34 POTTSVILLE FAUNA OP OHIO 



Derbya crassa (Meek and Hayden) 

 Chonetes choteauensis Mather 

 Productus cora d'Orbigny 

 Productus semireticulatus (Martin) 

 Spirifer opimus Hall 

 Composita subtilita (Hall) 



Pseudorthoceras knoxense (McChesney) 



The member is also well exposed along Symmes Creek about one 

 mile from its mouth, where it has a thickness of 6 inches, but no collec- 

 tions of fossils were made. 



Coshocton County. The member outcrops near the headwaters 

 of Opossum Run in the southwestern part of Washington Township 

 and is composed of the following strata: 1 



Feet Inches 



Ore, siliceous, sparingly fossiliferous, thickens to 8 inches in 



places -- 3 



Shale, gray 1 f 1 



Shale', dark, calcareous, fossiliferous ? Poverty Run 4 __ 10 



Limestone, gray, very fossiliferous J [, __ 3 



Coal, bony, Vandusen ... 8 



Mahoning County. The only known outcrops of Lowellville lime- 

 stone, north of Coshocton County, are found in Mahoning. At Lo- 

 wellville fossils were collected from the limestone and the associated 

 dark shale, where they occur in great abundance and in an excellent 

 state of preservation (Locality 22). The section given by Dr. New- 

 berry in 1878 from Grindstone Run, Lowellville, follows: 2 



Section on Grindstone Run, Lowellville, Mahoning County 



Feet Inches 



Earth with drift bowlders __ 



Limestone (Putnam Hill) 14 



Shale and sandstone 50 



Coal__ -_ 8 



Fire clay 2 



Shale 32 



'Coal r ._ 6 



Fireclay 2 



Coal 1 



Fireclay 2 



Limestone (Upper Mercer) 3 



Coal 1 3 



Fire clay 8 



Shale and sandstone.-. 36 



'Stout, W., Geol. Surv. Ohio, Fourth Ser., Bull. 21, p. 64, 1918. 

 2 Newberry, J. S., Geol. Surv. Ohio, Vol. Ill, opp. p. 804, 1878. The words in 

 parentheses have been supplied by the writer. 



