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30 records · Page 2Linked to original sources
USGS1878

Bulletin of the United States Geological and Geographical Survey of the Territories: Volume IV, Number 3

Table of Contents ART. XXV.----Field-notes on Birds observed in Dakota and Montana along the Forty-ninth Parallel during the seasons of 1873 and 1874. By Dr. Elliott Coues, U.S.A., late Surgeon and Naturalist U.S. Northern Boundary Commission.....545-662 ART. XXVI.----Notes on a Collection of Fishes from the Rio Grande, at Brownsville, Texas-Continued. By D.S. Jordan, M.D......663-668 ART. XXVII.---Preliminary Studies on the North American Pyralidae. I. By A.R. Grote..... 669-706 ART. XXVIII.--Paleontological Papers No.6: Descriptions of New Species of Invertebrate Fossils from the Laramie Group. By C.A. White, M.D......707-720 ART. XXIX.----Paleontological Papers No.7: On the Distribution of Molluscan Species in the Laramie Group. By C. A. White, M.D......721-724 ART. XXX.-----On some Dark Shale recently discovered below the Devonian Limestones, at Independence, Iowa\; with a Notice of its Fossils and Description of New Species. By S. Calvin, Professor of Geology, State University of Iowa.....725-730 ART. XXXI.----On the Mineralogy of Nevada. By W.J. Hoffman, M.D......731-745

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USGS1997

Paleogeographic significance of Clavohamulus hintzei Miller (Conodonta) and other Ibexian conodonts in an early Paleozoic carbonate platform facies of the Argentine Precordillera

Pre-Tremadocian conodonts and trilobites and Tremadocian conodonts are reported from the Cambrian and Ordovician La Silla Formation in the Cerro La Silla section in east-southeast Ja??chal, San Juan Province, Argentina. A shallow marine conodont fauna contains elements of Clavohamulus hintzei Miller, a common species in North America, but reported for the first time from the early Paleozoic platform carbonates of the western Argentine Precordillera. The presence of this species suggests a correlation with the Clavohamulus hintzei conodont subbiozone of the Cordylodus intermedius conodont biozone in North America, considered Early Ordovician (Skullrockian Stage, Ibexian Series) in North America, but by South American and European standards, this biozone would be of latest Cambrian age. C. hintzei and associated conodonts of the La Silla Formation are typical of the tropical faunas of the North American Midcontinent Faunal Province; Late Cambrian trilobites from lower in the formation also are typical North American taxa. The presence of these faunas in the platform carbonates is consistent with plate reconstructions suggesting that the Precordillera was in a tropical or subtropical position close to Laurentia during the late Precambrian and early Paleozoic. These new paleontological data provide one more argument for recent models of the Precordillera as a displaced terrane derived from the Ouachita Embayment at the southern margin of Laurentia.

Geological Society of America Bulletin↗
USGS1923

Geologic literature on North America, 1785-1918; Part I, Bibliography

The bibliography forming Part I of this compilation includes papers relating to the geology paleontology, petrology, and mineralogy of North America-specifically, the United States, the Dominion of Canada and Newfoundland, the Arctic regions north of the continent, Greenland, Mexico Central America, Panama, and the West Indies including Trinidad-and also the Hawaiian Islands. Geographic and descriptive writings and accounts of travels with incidental mention of geologic facts are not included. Textbooks published in America and work general in character by American authors are given but general papers by foreign writers are excluded unless they have appeared in American publications. Papers by American writers on the geology of other parts of the world are not listed.

