THE SUNBURY SHALE OF OHIO 293 
SECTION OF ALUM ROCK. 
Total 
Thickness thickness 
No. feet. feet. 
6. Top of massive sandstone, capping first knob, which litholog- 
ically closely resembles the ‘“‘City ledge ”’ of Buena Vista region, 
while on top and in the upper part of the stratum are numerous 
specimens of SAzvrophyton similar to those described in the Lower 
Twin Creek quarry. The top of this sandstone, however, is 51 
feet above the top of the Berea sandstone, while in the Lower 
Twin Creek it is only 261% feet, so that it appears soméwhat 
doubtful whether these two exposures are in the same layer. 
Loose blocks of sandstone containing Spzrophyton occur at the 
elevation of 27 feet above the top of the Berea sandstone, and 
this layer perhaps represents the horizon of the ‘“‘ City ledge” as 
shown to the northwest of Buena Vista. All of this slope below 
the massive sandstone at top is covered - - - - seo) 423 
5. Thin, black, even argillaceous shale, 13 feet shown before it is 
covered by soil. Szsdury (Waverly black shale) = - SN 1s3 385 
4. Top of massive Berea sandstone; some of the layers thick, light 
gray in color, rather course grained and weathering brownish. 
Some of the layers have magnificent specimens of ripple marks. 
The layer just below the top one is 3 feet thick, and on the top 
surface are splendid ripple marks - - - - - =Sor 21 By 
3. Perhaps the rocks are mainly gray or greenish to bluish-gray 
shales, weathering to an iron color; but there are sandstone 
layers, some irregular or concretionary, often ripple marked, 
frequently thick, one of them 26 inches, and Spzrophyton occurs. 
Bedford formation - - - - - - - - - 95 351 
2. Covered. Plenty of yellowish iron stained arenaceous shales in 
soil. Perhaps all or the greater part of this zone belongs in the 
Bedford formation - - - - - - - - =) e2IT 276 
I. Black thin layered Ohio shale. Near the top of the shales are 
a few fossils, as a large Lingula. Partly covered slope, but 
probably all Ohio shale to the level of the Chesapeake and Ohio 
railroad; 255 feet by the barometer from railroad level to 
highest outcrop of shale - - - - - - - 255 255 
The Alum Rock section clearly shows that the Sunbury shale 
crosses the Ohio river, and has a thickness of at least 13 feet in 
the vicinity of Vanceburg. It was not followed farther south in 
Kentucky and at present it is not known how far it can be traced 
in that state. 
NORTHERN OHIO. 
From near Sunbury, Delaware county, northward there are no 
reported surface exposures of the Sunbury shale across Morrow, 
