1916] Martin: Pliocene of Middle and Northern California 245 



acteristic of the Etcliegoin, such as Echinarachnius gibbsii Remond, 

 Pecten watt sit Arnold, and Pecten nutteri Arnold, occur in the 

 Sargent section and do not occur in the region of Mount Diablo. It 

 seems, therefore, that Ave are justified in assigning the beds pre- 

 viously known as San Pablo, in the Sargent Oil Field, to the Etche- 

 goin Formation. 



The following species were collected by the writer from the 

 Etcliegoin of the Sargent Oil Field : 



Echinodermata 



Echinarachnius gibbsii Remond 

 Pelecypoda 



Area trilineata Conrad 



Cardium meekianum Gabb 



Chione securis Shumard 



Cryptomya quadrata Arnold 



Glycimeris coalingensis Arnold 



Macoma indentata Carpenter 



Macoma inquinata Deshayes 



Macoma nasuta Conrad 



Macoma secta Conrad 



Mya japonica Jay 



Mytilus coalingensis Arnold 



Ostrea atwoodi Gabb 



Panomya ampla Dall 



Panope generosa Gould 



Paphia staleyi Gabb 



Paphia staminea Conrad 



Paphia staminea, var. orbella Car- 

 penter 



Pecten nutteri Arnold 



Pecten oweni Arnold 



Pecten wattsi Arnold 



Pecten watts', var. etchegoini An- 

 derson. 



Phacoides annulatus Reeve 



Saxidomus nuttalli Conrad 



Schizothaerus nuttalli Conrad 



Schizothaerus pajaroanus Conrad 



Siliqua nuttalli Conrad 



Solen sicarius Gould 



Spisula albaria Conrad 



Thracia, sp. 



Yoldia cooperi Gabb 



Zirphaea gabbi Tryon 

 Gasteropoda 



Calyptraea filosa Gabb 



Chrysodomus portolaensis Arnold 



Crepidula princeps Conrad 



Nassa fossata Gould 



Natica, n. sp. 



Natica recluziana Petit 



Thais kettlemanensis Arnold 

 Cirripedia 



Balanus, sp. 



Later Neocene and Quarternary Deposits of Cape Blanco, Oregon 



At Cape Blanco, Oregon, about fifty miles north of the California 

 boundary, there are marine sediments which are closely related to 

 the later Pliocene formations of the California coast. In order to 

 point out these relations the geology and palaeontology of this 

 region will be briefly outlined. 



The formations concerned in the geology of this locality include 

 the Myrtle Formation, the Empire Formation, the Elk River Beds, 

 and a terrace formation which may be later than the Elk River Beds. 

 The oldest rocks are those of the Myrtle Formation, considered by 

 Diller, who described the formation, to be of Cretaceous age. Strata 

 of this formation outcrop along the cliffs from Cape Blanco north- 

 ward to Blacklock Point. They also occupy a very small area imme- 

 diately south of the Cape. Farther inland the Myrtle Formation is 



