Download or read book Faunas and Stratigraphy of the Snowy Range Formation Upper Cambrian in Southwestern Montana and Northwestern Wyoming written by Richard E. Grant and published by Geological Society of America. This book was released on 1965 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Faunas and Stratigraphy of the Snowy Range Formations Upper Cambrian in Southwestern Montana and Northwestern Wyoming written by Richard E. Grant and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Faunas and Stratigraphy of the Snowy Range Formation Upper Cambrian in Southwestern Montana and Southwestern Wyoming by Richard E Grant written by Richard E. Grant and published by . This book was released on 1965 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cambrian Faunas of the Snowy Range Formation Southwestern Montana and Northwestern Wyoming written by Richard E. Grant and published by . This book was released on 1958 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fossils and rock samples were collected from the Snowy Range formation (Cambrian) at 24 sections measured in the Horseshoe Hills and Bridger Mountains of Montana and 8 sections in the vicinity of Yellowstone National Park in Montana and Wyoming. Where the Snowy Range formation is overlain by the Maywood unit (Devonian), both were measured and sampled, although the Maywood proved to be unfossiliferous. Lowermost of the 3 members of the Snowy Range formation is the Dry Creek shale which lies conformably on the Pilgrim limestone. It consists of about 50 feet of purplish, thin bedded, fissile to slightly plastic shale with a few irregular beds of brownish gray, platy, dolomitic siltstone in the lower three-fourths, and some thin beds of silty limestone or limestone-pebble conglomerate in the upper quarter. No evidence is present in this area for subaerial erosion between the Pilgrim and Snowy Range formations, although beds of siltstone in the Dry Creek may reflect uplift and erosion at the source of terrigenous sediments. The middle member is the Sage, which averages about 200 feet thick where complete. Its base is marked at most localities by a one to 20 foot bioherm of columnar algal limestone; the remainder is a fairly regular alternation of one to two foot beds of limestone or limestone pebble conglomerate with 2 to 4 foot beds of green shale or very argil laceous greenish gray limestone. The upper part contains beds of non columnar algal limestone. This member was deposited far from shore in shallow turbid water that contained abundant calcium in solution. Microcrystalline calcite ooze, along with fine fragments of fossils arri fecal pellets, collected in ripple troughs and other depressions in the mud of the sea floor. These small accumulations became sufficiently consolidated to maintain coherence when excavated by currents that swept away clay particles and concentrated these consolidated limestone "pods" into beds that later were cemented to form limestone-pebble conglomerate. The uppermost member, the Grove Creek, is nowhere complete in this area; the upper part was removed by erosion at some localities and by faulting at others. The member consists of about 25 feet of dolomitized limestone-pebble or cobble conglomerate with intercalated beds of dolomitized gray splintery shale. This member owes much of its distinctive character to weathering that took place before deposition of the Upper Ordovician Bighorn formation. The Maywood unit is a Devonian soil or weathered zone that overlies some part of the Snowy Range formation in the northwestern part of the area of study, but overlies formations as low as those in the Precambrian Belt Series or as high as the Upper Ordovician Bighorn formation in other parts of Montana. It consists of a greatly varying thickness (averaging about 55 feet) of reddish orange or brown, thin bedded, silty dolomite or dolomitic limestone. At a few localities it is coarse grained, thick bedded, light brown dolomite. No fossils were found in the Maywood in the area studied, but Devonian fossils have been collected from it in other parts of Montana. Fossils described from the Snowy Range formation are trilobites (80 species in 48 genera: Aphelaspis whitfordi, Pinctus artus, P. pullus, Taenicephalus gallupensis, Saratogia carita, Monocheilus demissus, and Homagnostus insolitus are new species, Comanchia amplooculata lippa is a new subspecies, and Simbaltea is a new generic name for Kendallia Raasch, which is preoccupied); brachiopods (20 species in 14 genera: Angulotreta glabra. A. vescula and A. catheta are new species, Huenella taxana var. fortis and Eoorthis remnicha var. A are new varieties); gas tropods (4 species in 4 genera, none new); sponges (one species); graptolites (one species); unidentifiable pelmatozoan fragments; miscellaneous problematica; algal limestone (two form-species). Fossil species in the Snowy Range formation are assigned to local zones, based on ranges of genera and species of trilobites, which can be correlated with standard zones of the Cambrian Correlation Chart or local zones of other areas. A few species that occur near the base of the formation belong to the Aphelaspis and "post-Aphelaspist" zones of the Dresbachian Stage and are equivalent to the Aphelaspis zone of the Chart and the Aphelaspis and "post-Aphelaspis" zones of Texas. Most species in the formation belong to one or more zones of the Franconian Stage. Lowermost of these is the Elvinia zone (with Camaraspis subzone and Irvingella major zonule in the upper part) which corresponds to the Elvinia zone of the Cambrian Correlation Chart. Next higher is the Taenicephalus