The Condor-Like Vultures of Rancho La Brea Volume 6, No. 1 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ...only booid artiodactyls are antelopes with long-crowned molars. That the fauna of the region was not limited entirely to open and semi-arid plains is suggested by the presence of a goose (Branta), a mole (Scapanus), and a possible representative of Vrsus. Among the rodents the sewell (Aplodontia) was presumably a dweller in a moist region with abundant vegetation. Arctomys is not a characteristic plains form, but might have lived on the borders of open country. The mammalian fauna as a whole suggests plains with occasional lakes or meadows bordering rugged or elevated areas. The degree of humidity may have been somewhat greater, and vegetation more abundant than at the present time. The presence of Arctomys may suggest a slight cooling of the climate, either due to general climatic changes, or to elevation of this region. GENERAL CORRELATION OF VIRGIN VALLEY AND THOUSAND CREEK BEDS ON THE BASIS OF PHYSICAL AND FAUNAL RELATIONSHIPS TO OTHER FORMATIONS OF THE PACIFIC COAST REGION Such reference to correlation of the formations of northern Nevada as has appeared in this discussion up to the present time has been based upon either stratigraphic or faunal evidence considered alone. It seems important to consider the relation of these formations to each other, and to other members of the Tertiary system in the Pacific Coast region in the light of the combined evidence from these fields of investigation, in order to see the fragments of the palaeontologic record placed as nearly as possible in their true relative positions. In farther discussion it is desirable to use all of the available means of comparison checked against each other, in the hope that thus combined they may ultimately accomplish more than has been possible with any one group alone. Relation of Vi...