OUTCROP IN OHIO 55 



and the Logan sandstone are in contact. The presence of the upper 

 shales is very doubtful, for the coal series begins at 5 to 20 feet above 

 the limestone; so that the upper shales may be regarded as absent, 

 unless indeed some part of the coal-bearing series be taken as their 

 equivalent. 



The Maxville limestone was discovered by Professor Andrews in 1869, 

 and was described by him in the Ohio annual report for that year, 

 where he identified it with the Lower Carboniferous limestone of Ken- 

 tucky. He observed it in western Muskingum and eastern Perry, 

 where it is 17 feet thick, with 4 feet of sandy shale between it and the 

 underlying Logan ; it evidently extended across Perry, for it is at least 

 10 feet thick in Fairfield; in Hocking county, 9 feet were seen at one 

 locality, with the bottom not reached ; in Vinton, where it is 16 feet and 

 rests directly on the Logan, it is partly brecciated ; 8 feet were seen in 

 Jackson county at 12 feet above the Logan ; no exposures were found in 

 Scioto county, but in northeast Greenup county of Kentucky, opposite 

 Scioto of Ohio, he obtained this section : * 



Coal measures: Feet 



Sandy clay with Coal Measures plants 8 



Limestone, pure, fossiliferous 31 



Limestone, highly sandy r 15 



Concealed 10 



Waverly sandstone 215 



Here the limestone shows its full characteristics, for above is the fos- 

 siliferous division and below the silicious limestone, as in Pennsylvania. 

 These are conspicuous farther south. The extent of the Maxville east 

 and northeast from central Ohio is not great, for in southern Noble, 

 the county adjoining Muskingum at the southeast, a record shows it 

 absent at Macksburg, where 21 feet of black shale intervene between the 

 Logan and Potts ville.f Professor Orton states that it is reported in some 

 of the well records in Jefferson, Noble, Monroe, and other counties in 

 eastern Ohio. This is perplexing, for the limestone is absent on the 

 Ohio opposite Steubenville, in Jefferson county, and at Macksburg, in 

 Noble county. 



Doctor Newberry states that in northwest Holmes county the Pottsville 

 conglomerate '' contains, mingled with its quartz pebbles, rather rudely 

 rounded masses of chert, generally 1 to 3 inches in diameter, which con- 

 tain Lower Carboniferous fossils." The presence of these fragments, he 

 thinks, shows that the Maxville limestone reached at one time nearly 



*E. B. Andrews : Ohio Reports, vol. iii, 1878, pp. 816-822. 

 fGeol.of West Virginia, vol. ii, p. 299. 



VIII— Bull. Geol. See. Am., Vol. 14, 1902 



