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\"}}]}","volume":"119","issue":"3097","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a73b8e4b0c8380cd771d8","contributors":{"authors":[{"text":"Sohn, I. G.","contributorId":70751,"corporation":false,"usgs":true,"family":"Sohn","given":"I.","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":360083,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70011006,"text":"70011006 - 1954 - Stromatolite classification in the belt series","interactions":[],"lastModifiedDate":"2026-03-06T15:01:46.289424","indexId":"70011006","displayToPublicDate":"1954-05-07T00:00:00","publicationYear":"1954","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3338,"text":"Science","active":true,"publicationSubtype":{"id":10}},"title":"Stromatolite classification in the belt series","docAbstract":"No abstract available.
","language":"English","publisher":"American Association for the Advancement of Science","doi":"10.1126/science.119.3097.659.a","issn":"00368075","usgsCitation":"Rezak, R., 1954, Stromatolite classification in the belt series: Science, v. 119, no. 3097, p. 659-659, https://doi.org/10.1126/science.119.3097.659.a.","productDescription":"1 p.","startPage":"659","endPage":"659","costCenters":[],"links":[{"id":221634,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Montana","otherGeospatial":"northwestern Montana","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -116.17674091307038,\n 49.032340202715545\n ],\n [\n -116.06008476532119,\n 47.8152158547081\n ],\n [\n -114.6373491395932,\n 46.47441459683523\n ],\n [\n -110.39984152924069,\n 46.528088988634494\n ],\n [\n -110.39984152924069,\n 49.032340202715545\n ],\n [\n -116.17674091307038,\n 49.032340202715545\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"119","issue":"3097","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9b7ee4b08c986b31cf12","contributors":{"authors":[{"text":"Rezak, R.","contributorId":105051,"corporation":false,"usgs":true,"family":"Rezak","given":"R.","affiliations":[],"preferred":false,"id":360077,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70221460,"text":"70221460 - 1954 - Sedimentary facies of iron-formation","interactions":[],"lastModifiedDate":"2021-06-16T15:56:48.830475","indexId":"70221460","displayToPublicDate":"1954-05-01T10:54:00","publicationYear":"1954","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1472,"text":"Economic Geology","active":true,"publicationSubtype":{"id":10}},"title":"Sedimentary facies of iron-formation","docAbstract":"The sedimentary iron-formations of Precambrian age in the Lake Superior region can be divided on the basis of the dominant original iron mineral into four principal facies: sulfide, carbonate, oxide, and silicate. As chemical sediments, these rocks reflect certain aspects of the chemistry of the depositional environments. The major control, at least for the sulfide, carbonate, and oxide types, probably was the oxidation potential. The evidence indicates that deposition took place in restricted basins, which were separated from the open sea by thresholds that inhibited free circulation and permitted development of abnormalities in oxidation potential and water composition. The sporadic distribution of metamorphism and of later oxidation permits description of the primary facies on the basis of unoxidized, essentially unmetamorphosed material. The sulfide facies is represented by black slates in which pyrite may make up as much as 40 percent of the rock. The free-carbon content of these rocks typically ranges from 5 to 15 percent, indicating that ultra-stagnant conditions prevailed during deposition. Locally, the pyritic rocks contain layers of iron-rich carbonate. The carbonate facies consists, in its purer form, of interbedded iron-rich carbonate and chert. It is a product of an environment in which oxygen concentration was sufficiently high to destroy most of the organic material but not high enough to permit formation of ferric compounds. The oxide facies is found as two principal types, one characterized by magnetite and the other by hematite. Both minerals appear to be of primary origin. The magnetite-banded rock is one of the dominant lithologies in the region; it consists typically of magnetite interlayered with chert, carbonate, or iron silicate, or combinations of the three. Its mineralogy and association suggest origin under weakly oxidizing to moderately reducing conditions, but the mode of precipitation of magnetite is not clearly understood. The hematite-banded rocks consist of finely crystalline hematite interlayered with chert or jasper. Oolitic structure is common. This facies doubtless accumulated in a strongly oxidizing, probably near-shore, environment similar to that in which younger hema-titic ironstones such as the Clinton oolite were deposited. The silicate facies contains one or more of the hydrous ferrous silicates (greenalite, minnesotaite, stilpnomelane, chlorite) as a major constituent. Granule structure, similar to that of glauconite, is typical of some varieties; others are nongranular and finely laminated. The most common association of the silicate rocks is with either carbonate- or magnetite-bearing rocks, which suggests that the optimum conditions for deposition ranged from slightly oxidizing to slightly reducing. The relationship between the iron-rich rocks and volcanism, stressed by many authors, is considered by the writer to be structural, not chemical: in the Lake Superior region both iron-deposition and volcanism are believed to be related to geosynclinal development during Huronian time. In Michigan, the lower Huronian rocks are iron-poor quartzite and dolomite-typical \"stable-shelf\" deposits; much of the upper Huronian consists of iron-poor graywacke and slate with associated volcanic rocks -a typical \"geosynclinal\" assemblage. Thus the iron-rich beds of the middle Huronian and lower part of the upper Huronian were deposited during a transitional stage in structural history. The major environmental requirement for deposition of iron-formation is the closed or restricted basin; this requirement coincides in time with what would be a normal stage in evolution of the geosyncline: namely, structural development of offshore buckles or swells that subsequently develop into island arcs characterized by volcanism.
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","language":"English","publisher":"American Association for the Advancement of Science","doi":"10.1126/science.119.3096.617","issn":"00368075","usgsCitation":"Burnside, R.J., Stafford, P., and Myers, D., 1954, Geological Survey investigations of the Scurry reef and \"Horseshoe atoll\" in western Texas: Science, v. 119, no. 3096, p. 617-618, https://doi.org/10.1126/science.119.3096.617.","productDescription":"2 p.","startPage":"617","endPage":"618","costCenters":[],"links":[{"id":219244,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Texas","otherGeospatial":"Horseshoe atoll, western Texas","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -102.78299577927328,\n 33.23524956309734\n ],\n [\n -102.78299577927328,\n 32.2790446661252\n ],\n [\n -101.22542719562824,\n 32.2790446661252\n ],\n [\n -101.22542719562824,\n 33.23524956309734\n ],\n [\n -102.78299577927328,\n 33.23524956309734\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"119","issue":"3096","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a2228e4b0c8380cd56dd8","contributors":{"authors":[{"text":"Burnside, R. J.","contributorId":74435,"corporation":false,"usgs":true,"family":"Burnside","given":"R.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":359272,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stafford, P.T.","contributorId":85243,"corporation":false,"usgs":true,"family":"Stafford","given":"P.T.","email":"","affiliations":[],"preferred":false,"id":359273,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Myers, D.A.","contributorId":22804,"corporation":false,"usgs":true,"family":"Myers","given":"D.A.","email":"","affiliations":[],"preferred":false,"id":359271,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70011010,"text":"70011010 - 1954 - Modification of the glacial chronology of the San Juan Mountains, Colorado","interactions":[],"lastModifiedDate":"2026-03-06T15:32:24.322687","indexId":"70011010","displayToPublicDate":"1954-04-30T00:00:00","publicationYear":"1954","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3338,"text":"Science","active":true,"publicationSubtype":{"id":10}},"title":"Modification of the glacial chronology of the San Juan Mountains, Colorado","docAbstract":"No abstract available.
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