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Santa Susana Formation
The Santa Susana Formation is a Paleogene period geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.〔(USGS.gov: Geolex - Santa Susana Formation ); accessed 8.15.2015〕〔("A summary of work in progress on the Tertiary and Quaternary of western North America" ); Clark, B.L.; Pan-Pacific () Science Congress Proceedings, Australia, v. 1, p. 874-879 (1924); accessed 8.15.2015.〕〔("A contribution to the paleontology of the Martinez Eocene of California" ); Nelson, R. N.; University of California Publications in Geological Sciences v. 15, no. 11 (1925); (397-466 ); accessed 8.15.2015.〕
The formation consists largely of light-gray shale and some fine-grained shaly sandstone, with a lense of heavy conglomerates in the lower part.〔〔( USGS.gov: "Preliminary geologic map of the Santa Susana quadrangle, Southern California" ); R. F. Yerkes1 and R. H. Campbell; accessed 8.15.2015.〕 It is from thick.〔〔
==Fossils==
The Santa Susana Formation preserves fossils from the Late Paleocene to Early Eocene epochs in the Paleogene period of the Cenozoic Era.〔〔(【引用サイトリンク】author= Various Contributors to the Paleobiology Database )〕 Fossilized fauna in the Santa Susana Formation is entirely different from that of underlying Martinez Formation, and has very little in common with that of the overlying Meganos Formation.〔〔〔("Checklist of California Tertiary marine Mollusca" ); Keen, A.M., and Bentson, Herdis; Geological Society of America Special Paper, 56, 280 p. (1944); ; accessed 8.15.2015.〕
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