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The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Journal of the Alberta Society of Petroleum Geologists
Vol. 5 (1957), No. 7. (July), Pages 140-144

Cambrian Biostratigraphy of California Standard Parkland No. 4-12

G. O. Raasch1 and D. E. Campau2

ABSTRACT

Palaeontologic and stratigraphic study of the Cambrian section in Cal. Standard Parkland No. 4-12 shows Cambrian resting directly on Precambrian basement complex of crystalline schists. Basal clastics pass upwards into shales carrying the Middle Cambrian Albertella fauna. These are overlain by 320 feet of carbonate correlated with the Cathedral formation, 93 feet of shale carrying the Stephen Bathyriscus-Elrathina fauna, and 270 feet of carbonate correlated with the Eldon formation. Above the Eldon, a 187-foot shale is correlated with the Arctomys formation. The Cambrian section terminates with a thin-bedded limestone, 120 feet thick, carrying late Middle Cambrian trilobite genera presumably belonging to the Palella-Thompsonaspis faunizone. A similar fauna has been reported from the Pika formation of the Central Rockies.

The 1230 feet of Cambrian strata in the Parkland well are therefore entirely of Middle Cambrian age, the Lower Cambrian being missing as a result of eastward onlap, the Upper Cambrian as a result of erosion sometime before the Middle Devonian.


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