32 



CALIFOKNIA ACADEMY OF SCIENCES. 



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

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

 fauna. The great preponderance of pelecypods over gastropods as regards the num- 

 ber of individuals is noteworthy in the Los Cerritos deiwsits. 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 bluff to the 

 south and southeast of Long Beach. A typical section of the bhiff 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 uustratified 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 bluff, 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 

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

 taining only Ostrea lurida. 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 Ostrea lurida, CryiAomya 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 

 Balanus concavus 

 Crepidula rugoaa 

 Columbella var. cariuala 

 C'ardium procerum 

 Cardium fjnadrigenarhim 

 Crucib II In m spinas u m 

 Chionc simillima 

 Chlorostoma funehrale 

 Cryptomya cali/ornica 

 Conus californicus 

 Donax IcevigcUa 

 Dentalium hexarjonum 

 Drillia var. peniciUala 

 Fissu ridca inierj ualis 

 Olyrymeris seplenlrionalis 

 Lucina ntittalli 



The deposits of 

 although no fossils have 

 deposits around the base 



Lucina cali/ornica 

 Liitorina scutulata 

 Lunatia lewisii 

 Leda taphria 

 Monoceros engonatum 

 Maconia sccta 

 Macoma nasula 

 Nevcrita reculziana 

 Nassa perpinguis 

 Nassa cerrilensis 

 Nassa tegula 

 Nassa me.ndica 

 Nassa var. coopcri 

 Nassa fossata 

 Nassa californiana 

 Ostrea lurida 

 Olivelta biplicala 



Dominguez Hill are probably of 

 been found in them. Lithologically 

 of Los Cerritos Hill. 



Olivella pcdroana 

 Olivella intorta 

 Pecten ventricosus 

 Pecten latiatiriltis 

 Pecten var. monotimeris 

 Pleurotoma carpentcriana 

 Pteronotus festivus 

 Serpulorbis squamigrrus 

 Scala tincta 

 Terebra simplex 

 Tagelus californianus 

 Turritella cooperi 

 Tellina bodeginsis 

 Tivela crnssatelloidcs 

 Tapes slaviinra 

 Vcnericardia barbarensis 

 Zirphaia gabbi 



upper San Pedro age, 

 they are similar to the 



