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Science 17 March 1972:
Vol. 175. no. 4027, pp. 1250 - 1251
DOI: 10.1126/science.175.4027.1250
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Articles

An Eocene Hystricognathous Rodent from Texas: Its Significance in Interpretations of Continental Drift

Albert E. Wood 1

1 Department of Biology, Amherst College, Amherst, Massachusetts 01002

The earliest known representative of the fundamentally South American and African hystricognathous rodents has recently been found in the middle or late Eocene of southwestern Texas; this discovery supports the postulate of a northern and independent origin for the two southern groups and increases the evidence against mid-Tertiary trans-Atlantic migration of these rodents at a time when the South Atlantic was narrower than it is at present. The fossil seems to be related to the North American Eocene family Sciuravidae.

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