STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 63 



Marginifera muricata var. missouriensis Girty 



Marginifera wabashensis (Norwood and Pratten) 



Spiriferina kentuckyensis (Shumard) 



Spirifer cameratus Morton 



Spirifer opimus Hall 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



Pafallelodon carbonarius (Cox) 

 Entolium aviculatus (Swallow) 

 Allerisma terminale Hall 

 Pleurophorus immaturus Herrick 



Pharkidonotus percarinatus (Conrad) 

 Patellostium montfortianum (Norwood and Pratten) 

 Naticopsis ventricosus (Norwood and Pratten) 

 Sphaerodoma ventricosa (Hall) 



Pseudorthoceras knoxense (McChesney) 

 Endolobus (Temnocheilus ?) ortoni (Whitfield) ? 

 Epphipioceras sp. 



A collection of fossils also from Madison Township in the vicinity 

 of Adams Mills was borrowed for study from the Geological Museum 

 of The Ohio State University, and includes the following forms (Lo- 

 cality 42) : 



Crinoid segments 



Derbya crassa (Meek and Hayden) 

 Chonetes mesolobus Norwood and Pratten 

 Productus semireticulatus (Martin) 

 Pustula nebraskensis (Owen) 

 Marginifera muricata var. missouriensis Girty 

 Spiriferina kentuckyensis (Shumard) 

 Spirifer opimus Hall 

 Composita subtilita (Hall) 



Myalina recur virostris var. sinuosa n. var. 

 Pleurophorella costata (Meek and Worthen) 



- Schizostoma catilloides (Conrad) 



In Section 20, Muskingum Township, the Lower Mercer member 

 outcrops in the bed of Blunt Run where it is represented by two layers 

 of hard limestone separated by dark, shaly, very fossiliferous limestone. 

 The locality is one of the best for collecting purposes as it is easily ac- 

 cessible and the fossils abundant and can be obtained without diffi- 

 culty (Locality 27). The character of the deposit is shown in the 

 following geologic section: 



Feet Inches 



Limestone, shaly, fossiliferous *i f I 



Limestone, hard, fossiliferous I L(ywef Mercer 8 



Limestone, shaly, fossiliferous | 



Limestone, hard, fossiliferous I I 1 8 



Shale, with coal bands __ 6 



Coal, bony, Middle Mercer __ 8 



