Temblor Formation
Temblor Formation
Miocene to Oligocene
A thick sequence of marine shale and sandstone occurring in the San Emigdio Mountains in southwestern map area. Shale is typically micaceous and locally silty; interbedded sandstone is typically massive to thickly bedded, locally cross bedded, locally coarse and pebbly to conglomeratic, especially near base of unit (Nilsen and others, 1973; Kellogg and others, 2008; Chapman and Saleeby, 2012).
Generally conformably overlies Pleito Formation but locally exhibits unconformable contact with underlying Pleito, San Emigdio, and Tejon Formations or basement. Interfingers with, and overlies, Tecuya Formation. Locally includes porphyritic dacite clasts (Nilsen and others, 1973) probably sourced from adjacent Tunis volcanics member of Tecuya Formation (map unit tuv). Maximum thickness ~1,650 m near lower Santiago Creek, but thins laterally (e.g. Kellogg and others, 2008). Molluscan fauna, stratigraphic relations, and rare volcanic clasts indicate late Oligocene to Miocene age. Unconformably(?) overlain by Monterey Shale (map unit ms).