:i'2 



CAMl'OHNIA ACADKMV (tK SCIKNfKS. 



one is an ffliiinxli'iiu. It is siiniliir to the up|)<'r San I'cdro fauna of the hods at tho 

 north end of thi' San I'l-dro l)hiiT; and lias even a more southern character than that 

 fauna. Tho ureat preponderance of pelecypods over <jastropods as rejiards the niini- 

 iier of indiviihials is noteworliiy in the Los Cerritos deposits. It is sucli a fauna as 

 wiadd lie found on a h)\v, sandy coast. 



'Piiere is an extensive exposure of upper San I'echo strata in tlie i)hilT to tlie 

 south and southeast of Loiiu; 15eaeh. A typical section of the hind is represented hy 

 the section exposed at />' (diaj^rani h\ Plate X X 1 1 1), about one and one-half miles 

 cast of the Long Headi wharf. The sequence of the beds is as follows : 



Soil, grading iuto iiiistratilied brown s»u>l 12 feet 



Thin bods of light gray nand 8 feet 



White wind-beililoil siind 15 feet 



ISruwn «nnd, with horizontnl bedding 6 feet 



Total thickness 41 feet 



•Ml of the strata from this point west to A (diaiiram /?, Plate XXIII), the end 

 of the hluiT, dip i^ently westward, the lower strata disappearing successively under 

 tlie 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 K, which extends for three hundred feet along the base of the 

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

 taining only Ostiea luridn. 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 

 coa.st. The dominating shells in these deposits are Ostrea lurida, Cryptomya califor- 

 tiica, Tngelns cnlifnrniaiHiA, and other forms which inhabit lagoons and shallow 

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

 the bluff at E, southeast of Long Beach. 



List ok Fossils kkom the Beds South ea.st ok Long Beach. 



Anomia lampt Liicina cali/ortiica Olivella pedroana 



Balanun eoneavun Littorina scntukita Olivella intorta 



Crepidula rugona Luiialia Irwisii Pectcn venlrieosus 



Columbella var. rnrhinla Lcda taphria Pecten latiaurilus 



Cardlum procenim Afonoceros cngonalum Pecten var. monolimeris 



Cardium quadrigrnariiim Mnroma secta Plcurotoma carpenlcriana 



Crucihaliim npinnKum Macoma nn»uta Pteronotu/s festivus 



Chionr. simillima Sevcrila rrmlzinnn Serpulorbis squumiijcrus 



Ckloroftomn J'un^bral- XdKua per/iinguis Scala tincta 



Cry/ilomija aili/ornica yansa rerrilensit Terebra simplex 



Conw calil'ornicus Xansa trgula Tagelux californianua 



Donnx litvignia ymuKt mendica Turrilella cooperi 



DentaUnm hfxagonum Xafun var. roopcri Tetlina bodegcnms 



Driltia var. prnieillala Sn.va J'oMnla Tivela crasnatelloides 



FiMuridea inftqiialis Jfasna cali/orniana Tapes staminea 



Olt/njmerin »e ptcntrionnlii OsCrca lurida Venericardia barbarcnais 



Lurina ntittalli Olivella biplicata Zirphcea gabbi 



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

 although no fossils have been found in them. Lithologically they are similar to the 

 deposits around the base of Los Cerritos Hill. 



