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Point Loma Formation : ウィキペディア英語版 | Point Loma Formation
The Point Loma Formation is a sedimentary geological formation in Southern California. The strata date back to the Late Cretaceous. The formation is named after Point Loma, California. ==Description==
The Point Loma Formation was first described as the middle formation of the Rosario Group by Kennedy and Moore in 1971. Their description is that the lower half is composed of interbedded fine-grained, dusky yellow sandstone and olive-gray clay shale in ledgy graded beds about 20 cm thick, which grades into massive grayish-black siltstone in the top half of the formation.〔
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