74 SOU! HERN CALIFORNIA ACADEMY OF SCIENCES 



PREHISTORIC FAUNA OF CALIFORNIA. 



PLATE 5. 



Pliocene and Cretaceous Fossils recently described by Dr. 

 J. G. Cooper. * 



57. Planorbis pabloanus, Cooper. 

 ':>^. Anodonta lignitica, Cooper. 



59. Limnaea contracosta, Cooper. 



The three above named species were found in a bed of 

 laminated lignite, discovered about 1868 by Dr. Cooper and the 

 writer, along the westerly branch of San Pablo Creek, Contra 

 Comity, California. 



The lignite is supposed to have been deposited in a Pliocene 

 lake. On the east are deposits of marine ^Miocene fossils, on 

 the west altered Cretaceous rocks with "Aucella Piochii." The 

 coal-strata have evidentlj^ been uplifted to an angle unusual in 

 Pliocene deposits, but there is nothing to fix the date of the 

 volcanic outburst Avhich is seen in Eocky Mound, three and a 

 half miles distant. 



60. Amnicola Yatesiana, Cooper. ^Magnified five diam- 

 eters. 



"This little shell is found in great numbers in Pliocene de- 

 posits on both sides of San Francisco bay, at ^fission San Jose, 

 on the east (the original locality), also near Stephen's Creek, 

 and near Los Gatos on the west. Carninifex Xewberryi and 

 other living species occur with it in localities, also some species 

 that may, like this be extinct. ^Ir. AYatts obtained specimens 

 taken from an artesian well at Lambertson's, Tulare County, 

 1. 058 feet deep.'" 



61-62. Cucullaea Bowersiana, Cooper. Cretaceous. Orange 

 County. Califoriiia. 



63. Agasoma kernianum, Cooper. Pliocene: Kern County, 

 California. 



64. Mytilus dichotomus, Cooper. Cretaceous "B." Coal 

 ]\Iines, San Diego County, California. 



* Bulletin Xo. 4. Cal. St. Mining Bureau, 1894. (loc. cit.) 

 59-60— Fresh water shells. Pliocene. 

 61-62 and 64.— Cretaceous. 63 Tertiary. 



