Inhaltsangabe
This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1893. Not illustrated. Excerpt: ... THE RELATIONS OF THE COLORADO FAUNA TO OTHER CRETA- CEOUS FAUNAS. Within the geographic limits arbitrarily assigned to the Colorado formation in the early part of this paper there is only one other marine •*"" Upper Cretaceous fauna--that of the Montana formation, which imme diately overlies it. The larger part of it was described and illustrated by Prof. Meek in his volume on Invertebrate Paleontology,1 and many additional species have been described by Dr. White, Prof. Whitfield, and others. A comparison of these two successive faunas shows that they are remarkably distinct although, as should be expected, they have some species in common and others that are very closely related. The species that are considered identical nearly all belong to genera whose species are seldom sufficiently differentiated to be depended upon in close geologic correlation. Those that seem to have passed up from the Colorado to the Montana formation are not usually found associated with the typical Montana fauna, but the most of them occur in that peeidiar phase of it that was developed along the western shore line. In the following list of common and closely related species in the two formations the interrogation after a name indicates a doubt as to the identity of closely related forms: ^ Colorado formation. Montana formation' Ostrea soleniscus. O. solenisena. Ostrea prudentia. O. patina. Anomia propatoris? A. propatoiis. Modiola multilinifier.i. M. mnltilinigeraf Inoceramns Simpson i. / I. simpsoni. Barbatia micronema. B. microncmu? Nemodon suloatinus.? N. sulcatinus. Lucina sutrandata. L. subundata. Veniella mortoni. V. hnmilis. Anatina lineata. A. lineata? Corbula subtrigonali3. C. subtrigonalis. Lunatia concinna? L. ooncinna. Baculites asper. B. asper? Placenticeras place...
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