Merychippus Isonesus (Cope) from the Later Tertiary of the Crooked River Basin, Oregon
- Creators
- Maxson, John H.
Abstract
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.
Additional Information
© 1928 Carnegie institution of Washington.Attached Files
Published - Maxson_1928p55.pdf
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Additional details
- Eprint ID
- 99365
- Resolver ID
- CaltechAUTHORS:20191018-112352988
- Created
-
2019-10-23Created from EPrint's datestamp field
- Updated
-
2019-10-23Created from EPrint's last_modified field
- Series Name
- Publications of the Carnegie Institution of Washington
- Series Volume or Issue Number
- 393
- Other Numbering System Name
- Balch Graduate School of the Geological Sciences
- Other Numbering System Identifier
- 23