STRATIGRAPHY OF POSSILIFEROUS MEMBERS 85 



at Lowellville. The characteristic two benches are present, the lower 

 containing abundant fossils. Dr. Newberry in his section measured on 

 Grindstone Run in 1878 records a thickness of one foot for the lime- 

 stone. 1 The section below was measured at the same locality in 1919 

 (Locality 22) : 



Section on Grindstone Run at Lowellville, Mahoning County 



Feet ' Inches 



Limestone, Upper Mercer 2 



Covered 3 



Clay, exposed along railroad 1 



Covered 9 



Sandstone and shale, sandy 5 



Shale 5 



Ore, nodular, Lower Mercer __ 4 



Limestone 1 f 2 1 



Limestone, very f ossilif erous j- Lower Mercer <__ 5 



Shale, black J [ ._ 4 



Shale, gray, clay 2 8 



Coal, bony __ 2 



Clay, bluish-gray, flinty 4 



Shale, gray, siliceous 3 6 



Covered 5 



Shale, gray, siliceous 6 



Shale, bluish-gray 3 6 



Covered 30 



Sandstone, thin-bedded 6 



Shale, arenaceous, ferruginous 28 6 



Shale, black, fissile, calcareous 2 4 



Limestone, Lowellville 2 



Covered _.. 19 



Sandstone, massive, coarse-grained 10 



The fossils listed below were found: 



Crinoid segments 



Derbya crassa (Meek and Hayden) 



Chonetes mesolobus Norwood and Pratten 



Productus cora d'Orbigny 



Productus semireticulatus (Martin) 



Pustula nebraskensis (Owen) 



Marginifera wabashensis (Norwood and Pratten) 



Spirifer cameratus Morton 



Spirifer boonensis Swallow ? 



Spirifer opimus Hall 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



'See section at Grindstone Run included under discussion of the Lowellville 

 member, p. 34. 



