Rates of Late Cenozoic Uplift, Baldwin Hills, Los Angeles, California

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Science  17 Aug 1973:
Vol. 181, Issue 4100, pp. 653-655
DOI: 10.1126/science.181.4100.653


Radiocarbon ages for the marine late Pleistocene stratigraphic units of the Baldwin Hills are 36,200 ± 2,750 years and 28,450 ± 2,600 years, respectively, defining the termination of marine deposition in this area of the Los Angeles Basin at less than 28,000 years ago. Faunas of the older sample suggest that water depths were about 100 meters at the time of deposition. Shoaling of waters by deposition resulted in very shallow marine to nonmarine conditions about 28,000 years ago. The average rates of uplift for the past 36,000 years have been between 0.5 and 0.8 meter per 100 years.