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

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Science  17 Mar 1972:
Vol. 175, Issue 4027, pp. 1250-1251
DOI: 10.1126/science.175.4027.1250


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.