April, 1909.] Conemaugh Formation in Southern Ohio. 483 



cipal horizons as seen in southern Ohio. The succession in 



descending order is: 



Pittsburg Coal Ft. In. 



. Cla^r 3 



Pittsburg Hmestone 4 



Shales, sandy 45 



Sandstone, massive 35 



Coal blossom 



Limestone, nodular 8 



Shales, sandy 50 



Shales, "Big Red," nodular ore and 



limestone -5 



Shale 5 



Ames Limestone, fossiliferous 1 8 



Coal blossom 



Shale 10 



Shale, " Pittsburg Red" 40 



Ewing limestone 6 



Shale 5 



Patriot Limestone, fossiliferous.. . . 6 



Shale, black 3 



Patriot coal 1 6 



Shale 15 



Sandstone, "First Cow Run" 25 



Shale 10 



Upper Cambridge Limestone, fos- 

 siliferous 2 



Coal, thin G 



Shale 5 



Lower Cambridge Limestone, fos- 

 siliferous 1 



Coal, thin 



Upper Mahoning sandstone 12 



Brush Creek Coal 1 



Clay 2 



Mahoning standsone, often shaly. ... 50 



Clay, with iron ore 7 



Shale 3 ^^j 



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"^ oil sand near Marietta. Sections in the Pan Handle 



8. Geol. Surv. Ohio, Vol. VIII, Bull. I, p. 30. 



