issue":"1","noUsgsAuthors":false,"publicationDate":"2024-07-01","publicationStatus":"PW","scienceBaseUri":"505a1350e4b0c8380cd545eb","contributors":{"authors":[{"text":"Parham, Walter E.","contributorId":58022,"corporation":false,"usgs":false,"family":"Parham","given":"Walter","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":361181,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70010799,"text":"70010799 - 1969 - The relationship of the rare-earth composition of minerals to geological environment","interactions":[],"lastModifiedDate":"2020-11-29T18:40:05.657968","indexId":"70010799","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"The relationship of the rare-earth composition of minerals to geological environment","docAbstract":"It has been known for a long time that the composition of the lanthanides in minerals is controlled to a large degree by crystallo-chemical factors, but is also greatly influenced by changes in geological environment. In general, igneous rocks rich in silica are favourable for the concentration of the heavy lanthanides and yttrium; those low in silica and high in carbonate are favourable for the concentration of the light lanthanides.
These generalizations are illustrated by summaries of the available data on monazite, sphene, and apatite from different geological environments. Apatite of marine sedimentary origin (a large potential source of rare earths) shows marked depletion of cerium, as has been noted previously for sea water.
","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(69)90118-5","issn":"00167037","usgsCitation":"Fleischer, M., and Altschuler, Z., 1969, The relationship of the rare-earth composition of minerals to geological environment: Geochimica et Cosmochimica Acta, v. 33, no. 6, p. 725-732, https://doi.org/10.1016/0016-7037(69)90118-5.","productDescription":"8 p.","startPage":"725","endPage":"732","numberOfPages":"8","costCenters":[],"links":[{"id":218803,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"33","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505baf27e4b08c986b3245ae","contributors":{"authors":[{"text":"Fleischer, M.","contributorId":84069,"corporation":false,"usgs":true,"family":"Fleischer","given":"M.","email":"","affiliations":[],"preferred":false,"id":359675,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Altschuler, Z. S.","contributorId":42962,"corporation":false,"usgs":true,"family":"Altschuler","given":"Z. S.","affiliations":[],"preferred":false,"id":359674,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70010800,"text":"70010800 - 1969 - Pyrolysis of humic and fulvic acids","interactions":[],"lastModifiedDate":"2020-11-29T18:38:01.655442","indexId":"70010800","displayToPublicDate":"1969-01-01T00:00:00","publicationYear":"1969","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"Pyrolysis of humic and fulvic acids","docAbstract":"Pyrolysis of humic and fulvic acids isolated from a North Carolina soil yields a variety of aromatic, heterocyclic and straight chain organ compounds. The pyrolysis products identified by gas chromatography and mass spectrometry indicate that humic and fulvic acids have aromatic and polysaccharide structures in their molecules.