Geology . Fig. 393.—A concretion in the Dakota sandstone. Near Minneapolis, Kan. (Schaffner.). Fig. 394.—A group of concretions weathered out from the Dakota Minneapolis, Kan. (Schaffner.) 1 Is 01 OLOGY, The Colorado -The succeeding scries records an exten-sive invasion of the North American continent by the sea. The sub-mergence went so far as to establish a connection between the Gulfof Mexico on the south and the Arctic ocean on the north, over thesite of the Great plains, thus dividing North America, into two partsby a greal mediterranean sea. II was probably not be
Geology . Fig. 393.—A concretion in the Dakota sandstone. Near Minneapolis, Kan. (Schaffner.). Fig. 394.—A group of concretions weathered out from the Dakota Minneapolis, Kan. (Schaffner.) 1 Is 01 OLOGY, The Colorado -The succeeding scries records an exten-sive invasion of the North American continent by the sea. The sub-mergence went so far as to establish a connection between the Gulfof Mexico on the south and the Arctic ocean on the north, over thesite of the Great plains, thus dividing North America, into two partsby a greal mediterranean sea. II was probably not before this epoch,and perhaps not until the next, that the exposed Upper Cretaceousseries of the Coastal plain began to be deposited, though exact cor-relation of these widely separated series has not yet been made. The limits of the mediterranean sea of the Colorado epoch canonly be approximately located. The western limit appears to haveextended from northern Mexico, through Arizona, Utah, eastern Idaho,and western Montana into British Columbia, though at the west therewere probably many
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