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Media type:
E-Article
Title:
Lagomorpha from the Rosebud Formation, South Dakota
Contributor:
Green, Morton
Published:
Society of Economic Paleontologists and Mineralogists and the Paleontological Society, 1972
Published in:
Journal of Paleontology, 46 (1972) 3, Seite 377-385
Language:
English
ISSN:
0022-3360;
1937-2337
Origination:
Footnote:
Description:
Lagomorpha are described from a new local fauna, Black Bear Quarry II, of the Rosebud Formation (early Hemingfordian) in Bennett County, South Dakota. A new genus and species of ochotonid, Gripholagomys lavocati, with unilateral hysodonty, a primitive P3and a leporid-like P4has resemblances to Amphilagus. Upper teeth of Archaeolagus primigenius (Matthew) and A. macrocephalus (Matthew) are described. A relict palaeolagine is possibly present in the fauna. Either advanced Archaeolagus or primitive Hypolagus is present in three different localities: Martin Canyon Quarry A, Colorado; Black Bear Quarry II of nearly the same age; and Split Rock, Wyoming, which is younger. In each, different ochotonids are known. It is conjectured that environmental facies differences are the most likely reasons for this. Migration from Eurasia is considered the most likely origin of North American Miocene ochotonid genera.