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- W2169748180 abstract "The structurally complex, prebatholithic strata in western San Diego County consist primarily of metamorphosed volcanic and volcanically derived sedimentary rocks. M. A. Hanna (1926) designated this unit “Black Mountain Volcanics” and proposed a late Triassic to Jurassic age. Because prior usage invalidated the name “Black Mountain Volcanics,” E. S. Larsen, Jr. (1948) substituted “Santiago Peak Volcanics” and attributed the unit to the Jurassic Period. Neither Hanna nor Larsen reported any fossils. The metavolcanic rocks are interbedded with argillite, graywacke, and slate, which were found to contain marine fossils at three localities. The fossils include Buchia piochii, belemnoids, and a few unidentifiable forms. The presence of Buchia piochii is indicative of a late Jurassic (Portlandian) age. Therefore, the interbedded sedimentary rocks indicate a Portlandian age for the more characteristic volcanic rocks of the Santiago Peak Volcanics." @default.
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- W2169748180 date "1967-01-01" @default.
- W2169748180 modified "2023-09-26" @default.
- W2169748180 title "LATE JURASSIC AGE OF THE SANTIAGO PEAK VOLCANICS, CALIFORNIA" @default.
- W2169748180 doi "https://doi.org/10.1130/0016-7606(1967)78[299:ljaots]2.0.co;2" @default.
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