656 NORTH AMERICAN INDEX FOSSILS. 



Rancocas (divided into Vincent own sand, and the 

 Horner stown or Sezvell marls). 



Middle Cretacic or Rtpleyan. 



Monmouth (including in descending order: Tinton beds, 

 Red Bank sands, Navesink marls, Mt. Laurel sands). 



Matawan (including Wenonah sands, Marshalltown 

 marls, Englishtown or Columbus sands, Woodbury clay, 

 Merchantville beds, Magothy and Cliffwood clays). 



Lower Cretacic (wanting). 

 (Disconformity. ) 



SuBFORMATiON — Raritan clays and sands (Upper Comanchic). 



On the gulf coast, the Lower Cretacic (Coloradoan) appears to 

 be represented by the Rotten limestone group of Alabama and 

 Mississippi, and perhaps the Tombigbee sands. 



On the Pacific coast, Cretacic beds are represented by the Chico 

 series of California, the Phoenix and Henley formations of Oregon, 

 and the Nanaimo group of Vancouver Islands. All of these corre- 

 spond approximately to the Lower Cretacic or Coloradoan. In 

 northern Alaska, the Bergman series and the Nonushuk series of 

 sandstones, shales and conglomerates, with seams of lignite (2,000 

 ft.) represent the Cretacic. 



C. THE CENOZOIC OR TERTIARY SYSTEMS.*^ 



XII. The Eocenic System. 



The most typical development of Marine Eocenic, is on the Gulf 

 Coast of North America, where the section comprises : 



Upper Eocenic or Jacksonian formation, including: the 

 Jackson beds oi Mississ'ippi,ihtZeuglodon &^(i^ of Alabama, 

 the Moody's branch beds of Mississippi and the Mark's Mill 

 beds of Arkansas. 



Middle Eocenic or Claibornian formation, including the 

 Whitebluff marls of Arkansas, and the Claiborne sands, 

 Ostrcea sellceformis beds, Lisbon beds and Tallahatta beds 

 of Alabama. 



*«Dall, W. H., 1 8th Annual Report U. S. Geol. Survey, Part II., p. 323. 



