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STUART WELLER 



position, and in central Arkansas, in the region of the Ouchita 

 uplift, the whole Mississippian series is absent, strata of Lower 

 Coal Measure age resting upon the Ordovician beds. 



The Kinderhook epoch of generally disturbed conditions, the 

 epoch of readjustment, was followed by the Osage which was a 



Fig. B. 



long period of tranquillity. No longer were there sediments of 

 various sorts being deposited in the interior sea. The surround- 

 ing land had sunk so low that practically no sediments were 

 transported by the streams, and the only rock-making material 

 furnished was the calcareous secretions of organisms. Crinoidal 

 fragments constitute the major portion of this limestone, though 

 the remains of corals and brachiopods are also abundant. 



The probable distribution of land and water during Osage 

 time is indicated in Fig. B. A great, quiet, interior sea extended 

 from the Cincinnati island on the east to the Rocky Mountain 

 land on the west, and from the southern Appalachian land to 

 the Wisconsin land at the north. The northwest passage still 

 furnished a means of communication with European waters. 



