. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. '*>' i*CW *?* PLATE 7. A tar seep or pool in the center of these bones which served as the drift center for lodging materials. conditions for the capture of anything that might float into them— such as sand, small animals, leaves, twigs, limbs and trunks (PI. 12) of trees and bones of animals scattered over the plain. Once lodged this mterial would gradually be covered with the dust of the dry season and sealed for all time by the rising tar. These pits or tar-springs occur in an irregular
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. '*>' i*CW *?* PLATE 7. A tar seep or pool in the center of these bones which served as the drift center for lodging materials. conditions for the capture of anything that might float into them— such as sand, small animals, leaves, twigs, limbs and trunks (PI. 12) of trees and bones of animals scattered over the plain. Once lodged this mterial would gradually be covered with the dust of the dry season and sealed for all time by the rising tar. These pits or tar-springs occur in an irregular line across the flood-plain almost at right angles to the general direction of the slope and flow and the debris was found chiefly on the side of the mounds or pools nearest the source of the flood. Yet another corroborating evidence is found in the fact that these beds are found nearer the middle of the plain which is also the. lowest portion now being cut thru by a shallow depression. It is also observed that at other tar- seeps in the vicinity, where drifting was not favorable, these animal remains are not found. Lastly it should likely be noted that the drift method better accounts for the conditions in which the fragmentary human remains were found. In some such fashion, therefore, the chimney-like, forms or columns of bones and debris were built up from season to season until the extinction of the race occurred. 61. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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