Term Budden Canyon Formation proposed to include those rocks of Ono and Chanchelulla Peak 15' quads that lie above igneous and metamorphic rocks of Klamath Mountains complex and are unconformably overlain by Tehama (Pliocene) and Red Bluff (Pleistocene) Formations. Type section designated as exposures along State Route 36 (Dry Creek-Budden Canyon) from secs.35-36 T29N R8W to sec.18 T28N R6W, Ono 15' quad Tehama Co, CA. Consists of thick succession of medium to dark-gray sandstones, siltstones and mudstones, and minor amounts of conglomerate. Total thickness estimated at 22,000 ft. Divided into seven members: Rector Conglomerate, Ogo (new), Roaring River, Chickabally Mudstone (new), Huling Sandstone, Bald Hills and Gas Point (new) Members. Thickness ranges from 7,400 to 22,000 ft. Ranges in age from Hauterivian to Turonian [Early to Late Cretaceous] based on fossils. Ono Formation (Murphy, 1956) is abandoned in this report.

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

Upper part of Chickabally Mudstone Member of Murphy and others (1960) here renamed Aiken Member (new) of Budden Canyon Formation. Lower part is now Chickabally Member, its type section likewise restricted to 900 ft along Roaring River in secs.32-33 T30N R7W. Biostratigraphic study of foraminifers especially in Chickabally and Aiken Members. Geologic maps of portion of Ono quad show distribution of members.

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