588 C. SCHUCHEET PALEOGEOGRAPHY OF NORTH AMERICA 



Table of Cretacic Formations 



Colorado, Wyoming, and 

 Montana 



Break 6 c J Denver 



Laramie ^_21 Arapahoe 



IAV 



f Montana 



Bearpa 



Judith River 



Claggett 



Eagle 



Niobrara ] 



^Colorado 

 Benton J 



(Bear River) 



Dakota 



Break 



Western interior 

 of Canada 



(?) Paskapoo 

 Edmonton 



Bearpaw (Odanah) 

 Belly River 



> Claggett 



Niobrara 

 Benton 



Dakota 

 Break 



(Melwood) 



Texas 



Gulf coast 



Break 



Navarro 



Taylor 

 Austin 

 Eagle Ford 



Woodbine 

 Break 



Break 

 Ripley 



Selma 

 Eutavv (Up- 

 per) 

 Break 



Atlantic 

 coast 



Break 



Jerseyian 



Rip'.eyian 



Raritan 



(Magothy) 



Break 



Mexico. — In Mexico the late Comanchic or Washita submergence con- 

 tinned unbroken into the Neocretaceous, according to the Mexican geolo- 

 gists. An extensive and well exposed section may be studied along the 

 line of railway between Cardenas and Las Canoas, going east from San 

 Luis Potosi to Tampico. Here, according to Bose, 249 the Cardenas lime- 

 stone has an approximate thickness of 1,800 feet. He correlates this 

 limestone with the Lower Senonian of Europe, and states that it rests on 

 the Turonian or their Mesocretaceous. The former fauna holds the hori- 

 zon of the American Lower Montana, or, better, the Eipleyan. In the 

 basal portion of the Cardenas formation are the GryphaBa beds, with 67. 

 vesicularis, Exogyra costata, and Ostrea aguilerce. Higher up occurs the 

 Orbitoides limestone, with Ostrea cf. goldfussi, Inoceramus cf. crispii, 

 and corals. The upper member is the Coralliochama limestone, with 0. 

 ioehmi, Radiolites austinensis, Biradiolites (3 species), Exogyra costata, 

 Ostrea glabra, Anomia argentaria, A. grypliorlvynclius, and abundance of 

 Actceonella, and corals. These faunas appear to be related to those of 

 the lower division of the Blue Mountain series of Jamaica. 



Bose states that the Cardenas faunas are 



"in intimate relation with those of Europe, and especially with those having the 

 mediterranean facies [as those of Gosau], but to it have been added some types 

 of the fauna of the North. As already stated, however, our faunas are not 

 always identical with those of Europe, but generally they are somewhat dis- 

 tinct in character; there must have been a relatively rapid migration from 



249 Bose : Bol. 24, Institute Geologico de Mexico, 1906. 



