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Author: Charles Abiathar White
Publisher:
ISBN:
Category : Invertebrates, Fossil
Languages : en
Pages : 148
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This bibliographical record has been prepared for the purpose of conveying to the public a brief general view of the work that has hitherto been done in the Invertebrate Paleontology of North America, and also of furnishing students and investigators with a ready index to the works of all the authors who have made contributions to it.
Author: Charles Abiathar White
Publisher:
ISBN:
Category : Invertebrates, Fossil
Languages : en
Pages : 148
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Book Description
This bibliographical record has been prepared for the purpose of conveying to the public a brief general view of the work that has hitherto been done in the Invertebrate Paleontology of North America, and also of furnishing students and investigators with a ready index to the works of all the authors who have made contributions to it.
Author: Julia Anna Gardner
Publisher:
ISBN:
Category : Gastropoda, Fossil
Languages : en
Pages : 310
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Author: Maryland Geological Survey
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 412
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Author: H. Alleyne Nicholson
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Author: John Belknap Marcou
Publisher:
ISBN:
Category : Invertebrates, Fossil
Languages : en
Pages : 348
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Author: William Bullock Clark
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 648
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Author: Joint Committee on Invertebrate Paleontology
Publisher:
ISBN:
Category : Invertebrates, Fossil
Languages : en
Pages :
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Author: Raymond C. Moore
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 568
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Author: C. A. White
Publisher:
ISBN: 9781332305896
Category : Science
Languages : en
Pages : 34
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Excerpt from Preliminary Report Upon Invertebrate Fossils: Collected by the Expeditions of 1871, 1872, and 1873, With Descriptions of New Species Length of the body in proportion with the width variable; in some specimens (perhaps broken ones) the length and width being about equal, while in others the length is two or three times as great as the width. The width, in different specimens, varies from three and a half to upward of four centimeters. Position and locality. - Same as the last. Brachiopoda. Genus Acrotreta Kutorga. Acrotreta? Subsidua (sp. nov.) - Shell thin, corneous, discoid, subcircular or slightly suboval in outline, the transverse diameter being a trifle greater than the longitudinal; sides regularly and front broadly rounded; posterior margin slightly straightened, forming a comparatively short, slightly convex, or nearly straight hinge-line. Dorsal valve nearly flat; beak marginal, not prominent. Interior with a slightly-raised median ridge, beginning beneath the beak, and extending to about the middle of the valve, where it disappears; impressions of the posterior adductor muscles small and placed nearly beneath the beak, one on each side of the median ridge; between these muscular impressions and the posterior margin there is, at each side, an obscure diverging ridge or fold. Ventral valve moderately convex in the umbonal region, but more flattened anteriorly; apex excentric, somewhat prominent and minutely perforate; adductor impressions small and placed in the apex close to the foramen, one at each side of it. One of the specimens shows a slight flattening of the triangular space between the apex and the hinge-line, which appears like an indistinctly-defined cardinal area. This shell differs so widely in shape from the typical forms of Acrotreta, although it seems to possess its other essential characteristics, that I have referred it only provisionally to that genus. Length of the largest specimen, six millimeters; width, seven millimeters. Position and locality. - Strata probably of the epoch of the Potsdam Sandstone, Antelope Spring, House range, Utah. Genus Trematis Sharpe. Trematis Pannulus (sp. nov.) - Shell small, subcircular; ventral valve moderately convex; apex prominent, excentric; surface marked by a very fine net-work of oblique, raised lines, dividing it up into minute four-sided pore-like pits, which cause it to resemble, under a lens, finelywoven cloth. Diameter of the valve, about three millimeters. Position and locality. - Shales of the Potsdam epoch, Pioche, Nevada. Pteropoda. Genus Hyolithes Eichwald. Hyolithes Primordialis Hall? - The collection contains specimens of a Hyolithes from the shales of the Potsdam epoch at Pioche, Nev., that seem to differ too little from H. primordialis Hall, from the strata of the same epoch in Wisconsin, to warrant a full specific separation from it. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Maryland Geological Survey
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 736
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