STRATIGRAPHY OF OHIO WAVERLY FORMATIONS 763 



the Buena Vista. This is the nearest approach to this condition 

 observed. 



The Vanceburg member consists of typical sandstones of the 

 facies. It is best developed in the vicinity of Vanceburg, Kentucky 

 (from where the name is derived), and Buena Vista. Here the 

 member is about 150 feet thick and on the whole the sandstones 

 are thicker than the intervening shales. Both northward and east- 

 ward the shales become relatively more important, and at Bain- 

 bridge they form much the larger part of the member. These 

 sandstones give place by transition to the shales of the Scioto 

 Valley facies, but rather abruptly, along the line indicated on the 

 map. 



The Churn Creek member is seldom seen and then not well. 

 It consists of argillaceous shale with an occasional thin sandstone 

 and the deposits of the Vanceburg member pass into it gradually. 

 Except for the difference in relative amounts of sandstone and shale 

 it is of the same t3^e. It appears to be between 50 and 100 feet 

 thick, but no section has been seen which admits of determination 

 of this point. It is present in Ohio only in western Scioto and 

 eastern Adams counties, being removed farther north, and only 

 in the vicinity of Buena Vista is the Logan formation found over- 

 lying it. It is named from Churn Creek in the southeastern part 

 of Adams County, on the divide between which and the head of 

 Lower Twin Creek good outcrops are seen in roadside ditches. 



THE CUYAHOGA FORMATION IN KENTUCKY 



It has been shown how the outcrop belt of the Cuyahoga passes 

 southwestward diagonally across the five successive facies from the 

 Toboso facies in central Ohio to the Vanceburg facies at the Ohio 

 River. From the Ohio River the outcrop belt of this formation 

 continues southwestward into Kentucky. The writer has seen it 

 at various points as far as the center of the state^ but is not prepared 

 to discuss it from such observation. Morse and Foerste have 

 published sections from this region that indicate something of the 



' Under grant from the Esther Herrman Research Fund of the New York Academy 

 of Sciences. 