zone (with Parabolinoides subzone at base) which correlates with the Conaspis zone of the Chart. Above this is the Idahoia zone (with basal I. wyomingensis subzone, middle I. wisconsensis sub zone and upper I. serapio subzone) which correlates with the Ptychaspis subzone of the Ptychaspis-Prosaukia zone of the Chart. The uppermost zone of the Franconian is the Prosaukia zone, which is equivalent to the Prosaukia subzone of the Chart. Species of the Trempealeauan Stage are assigned to the Illaenurus zone, which corresponds to the Lower Trempealeauan of Texas or the lower part of the Saukia zone of the Upper Mississippi Valley. An alternative zonation is offered, based on the ranges of genera and species of brachiopods. Boundaries of most brachiopod zones fall at the levels of the boundaries of trilobite zones, but some do not. The Apsotreta expansa zone is equivalent to the "post-Aphelaspis" zone of the Dresbachian Stage. The Linnarssonella zone and the Angulotreta tetonensis zone (with Ceratreta-Eoorthia subzone at base) correspond respectively to the Elvinia and Taenicephalus zones of the lower part of the Franconian Stage. The Angulotreta vescula zone corresponds to all but the uppermost part of the Idahoia zone, and the A. catheta zone (with Finkelnburgia osceola subzone at top) is equivalent to this uppermost part of the Idahoia zone and the entire Prosaukia zone of the Franconian Stage as well as the totality of the Illaenurus zone of the Trempealeauan Stage. Thus no Franconian-Trempealeauan boundary is apparent in the brachiopod zonation
Download or read book Geology of the Varney and Cameron Quadrangles Madison County Montana written by Jarvis Bardwell Hadley and published by . This book was released on 1980 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Bulletin written by and published by . This book was released on 1978 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Short Papers for the Second International Symposium on the Cambrian System 1981 written by and published by . This book was released on 1981 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1982 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1972 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Great American Carbonate Bank written by James Derby and published by AAPG. This book was released on 2013-01-20 with total page 1229 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardcover plus DVD
Download or read book Geological Survey Professional Paper written by Geological Survey (U.S.) and published by . This book was released on 1974 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology of the Tepee Creek Quadrangle Montana Wyoming written by Irving Jerome Witkind and published by . This book was released on 1969 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: A description of the stratigraphy, structure, and surficial deposits in a 15-minute quadrangle that includes the meizoseismal area of the Hebgen Lake earthquake of August 17, 1959.
Download or read book Phanerozoic Diversity Patterns written by J. Valentine and published by Princeton University Press. This book was released on 2014-07-14 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here twenty-one leading paleontologists use important refinements in fossil diversity data to provide critical evaluations of older hypotheses of diversification and extinction processes and to propose fresh interpretations. Originally published in 1986. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Download or read book Paleozoic and Mesozoic Stratigraphy of the Northern Part of the Ruby Range Southwestern Montana written by Russell G. Tysdal and published by . This book was released on 1976 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossils Phylogeny and Form written by Jonathan M. Adrain and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phylogenetic analysis and morphometrics have been developed by biologists into rigorous analytic tools for testing hypotheses about the relationships between groups of species. This book applies these tools to paleontological data. The fossil record is our one true chronicle of the history of life, preserving a set of macroevolutionary patterns; thus various hypotheses about evolutionary processes can be tested in the fossil record using phylogentic analysis and morphometrics. The first book of its type, Fossils, Phylogeny, and Form will be useful in evolutionary biology, paleontology, systematics, evolutionary development, theoretical biology, biogeography, and zoology. It will also provide a practical, researcher-friendly gateway into computer-based phylogenetics and morphometrics.
Download or read book Bibliography of North American Geology written by and published by . This book was released on 1965 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.
Download or read book Quantifying the Evolution of Early Life written by Marc Laflamme and published by Springer Science & Business Media. This book was released on 2011-02-28 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a detailed description of a wide range of numerical, statistical or modeling techniques and novel instrumentation separated into individual chapters written by paleontologists with expertise in the given methodology. Each chapter outlines the strengths and limitations of specific numerical or technological approaches, and ultimately applies the chosen method to a real fossil dataset or sample type. A unifying theme throughout the book is the evaluation of fossils during the prologue and epilogue of one of the most exciting events in Earth History: the Cambrian radiation.
