Pg. 375 and map. Berkeleyan series. The entire series of rocks, volcanic and sedimentary, from base of Orindan formation to crest of Frowning Ridge, is here named Berkeleyen series, and the interval is regarded as having a break in its accumulation dividing it into Upper and Lower Berkeleyan. The Upper Berkeleyan includes Bald Peak basalt, Siestan formation, Grizzly Peak andesite, and several other unnamed formations. The Lower Berkeleyan includes Trampan and Orindan formations a a great thickness of unnamed igneous and sedimentary formations. The Berkeleyan series is unconformably overlain by Campan series and unconformably underlain by Monterey series. [Age is Pliocene.]
[Named from occurrence east of Berkeley, Contra Costa Co., San Francisco region, western CA.]

Source: US geologic names lexicon (USGS Bull. 896, p. 166).

Berkeley group. Includes rocks between top of Orinda formation and base of Campus formation. Divided into (descending) Bald Peak basalt, Siesta formation, and Moraga formation. Rests, with probable unconformity, on Orinda formation, and is unconformably overlain by Campus formation. [Age is Pliocene.]
[†Berkeleyan series of Lawson and Palache (1902) discontinued.]

Source: US geologic names lexicon (USGS Bull. 896, p. 166).

†Berkeley Group is abandoned. Rocks are reassigned to the Contra Costa Group.

Source: GNU records (USGS DDS-6; Menlo GNULEX).