MARYLAND GEOLOGICAL SURVEY 165 



Fauna of Sinuites Bed in Mercersburg Quadrangle, Pennsylvania 



Hindia parva Ulrich 

 Lingula riciniformis Hall 

 Leptobolus ovalis n. sp. 

 Dalmanella testudinaria (Dalman) var. 

 Dalmanella edsoni n. sp. 

 Christiania lamellosa n. sp. 

 Strophomena sculpturata n. sp. 

 Leptaena tenuistriata Spwerby var. 

 Tripleciv, (Cliftonia) simulatrix n. sp. 

 Scenidium ? merope (Billings) 

 Cyrtolitina nitidula (Ulrich) 

 Microceras inornatum (Hall) 

 Sinuites cancellatus (Hall) 

 Sinuites granistriatus (Ulrich) 

 Strophostylus textilis Ulrich and Scofield 

 Cyclora hoffmanni Miller 

 Cyclom minuta Hall 

 Cyclora parvula (Hall) 

 Eccyliomphalus trentonensis (Conrad) 

 Coleolus iowensis James 

 Orthoceras junceum Hall 

 Spyroceras bilineatum (Hall) 

 Cryptolithus tesselatus Green 

 Triarthrus becki Green 

 Illaenus americanus Billings 

 Cyphaspis matutina Ruedemann 

 Amphilichas trentonensis (Conrad) 



The complete list of identified species in the Sinnites bed with their 

 occurrence in the best localities for collecting in southern Pennsylvania is 

 shown in the table on next page. 



Fauna, of the Lower Martinsburg Shale (Corynoides Bed of Trenton 

 Age). Thirty feet or more of unfossiliferous black calcareous shale and 

 thin-bedded limestone overlie the Sinuites bed and are in turn followed by 

 a fossiliferous zone crowded with graptolites and other organisms, some of 

 which have a Utica aspect, although the majority are known in the Tren- 

 ton limestone. The abundant occurrence of the small, peculiar graptolite 

 Corynoides calicularis in this zone occasions its name. A second char- 



