Print ISSN: 0031-0247
Online ISSN: 2274-0333
A pangolin from the French Quercy phosphorites
The skull of Tetraceratops
Notidanodon tooth (Neoselachii: Hexanchiformes) in the Late Jurassic of New Zealand
Fossil vertebrate assemblage at Las Aguilas
A femur of the giant bird Gargantuavis
The stratigraphic sequence of North American rodent faunasNorth America; Rodents; Stratigraphic sequence
Cite this article: Wilson R. W., 1980. The stratigraphic sequence of North American rodent faunas. Palaeovertebrata 9 (ext): 273-283.
Rodents first appear in the latest Paleocene or earliest Eocene as very fragmentary specimens (Family Paramyidae) known largely from a single locality. After this sparse beginning, rodents are usually abundant in the North American record if proper recovery methods are used. Utilization of rodents for biostratigraphic purposes depends on 1/ extinction, and 2/ replacement by evolution of endemic groups and/or incursions of Old World rodents, and rarely and late by South American kinds. These incursions are separated by relatively long periods of isolation in the Paleogene, but more episodic in the Neogene. At least 10 rodent zones can be characterized by major distinctions, and these zones can be amplified into as many as 16 with little trouble. In general, rodent genera permit as refined a zonation as do genera of large mammals. Distinction at a specific level has not been attempted herein except in the Blancan and Post-Blancan.
Published in Vol. 9, Ext (1980)