Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 16 September 1966:
Vol. 153. no. 3742, pp. 1376 - 1378
DOI: 10.1126/science.153.3742.1376
Prev | Table of Contents | Next

Articles

Fossil Mammals from Baja California: New Evidence on Early Tertiary Migrations

William J. Morris 1

1 Department of Geology, Occidental College, Los Angeles, California

Ungulates belonging to the family Barylambdidae were found in the same geologic unit with, but stratigraphically above, a specimen assigned to the Tillodontia and above several molars of the perissodactyl cf. Hyracotherium sp. This arrangement is unusual, as in the well-documented faunas from the Rocky Mountain Region Barylambdidae are known only from the Paleocene, Tillodontia from the Paleocene and Eocene, while Hyracotherium is known only from the Eocene. The expected stratigraphic order would be, from lowest to highest, Barylambdidae, Tillodontia, and Hyracotherium. It is suggested that the Baja California assemblage is late Paleocene on the basis of the generalized molars of cf. Hyracotherium sp. and the characters of cf. Esthonyx sp.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Early Eocene Vertebrates from Baja California: Evidence for Intracontinental Age Correlations.
J. J. Flynn, J. J. FLYNN, and M. J. NOVACEK (1984)
Science 224, 151-153
   Abstract »    PDF »
Arctic Terrestrial Biota: Paleomagnetic Evidence of Age Disparity with Mid-Northern Latitudes During the Late Cretaceous and Early Tertiary.
L. J. Hickey, L. J. Hickey, R. M. West, M. R. Dawson, and D. K. Choi (1983)
Science 221, 1153-1156
   Abstract »    PDF »
Paleocene Hyracothere from Polecat Bench Formation, Wyoming.
G. L. Jepsen, G. L. Jepsen, and M. O. Woodburne (1969)
Science 164, 543-547
   Abstract »    PDF »
Baja California: Late Cretaceous Dinosaurs.
W. J. Morris and W. J. Morris (1967)
Science 155, 1539-1541
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)