188 ./. J- STEVENSON— CARBONIFEROUS OF APPALACHIAN BASIN 



Feet. Inches 



7. Concealed J? ° 



8. Sandstone, heavy [Buffalo] *> 



9. Fossiliferons black shale [Brush Creek] 5 



10. Brush Creek or Groff coal bed 1 



11. Concealed 5 ° 



12. Upper Freeport coal bed 



Red shale is not reported as associated with the Ames limestone in the 

 northern part of the county, and it was seen at that horizon in the south- 

 ern part only near the Belmont County line. The Harlem coal is re- 

 ported from one locality in northern Guernsey, where, according to Ste- 

 venson, it is roofed by cannel which is "full of aviculoid shells." For 

 the most part its place is concealed in sections by Andrews, but it is 

 reported by him twice in the southern part of the county at 12 to 18 feet 

 below the Ames. 



The Anderson coal bed of Andrews, Norwich of Stevenson, is at most 

 86 feet below the Ames, 10 feet above the Cambridge limestone, and is 

 persistent, having been seen in all parts of the county. The Cambridge 

 limestone is present throughout the western townships at 86 to 96 feet 

 below the Ames; it is below the surface in the eastern portion. The in- 

 terval from it to the Upper Freeport (locally Cambridge of Andrews and 

 Stevenson) varies from 91 to 137 feet, increasing toward the southern 

 border. The Brush Creek fossiliferons shales have not been observed in 

 I he interval between western Jefferson and central Guernsey, being re- 

 moved at most localities during deposition of the overlying Buffalo sand- 

 stone or sandy shale. The Brush Creek coal is worthless at all exposures 

 in Carroll, Harrison, and Guernsey, and the Lower Mahoning is usually 

 represented by shale. The average thickness of Conemaugh in this 



at] is about 350 feet— a decrease of almost 250 feet from McDonald, 



in Washington county of Pennsylvania.* 



[n Muskingum county, west from Guernsey, the section north from 

 I he Baltimore and Ohio railroad reaches upward to the Ames limestone. 

 The Harlem coal persists at 2 to 17 feet below that limestone and the 

 I iambridge limestone was seen at 09 feet below the Ames. The Anderson 

 l '" al : " ' to !) IV|,( above the Cambridge limestone is equally persistent 

 nul] ' "' Hai liin, but for the most part both beds are mere streaks. The 

 Cambridge limestone is fossiliferons, buff on weathered surface, aud 

 often flinty and is 127 feet above the Upper Freeport (Cambridge) coal. 

 Che Lower Mahoning, fully exposed at one place, consists of two sand- 

 stone plates, 20 and 7 feet, separated by 21 feet of mostly sandy shale. 



* HI. B. Andrews : Vol. ii, pp . 533.534, 535 . 539 54Q 

 J. J. Stevenson : Vol. ill, pp . o^os 

 E. Orton: Vol. v, pp. S2 84 87 



