STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 45 



formation, and where characteristically developed, is less than 2 feet 

 in thickness, hard, blue, and fossiliferous, closely resembling the Lower 

 Mercer limestone, from which it is separated by an interval of about 

 22 feet. It is notably variable in character, however, and may be 

 interbedded with or replaced by flint, shale, sandstone, or iron ore. 

 North of Frazeysburg it is entirely replaced by iron ore, while in Tus- 

 carawas County, it is represented by limestone. In southern Ohio the 

 Boggs member is an iron ore varying in thickness from 6 inches to 6 

 feet. It is of good quality, and was formerly mined for smelting in 

 the old charcoal furnaces. 



A list of the fossils collected from the Boggs member follows: 



Plant leaves 

 Lepidodendron sp. 



Crinoid segments 



Eupachycrinus mooresi (Whitfield) 



Tabulipora ohioensis (Foerste) 

 Fenestella shumardi Prout? 

 Septopora biserialis (Swallow) 

 Rhombopora lepidodendroidea Meek 



Lingula carbonaria Shumard 



Orbiculoidea missouriensis (Shumard) 



Orbiculoidea capuliformis (McChesney) 



Derbya crassa (Meek and Hayden) 



Chonetes choteauensis Mather 



Chonetes mesolobus Norwood and Pratten 



Productus cora d'Orbigny 



Productus semireticulatus (Martin) 



Productus semireticulatus (Martin) var. 



Pustula nebraskensis (Owen) 



Pustula punctatus (Martin) 



Marginifera wabashensis (Norwood and Pratten) 



Spiriferina kentuckyensis (Shumard) 



Spirifer boonensis Swallow? 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



Composita sp. 



Edmondia peroblonga Meek and Worthen 



Edmondia sp. 



Leda bellistriata Stevens 



Leda prolongata n. sp. 



Parallelodon carbonarius (Cox) 



Parallelodon tenuistriatus (Meek and Worthen) 



Aviculopinna americana Meek 



Myalina pernaformis Cox 



Naiadites elongata Dawson 



Schizodus affinis Herrick 



Schizodus amplus Meek and Worthen 



Schizodus curtus Meek and Worthen 



