32 



CALIFORNIA ACADEMY OF SCIENCES. 



oue is an echinoderm. It is similar to the upper San Pedro fauna of the beds at the 

 north end of the San Pedro blufl; and has even a more southern character than that 

 fauna. The great preponderance of pelecj^pods over gastropods as regards the num- 

 ber of individuals is noteworthy in the Los Cerritos dejiosits. It is such a fauna as 

 would be found on a low, sandy coast. 



There is an extensive exposure of upper San Pedro strata in the bkifT to the 

 south and southeast of Long Beach. A typical section of the bluff is represented by 

 the section exposed at B (diagram E, Plate XXIII), about one and one-half miles 

 east of the Long Beach wharf. The sequence of the beds is as follows : 



Soil, grading into nnstratified brown sand 12 feet 



Thin beds of light gray sand 8 feet 



White -wind-bedded sand 15 feet 



Brown sand, with horizontal bedding 6 feet 



Total thickness 41 feet 



All of the strata from this point west to A (diagram E, Plate XXIII), the end 

 of the blufT, dip gently westward, the lower strata disappearing successively under 

 the level of the beach. The fossils in this series occur only in local deposits, most of 

 them being found in lens-shaped pockets in the white sand layer. There is a very 

 fossiliferous deposit at E, which extends for three hundred feet along the base of the 

 clif!. At B (diagram E, Plate XXIII), also, there is a small deposit of sand con- 

 taining only Oslrea htrida. It is probable that for the most part these strata were 

 deposited during a period of sand-dune and estuarine conditions along this part of the 

 coast. The dominating shells in these deposits are Ontren lurida, Cryptomya califor- 

 nica, Tagelus californianus, and other forms which inhabit lagoons and shallow 

 waters. The following fossils were obtained from the fossiliferous bed at the base of 

 the bluff at E, southeast of Long Beach. 



List of Fossils from the Beds Southeast of Long Beach. 



Anomia lampe Lucina calij'ornica OUvclla pcdroann 



BalanuK concavua lAttorina scutulata OUvclla intorta 



Crepidula rugosa Lunatia lewisii Pecien ventricosus 



Columbelta var. car'mata Lcda taphria Pecten latiauritvs 



C'ardium procerum Monoceros engonatum Pecten var. monotimeris 



Cardium ijuadrigenarium Macoma sccta Pletirotoma carpentr.riana 



Crucibuliim spinoaum Macoma nasuta Pteronotun fcstivus 



Chione aimillima Neverlla recuhiana Serpulorhis squamigcrus 



Chlorostoma /unebrale Nassa perpimjah Scala tincta 



Cryptomya cali/ornica j\''assa cerritensin Terebra simplex 



Conus californicus Nassa tetjula Tagelus californianus 



Donax Icevigala N(msa mcndica Turritella cooperi 



Dentalium kexagonum Nassa var. cooperi TelUna bodcgensis 



Drillia var. penicillala Nassa fossata Tivela crassatelloidcs 



Fissuridea Imequalis Nassa californiana Tapes staminea 



Olycymeris septenlrionalis Ostrca lurida Venericardia barbarensis 



Lucina nuttalli Olivella biplicata Zirphcea gabbi 



The deposits of Dominguez Hill are probably of upper San Pedro age, 

 although no fossils have been found in thcin. IJthologically they are similar to the 

 deposits around the base of Los Cerritos Hill, 



