762 JESSE E. HYDE 



it increases in thickness to about 25 or 30 feet along the west side 

 of the Scioto River well within the Scioto shale facies. Simul- 

 taneously the number of component beds increases. Farther east 

 than this on the east side of the Scioto River, and northward over 

 western Pike and southwestern Ross counties, its beds become more 

 shaly and worthless. It remains, however, so far as traced, much 

 the same type of deposit as characterizes the Vanceburg facies, 

 even where, on the eastern margin of the Scioto shale facies, it 

 becomes intertongued between those sandstones of a wholly 

 different tj^De that are clearly the western fringe bordering the 

 Hocking Valley conglomerate facies. At the most easterly point 

 where it was observed, however, several miles east of Piketon, the 

 component beds are much thicker than a mile or two to the west- 

 ward, and there is evidence that, as the Hocking Valley area is 

 approached, the member increases in importance. 



Westward from the western margin of Scioto County the Buena 

 Vista member continues to thin, and within two or three miles of 

 the zone where it is from 3 to 6 feet thick and economically im- 

 portant, it is less than a foot in thickness. It has not been traced 

 westward beyond this but it probably thins out entirely. This is 

 near the western limit of its outcrop belt. 



The Rarden shale member is named from Rarden, Scioto County. 

 It is not recognized outside the Vanceburg facies, since opportunity 

 to identify its upper limit is lost with the disappearance of the over- 

 lying sandstones. Like the Henley mem.ber, it consists of alter- 

 nating red and gray clay shales. At Vanceburg, Kentucky, it is 

 8^- feet thick; from here northward and eastward it increases in 

 thickness to 28 feet at Buena Vista, 27 feet at Rarden, 50 feet at 

 Bainbridge, and about 58 feet at Elm Grove in Pike County on the 

 extreme eastern margin of the facies. 



Along the western margin of the outrcop belt, in Adams County, 

 where the Buena Vista member becomes insignificant, this member 

 probably rests on, and is indistinguishable from, the Henley mem- 

 ber, although no section of precisely this type has been seen. At 

 Mineral Springs, Adams County, there are something over 40 

 feet of red and gray clay shales at the base of the Cuyahoga, 

 with a single 3-inch sandstone in the lower part, believed to be 



