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• W2335249911 abstract "The sediments underlying Rancho La Brea reveal a well defined stratigraphy. The upper 45 meters (150 feet) of marine and terrestrial Pleistocene strata are referred to the Palos Verdes Sand, following the usage of Crowder and Johnson (1963), and are divided into three members. The asphaltic fossil deposits, famous for their rich representa- tion of late Pleistocene vertebrate life, are confined almost entirely to the uppermost mem- ber. It, in turn, consists of three submembers: a basal greyish-green, arenaceous and pebbly claystone; a middle, highly bituminous coarse-grained pebbly quartz arenite, and an upper unit of intertonguing and irregularly lensing grey clay, quartz arenite, asphaltum, and gravel deposits. Disconformable contacts between these submembers occur at depths aver- aging 6.3, 3.6, and 2.4 meters below the present land surface. A study of the Los Angeles County Museum catalogue entries, and of the field notes made at the times of excavation of the separate pits shows that the bones were concentrated into pockets of various sizes within each of these submembers. There were notable decreases in the numbers of speci- mens collected near levels corresponding to the disconformable contacts. Previous interpretations regarding the origins of the fossil deposits (Merriam, 1911; et al), have stressed the continuous activity of liquid asphalt pools as the primary mecha- nism for entrapment and preservation of the vertebrate fauna. Convective overturn of asphalt within the pools has been proposed to account for disarticulation of the skeletons, mixing and abrasion of the bones, and for the consequent loss of stratigraphy within the deposits. It is now apparent that many of the Museum pits show an essentially identical stratigraphy to that of the surrounding sediments. Carbon-14 dating of bone collagen residues has suggested the probability of stratification in at least one of the major pits (T. Y. Ho, et al., 1969). Reinterpretation of the fossil deposits indicates them to have formed at the sites of discontinuously active asphaltic seeps during the long interval of alluviation accompanying the late Pleistocene development of the Santa Monica Plain. Geological evidence also substantiates the view that fluviatile agencies have been an im- portant factor contributing to the concentration and preservation of the fossil bones." @default.
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• W2335249911 date "1973-01-01" @default.
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• W2335249911 title "Rancho La Brea fossil deposits; a re-evaluation from stratigraphic and geological evidence" @default.
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