Pastoria terrane – western Tehachapi Mountains
Pastoria terrane – western Tehachapi Mountains
early(?) Paleozoic(?)
Chiefly marble, quartzite, quartz-feldspar gneiss, mica schist, Escapula Peak migmatite, and hornfels. Unit includes Metasedimentary Rocks of Salt Creek of Ross (1989). U-Pb detrital zircon data suggests early Paleozoic to Neoproterozoic age (Chapman and others, 2012). Metamorphosed to upper amphibolite and granulite facies. Contact-metamorphosed by Late Cretaceous Lebec granodiorite and other units in Unit Gps. Terrane structurally overlies the Pelona-Rand Schist and the Tehachapi-San Emigdio terrane (units PS and TSS) along the Pastoria normal (detachment) fault. Terrane elevated to near-surface, along with enclosing middle to Late Cretaceous granitic rocks, during early Tertiary extension along the Pastoria normal (detachment) fault.