. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. ?lb. iV <? iff * 1 ;#, r PLIOCENE PECTENS. PLATE Pectens. (Unless otherwise stated all figures are about two-thirds natural size.) Fig. 1. Pecten (Chlamys) units! Arnold. California Acad. Sci. Type. Exterior ofslightly imperfecl left valve; altitude 66 mm. Lower Pliocene, Krey-enhagens ranch, Fresno County. Also found in the lower Pliocene ofsouthern California. Eight valve with broader, flatter ribs. Fig. 2. Pecten {Pecten) stearnsii Dall. 148008. Ex
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. ?lb. iV <? iff * 1 ;#, r PLIOCENE PECTENS. PLATE Pectens. (Unless otherwise stated all figures are about two-thirds natural size.) Fig. 1. Pecten (Chlamys) units! Arnold. California Acad. Sci. Type. Exterior ofslightly imperfecl left valve; altitude 66 mm. Lower Pliocene, Krey-enhagens ranch, Fresno County. Also found in the lower Pliocene ofsouthern California. Eight valve with broader, flatter ribs. Fig. 2. Pecten {Pecten) stearnsii Dall. 148008. Exterior of left valve;altitude 87 mm. San Diego formation (Pliocene), Pacific Beach, SanDiego County. Not rare in the Pliocene. (See PI. XXXVI, fig. 4, forright valve. Fig. 3. Pecten (Pecten) bellus Conrad. Acad. Nat. Sci. Phila. 960. Exterior of rightvalve; altitude SO nun.; about iive-sixths natural size. Pliocene, SantaBarbara. Also found in Pliocene of Ventura, Santa Barbara, and adja-cent count ies. Left valve slightly concave, with narrower ribs than right;otherwise similar. Fig. 4. Pecten (Plagioctenium) circu
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