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Merychippus Isonesus (Cope) from the Later Tertiary of the Crooked River Basin, Oregon

Maxson, John H. (1928) Merychippus Isonesus (Cope) from the Later Tertiary of the Crooked River Basin, Oregon. In: Papers concerning the palaeontology of the Cretaceous and later Tertiary of Oregon, of the Pliocene of northwestern Nevada, and of the late Miocene and Pleistocene of California. Publications of the Carnegie Institution of Washington. No.393. Carnegie institution of Washington , Washington, DC, pp. 55-58.

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Although Tertiary deposits, presumed to be the correlative of the Mascall and Rattlesnake formations of the John Day basin, are known to occur in the Crooked River basin south of the Ochoco Mountains in central Oregon, no vertebrate fossils of diagnostic value have been obtained from these beds. Merriam and Sinclair record the finding of a caniniform premolar of a merycoidodont in Mascall beds exposed on the divide between Camp Creek and the Crooked River. Recently R. W. Chaney has reviewed the evidence on which is based the recognition of the Mascall horizon in the Crooked River region. In the course of palreontological investigations conducted in central Oregon under the leadership of Dr. Chester Stock, an upper tooth of Merychippus was collected in deposits, regarded as Mascall in age, along the Crooked River between Post and Paulina. In view of the opportunity to compare the stage of evolution of this specimen with that represented by the dentition of the merychippine forms from the type Mascall, a description seems desirable. The writer wishes to acknowledge the guidance of Dr. Stock during the progress of this study.

Item Type:Book Section
Additional Information:© 1928 Carnegie institution of Washington.
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Balch Graduate School of the Geological Sciences23
Series Name:Publications of the Carnegie Institution of Washington
Issue or Number:393
Record Number:CaltechAUTHORS:20191018-112352988
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99365
Deposited By: Tony Diaz
Deposited On:23 Oct 2019 17:02
Last Modified:23 Oct 2019 17:02

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