STRATIGRAPHIC SUMMARY. 66i 



In central Washington, the Ellensburg beds (1,000-1,500 ft.) 

 and the Yakima basalt represent Miocenic. The Columbia River 

 basalt of eastern Oregon and the Upper Astoria sandstone and the 

 Empire formation of western Oregon are of Miocenic age. 



Elsewhere in California the Santa Margarita beds are succeeded 

 by the Jacalitos formation and this after a disconformity (?) by the 

 Etchegoin formation. The lone formation of northern California, 

 the Esmeralda formation of Nevada and the Bozeman formation of 

 Montana are continental deposits of Miocenic age in the western 

 states. Other non-marine Miocenic beds are : 



III. Upper Miocenic (in part Pliocenic) : Loup Fork beds of 

 the Great Plains region; Lower Ogalalla beds of 

 Nebraska. 

 11. Middle Miocenic : Mascall beds of Oregon ; Deep River 

 beds of Montana ; and Pawnee Creek beds of Colorado. 

 I. Lower Miocenic : Upper John Day beds of Oregon ; Fort 

 Logan beds of Montana; and Arikaree group (Gering 

 and Rosebud formations) of Nebraska. 



XV. The Pliocenic System. 

 Marine Pliocenic strata are found in Florida and the Gulf region, 

 in some of the southern Atlantic states, and on the Pacific coast. 

 The Atlantic succession is : 



Upper Pliocenic or De Sotan (Reynosan). 

 Reynosa limestone of Texas. 

 De Sota beds of Florida. 



Upper Gayhead sands ( ?) of Martha's Vineyard, Mass. 

 Middle Pliocenic or Limonan. 

 Limon clays of Costa Rica. 

 Croatan beds of North Carolina. 

 Lower Pliocenic or Caloosahatchian. 

 Caloosahatchie marls of Florida. 

 Waccama beds of Carolinas. 

 On the Pacific coast the Merced (upper) and San Diego (lower) 

 series represent the Pliocenic. In the Mount Diablo region, the 

 Siestan and Orindan formations separated by a disconformity ( ?), 

 represent the Pliocenic. In southern California, the Fernando 