Bulletin↗
USGS1957

Franciscan group in Coast Ranges and its equivalents in Sacramento Valley, California

The Franciscan group is an assemblage of detrital and chemical sedimentary and volcanic rocks that crops out discontinuously in a structurally complex, northwesterly trending belt along the Coast Ranges of Cahfornia. On the east, along the west side of the Sacramento Valley, a thick section of detrital sedimentary rocks has been subdivided into the Knoxville, Paskenta, and Horsetown forma tions of Late Jurassic and Early Cretaceous age, and several units of early Late Cretaceous age. The Sacramento Valley section represents deposition during most of the time from Late Jurassic to early Late Cretaceous. The Franciscan group is widely held to be restricted to Late Jurassic age, the Knoxville formation to be an upper shaly phase of the Franciscan group, and the two to be overlain unconformably by detrital strata of Cretaceous age. Sparse paleontologic evidence indicates this view to be incorrect. Rather, the Franciscan group seems mainly to have been deposited contemporaneously with the Knoxville, Paskenta, Horsetown, and lower Upper Cretaceous strata, as fossils ranging from Late Jurassic to early Late Cretaceous in age have been found in the Franciscan group. The Franciscan group and strata of the Sacramento Valley section therefore may represent two fades of the same stratigraphic section.

California↗
USGS1878

Bulletin of the United States Geological and Geographical Survey of the Territories: Volume IV, Number 4

Table of Contents ART. XXXII.---The Fossil Insects of the Green River Shales. By Samuel H. Scudder, Cambridge, Mass.....747-776 ART. XXXIII.---Report on the Collection of Fishes made by Dr. Elllott Cones, U.S.A., in Dakota and Montana, during the seasons of 1873 and 1874. By DavidS. Jordan, M.D......777-800 ART. XXXIV.----Catalogue of Phraenogamous and Vascular Cryptogamous Plants collected during the summers of 1873 and 1874, in Dakota and Montana, along the forty-ninth parallel, by Dr. Elliott Cones, U.S.A.; with which are incorporated those collected in the same region at the same times by Mr. George M. Dawson. By Prof. J. W. Chickering.....801-830 ART. XXXV.-----On some Striking Products of Erosion in Colorado. By F.M. Endlich, S.N.D......831-864 ART. XXXVI.----Paleontological Papers No.8: Remarks upon the Laramie Group. By C.A. White, M.D......865-876 ART. XXXVII.---Synonymatic List of the American Sciuri, or Arboreal Squirrels. By J.A. Allen. (See p. 905.).....877-887 Index.....889-908

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USGS1973

Revised age and structural interpretations of Nuka Formation at Nuka Ridge, northwestern Alaska: Geologic notes

New collections of foraminifers and macrofossils from Nuka Ridge, the type area of the enigmatic Nuka Formation, demonstrate that the type Nuka Formation is not a continuous stratigraphic sequence as originally described. Paleontologic evidence indicates the presence of a structurally repeated sequence at Nuka Ridge consisting of Upper Mississippian (Meramec and younger) strata overlain by Permian beds which, in turn, are succeeded by Triassic(?) and Cretaceous rocks. Mississippian calcareous mudstone and limestone units are correlated with the Lisburne Group; microcline-bearing arkose units with Mississippian and Permian macrofossils and microfossils represent the Nuka Formation; units of chert are inferred to be of Permian and Triassic age; and wacke at the top of the sequence resembles unnamed wacke assigned to the Cretaceous elsewhere. These new data and their interpretations indicate that the type section of the Nuka Formation is inadequate. The standard for the Nuka Formation is therefore referred to a newly measured section of the middle arkosic unit of the old section.

Alaska↗
USGS1961

Correlation of tertiary formations of Alaska

Recent stratigraphic and paleontologic studies have resulted in substantial revision of the age assignments and inter-basin correlations of the Tertiary formations of Alaska as given in both an earlier compilation by P. S. Smith (1939) and a tentative chart prepared for distribution at the First International Symposium on Arctic Geology at Calgary, Alberta (Miller, MacNeil, and Wahrhaftig, 1960). Current work in Alaska by the U. S. Geological Survey and several oil companies is furnishing new information at a rapid rate and further revisions may be expected. The correlation chart (Fig. 1), the first published chart to deal exclusively with the Tertiary of Alaska, had the benefit of a considerable amount of stratigraphic data and fossil collections from some oil companies, but recent surface mapping and drilling by other oil companies in several Tertiary basins undoubtedly must have produced much more information. Nevertheless, the extent of available data justifies the publication of a revised correlation chart at this time.

Alaska↗