86 POTTSVILLE FAUNA OP OHIO 



Summary 



The Lower Mercer limestone, which forms the next faunal horizon 

 above the Boggs member, is the most widespread and persistent mem- 

 ber of the Pottsville formation and is found in every county where the 

 Pottsville -outcrops. It consists of hard, blue to black, fossiliferous 

 limestone which occurs characteristically in two benches either with or 

 without shaly partings. The hard limestone is generally associated 

 with or replaced by extremely fossiliferous, black calcareous shales or 

 impure shaly limestones. In thickness the member varies from less 

 than 1 foot to as much as 20 feet, with an average of about 3 feet. 

 The fauna is always abundant and is composed largely of pelecypods 

 and brachiopods, although it is characterized everywhere by a pro- 

 fusion of large crinoid stems. 



The complete list of fossils from the Lower Mercer member follows : 



Plantae 



Fusulina secalica (Say) 



Lophophyllum profundum (Milne-Edwards and Haime) 



Eupachycrinus mooresi (Whitfield) 

 Crinoid segments 



Archaeocidaris spines 



Tabulipora ohioensis (Foerste) 

 Chainodictyon laxum Foerste 

 Fenestellidae undetermined 

 Fenestella limbata Foerste 

 Fenestella remota Foerste 

 Fenestella shumardi Prout ? 

 Fenestella sp. 

 Polypora fastuosa Foerste 

 Polypora sp. 



Fenestellae undetermined 

 Pinnatopora whitii Foerste 

 Septopora biserialis (Swallow) 

 Septopora biserialis var. gracilis (Meek) 

 Rhombopora lepidodendroidea Meek 

 Rhombopora multipora Foerste 

 Streblotrypa merceri n. sp. 

 Cystodictya carbonaria (Meek) 

 Prismopora sereata (Meek) 



Lingula carbonaria Shumard 



Lingula kanawhensis Price 



Glossina waverlyensis (Herrick) 



Orbiculoidea meekana (Whitfield) ^ 



Orbiculoidea missouriensis (Shumard) 



Crania modesta White and St. John 



Rhipidomella pecosi (Marcou) 



Schizophoria altirostris (Mather) 



