132 PROCEEDINGS OF THE PALEOXTOLOGICAL SOCIETY 



From the Columbia River to Cape Flattery is a series of northwestward- 

 pitching synclines, and 19,000 feet of beds are well exposed in continuous 

 section. In the Grays Harbor region there is complicated structure with 

 much folding. 



EVIDENCE INDICATING AX UNCONFORMITY AT THE BASE OF THE TAMIO- 

 SOMA ZOXE IX THE COALIXGA OIL FIELD, CALIFORXIA 



BY JOHN H. RUCKMAN 



{Abstract) 



That an unconformity exists at the base of the Tamiosoma zone seems es- 

 tablished by overlapping, irregular contacts, PhoTas borings, and underground 

 structure. The apparent gradation into the lower beds at the northern end 

 of the section is probably explained by the fact that the conglomerates of the 

 "Big Blue" were worked over and redeposited at the base of the Santa Mar- 

 garita with little change. The line of contact therefore probably runs some- 

 where through the conglomerate. 



The position of the unconformity, a short distance below the Astrodapsis 

 whitneyi beds, corresponds closely to the unconformity in the San Pablo of 

 Mount Diablo, but the unrecorded interval may also include the lower San 

 Pablo. 



Discussion 



Mr. Taff said that he had long suspected this unconformity from the field 

 relations. 



The following paper was read by title : 



COXTRIBUTIOXS TO AVIAN PALEOXTOLOGY FROM THE PACIFIC COAST OF 



XORTH AMERICA 



BY LOYE HOLMES MILLER 



(Abstract) 



The paper is an effort to assemble and to harmonize the results obtained in 

 study of fossil bird remains from the Pacific coast of North America. Brief 

 papers by Cope and by Lucas and a somewhat extended account by Shufeldt 

 are reviewed. The main body of the paper is based upon a personal study 

 of the collections at the University of California. Nine geologic horizons are 

 represented in the remains discussed. All but three species recorded are from 

 deposits of Pleistocene age. The great range of conditions under which 

 remains were entombed as well as the variety of topographic conditions rep- 

 resented make the concept of the Pleistocene avifauna unusually complete. 

 The families Cathartidae and Falconidse are especially rich in fossil species. 

 Problems of distribution constitute one of the prime interests. A total of 

 fifteen fossil species show their closest relationship to forms at present re- 

 stricted to more southern ranges. Various suggestions as to the causes of 

 extinction are discussed and a tabular view of the Pleistocene avifauna of 

 the Pacific coast is presented. The number of species recorded is 120. 



