STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 59 



The fossils listed below were collected from the hard limestone: 



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 opimus Hall 



Composita subtilita (Hall) 



Fossils were also obtained from outcrops of Lower Mercer lime- 

 stone in a small ravine on the east side of the Muskingum River op- 

 posite Ellis where the following geologic section was measured (Locality 

 38): 



Feet Inches 



Coal, good, Upper Mercer ________________________________ 1 2 



Clay ________ _ _______________ __ _________ '- ___________ _-- 1 4 



Shale, siliceous ________ _ ______________________ , _________ 10 6 



Limestone, shaly 



Limestone, hard_ _ _ _ . Lower Mercer _ _ 7 



_ 

 Shale ______________ 



Limestone, hard ______________ _ _______ J ^ 1 8 



The collection of fossils from this locality includes the following 

 forms : 



Crinoid segments 

 Fenestella shumardi Prout? 



Orbiculoidea meekana (Whitfield) 



Derbya crassa (Meek and Hayden) 



Chonetes mesolobus Norwood and Pratten 



Productus cora d'Orbigny 



Productus semireticulatus (Martin) 



Pustula nebraskensis (Owen) 



Pustula punctatus (Martin) 



Marginifera muricata var. missDuriensis Girty 



Marginifera wabashensis (Norwood and Pratten) 



Spirifer cameratus Morton 



Spirifer opimus Hall 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



Leda bellistriata Stevens 

 Leda meekana Mark 

 Aviculopecten herzeri Meek 

 Deltopecten occidentals (Shumard) 

 Acanthopecten carboniferous (Stevens) 

 Entolium aviculatus (Swallow) 



