Monographs of the United States Geological Survey, volume 8
Monographs of the United States Geological Survey, volume 8
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subequivalvis Hall & Whitfield, 1872. Twenty-fourth Ann.
Bep. N. Y. State Mnseum Nat Hist., p. 189. /dem, Twenty-seventh Ann. Sep., 1875, pi. xi, figs. 2-4.
indenta Hall, 1883. Pal. N. Y., vol. v, pt. 1; Plates and ExplanationSi p. 19, pK Ixxix, figs. 6-23.
The Nevada specimens agree closely with those from New York and the Falls of the Ohio, no apparent variations occurring in a number of sped- mens except, it may be, in some young shells, a figure of one of which is given on plate v, fig. 14....
Formation and hcality. — Lower Devonian of Atrypa Peak. Eureka Di9- triety Nevada.
GASTEROPODA.
Oenns PLATYCEBAS Oonrad.
Of the eight species of Platyceras from the Lower Devonian horizoni five are identical with species of the Upper Helderberg Group of New York, viz: Platyceras carinatum Hall, P. conicum Hall, P. dentalium Hall, P. nodo- sum Conrad, and P. Thetis Hall (for descriptions and synonyms, see Pro- fessor Hall's beautiful monograph of the Devonian Gasteropoda of the State of New York, Pal.
What to read after Monographs of the United States Geological Survey, volume 8?
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To quickly assess the difficulty of the text, read a short excerpt:
subequivalvis Hall & Whitfield, 1872. Twenty-fourth Ann.
Bep. N. Y. State Mnseum Nat Hist., p. 189. /dem, Twenty-seventh Ann. Sep., 1875, pi. xi, figs. 2-4.
indenta Hall, 1883. Pal. N. Y., vol. v, pt. 1; Plates and ExplanationSi p. 19, pK Ixxix, figs. 6-23.
The Nevada specimens agree closely with those from New York and the Falls of the Ohio, no apparent variations occurring in a number of sped- mens except, it may be, in some young shells, a figure of one of which is given on plate v, fig. 14....
Formation and hcality. — Lower Devonian of Atrypa Peak. Eureka Di9- triety Nevada.
GASTEROPODA.
Oenns PLATYCEBAS Oonrad.
Of the eight species of Platyceras from the Lower Devonian horizoni five are identical with species of the Upper Helderberg Group of New York, viz: Platyceras carinatum Hall, P. conicum Hall, P. dentalium Hall, P. nodo- sum Conrad, and P. Thetis Hall (for descriptions and synonyms, see Pro- fessor Hall's beautiful monograph of the Devonian Gasteropoda of the State of New York, Pal.
What to read after Monographs of the United States Geological Survey, volume 8?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey Us to read onlineMoreLess
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