Page:Popular Science Monthly Volume 86.djvu/258

This page has been proofread, but needs to be validated.
254
THE POPULAR SCIENCE MONTHLY
A Basin in the Ricardo Pliocene near Ricardo. (Photograph by C. L. Baker.)
Geological Periods Mammal Beds of the
Mohave Area 		Recognized Formations of other Western
Areas
Pleistocene Manix Beds Rancho La Brea, California
Pliocene Upper
Middle
Lower Ricardo Beds Thousand Creek, Nevada
Rattlesnake, Oregon
Miocene Upper Barstow Beds Cedar Mountain, Nevada
Middle Mascall, Ore. and Virginia Valley, Nev.
Lower Columbia Lava of Oregon

Ricardo Pliocene at Ricardo. This is one of the most important fossil localities in the Ricardo formation. (Photograph by C. L. Baker.)

This article is issued from Wikisource. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.