April, 1909.] Conernaugh Formation in Southern Ohio. 
483 
cipal horizons as seen in southern Ohio. The succession in 
descending order is: 
Pittsburg Coal Ft. In. 
Clay. 3 
Pittsburg limestone. 4 
Shales, sandy. 45 
Sandstone, massive. 35 
Coal blossom 
Limestone, nodular. 0 8 
Shales, sandy. 50 
Shales, “Big Red,” nodular ore and 
limestone. 25 
Shale. 5 
Ames Limestone, fossiliferous. 1 8 
Coal blossom 
Shale. 10 
Shale, “Pittsburg Red”. 40 
Ewing limestone. 0 6 
Shale. 5 
Patriot Limestone, fossiliferous.... 0 6 
Shale, black. 3 
Patriot coal. 1 G 
Shale. 15 
Sandstone, “First Cow Run”. 25 
Shale. 10 
Upper Cambridge Limestone, fos¬ 
siliferous . 2 
Coal, thin. () (> 
Shale. 5 
Lower Cambridge Limestone, fos¬ 
siliferous . 1 0 
Coal, thin. 
Upper Mahoning sandstone. 12 4 
Brush Creek Coal. 1 
Clay. 2 
Mahoning standsone, often shalv.... 50 
Clay, with iron ore. 0 7 
Shale. 3 
Upper Freeport Coal. 
The Pittsburg limestone lies from 2 to 20 feet below the 
Pittsburg coal. It is white or grayish in color and contains a few 
minute fossils. In southern Athens County a thickness of over 
15 feet is attained but farther south 3 feet is uncommon. 
The massive sandstone, the base of which lies about 90 feet 
below the Pittsburg coal, is probably the equivalent of the 
“ Mitchell ” 8 oil sand near Marietta. Sections in the Pan Handle 
8. Geol. Surv. Ohio, Vol. VIII, Bull. I, p. 30. 
