110 POTTSVILLE FAUNA OF OHIO 



Crinoid segments 

 Fenestella shumardi Prout ? 



Derbya crassa (Meek and Hayden) 



Chonetes mesolobus Norwood and Pratten 



Productus cora d'Orbigny 



Productus semireticulatus (Martin) 



Pustula nebraskensis (Owen) 



Pustula symmetricus (McChesney) 



Marginifera muricata var. missouriensis Girty 



Marginifera wabashensis (Norwood and Pratten) 



Spirifer boonensis Swallow ? 



Spirifer opimus Hall 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



Prothyris elegans Meek 

 Crenipecten foerstii Herrick 



Sphaerodcma brevis (White) 

 Sphaerodoma ventricosa (Hall) 



Stark County. In the central part of Stark County the limestone 

 is well exposed in the valley of Nimishillen Creek and a good collecting 

 place is afforded in the central part of Section 34, Canton Township, 

 south of the village of North Industry. The limestone here is hard, 

 dark, fossiliferous, and about 2 feet in thickness. The following geo- 

 logic section shows the succession of strata in this vicinity (Locality 74) : 



Feet Inches 



Allegheny formation 



Coal, Brookville _ 1 6 



Pottsville formation 



Clay, gray _ 6 



Shale and covered 19 3 



Shale ._ - -- 30 



Ore, Upper Mercer 2 



Limestone, dark, fossiliferous, Upper Mercer. _ ; 2 



Coal, bony, Bedford 1 4 



The following fossils were collected here: 



Fusulina secalica (Say) 

 Crinoid segments 



Chonetes mesolobus Norwood and Pratten 



Productus cora d'Orbigny 



Productus semireticulatus (Martin) 



Pustula nebraskensis (Owen) 



Marginifera wabashensis (Norwood and Pratten) 



Spirifer opimus Hall 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



