no. 1617. NEW CRETACEOUS AND TERTIARY FOSSILS—ARNOLD. 34% 
folded and faulted in places, thereby making the thickness appear 
greater than it is. Areas of supposed Chico are found in the low 
hills west of Redwood and west of Stanford University, but no im- 
portant faunas have been obtained from these exposures. The Chico 
beds in the vicinity of Pigeon Point have yielded the following 
species : 
List of Chico, upper Cretaceous, fossils from the Santa Cruz quadrangle. 
PELECYPODA, 
Anatina tryoniana Gabb. Ostrea brewerti (7?) Gabb. 
Arca vancouverensis Meek. Panopea concentrica Gabb. 
Cucullwa bowersiana Cooper. Pholadomya subelongata Meek. 
Glycymeris veatchii (Gabb). Pinna calamitoides Shumard. 
Inoceramus subundatus Meek. Trigonia evansiana Meek. 
Mactra stantoni, new species. - Trigonia leana Gabb. 
Nucula truncata Gabb. 
GASTROPODA. 
OCinulia obliqua Gabb. Perissolax brevirostris Gabb. 
Lunatia, new species, p. Turritella pescaderoensis, new species. 
Margaritella, new species, a. 
CRUSTACEA. 
Archwopus antennatus Rathbun. 
TERTIARY. 
Undifferentiated Hocene-——The diabase dike exposed north of the 
headwaters of Pescadero Creek has brought up some considerable 
inclusions of impure limestone which, from the fossils found in them, 
appear to be of Kocene age. Obviously the stratigraphic relations of 
this great limestone inclusion are unknown, but the fossils indicate 
its Eocene age and that it probably belongs in the lower part of the 
formation. The following fauna occurs in this limestone: 
List of lower Eocene fossils from the Santa Cruze quadrangle. 
ECHINOIDEA. 
Cidaris merriami, new species. 
BRACHIOPODA., 
Terebratalia, new species, m. Terebratulina tejonensis Stanton. 
Terebratalia, new species, p.— 
PELECYPODA. 
Pecten proavus Arnold. Semele gayi, new species. 
GASTEROPODA. 
Chlorostoma, new species, c. Patella, new species, Db. 
Cylindrites brevis (7) Gabb. Patella mateoensis, new species. 
Fissurella perrini, new species. Thylacodes, new species, iw. 
Hipponyx carpenteri, new species. Tritonium newsomi, new species. 
Odostomia, new species, 0. 
