Maryland Gkological SuiiVEY 



103 



Spirifer macro pleuru^ is abundant only in tlie very cherty bods and is rare 

 below them, while species of Treniatospira are common in the upper lime- 

 stone strata. 



The New Scotland fissile shale is characterized by an abundance of 

 Dahnanella planiconvexa. 



Becraft Meniber. 

 Tlie Becraft member is restricted to so small an area in Maryland that 

 a detailed analysis of its faunules has not appeared valuable. 



CORRELATION WITH FORMATIONS OF OTHER AREAS 



Since the age of the Helderberg of Maryland involves the problem of the 

 age of the subjacent beds the correlation of the latter will be considered 

 first in treating the subject under discussion. 



The Helderberg is underlain by the Tonoloway formation which con- 

 sists of thin-bedded, platy limestone and interbedded calcareous shale. 

 Upon weathering the limestone yields thin, hard fragments which cover 

 the surface of the soil. Fossils are rare save in a few highly fossiliferous 

 beds. The fauna of the Tonoloway has not been studied critically up to 

 the present time. Among the most important species in it are the follow- 

 ing, according to the identifications of Ulrich : ^ 



Partial list of fossils from the lower portion of the Tonoloway limestone. 



Stromatopora sp. undet. 



Favosites globuliformis. 



Fistuliporella, thinly lamellose spe- 

 cies. 



Cyphotrypa, new lamellate species. 



Orthopora n. sp. (cf. O. regularis). 



Schuchertella hydraulica var. 



Meristella bella? 



Whitfieldella nucleolata. 



Rhynchospira globosa. 



Rhynchonella litchfieldensis. 



Rhynclionella hydraulica? 



Rhynchonella? lamellata. 



Hormotoma sp. undet. (resembles H. 

 gracilis). 



Tentaculltes gyracanthus. 



Calymene camerata. 



Leperditia alta. 



Leperditia altoides ?. 



Beyrlchia n. sp. (resembles Entomis 



flabellifer and E. oblonga). 

 Klcedenia n. sp. 

 Bollia (? Halliella) n. sp. (reticulated 



surface, loop obsolete). 

 Klcedenella clarkei. 

 Klcedenella halli. 

 Klcedenella (? Tetradella) cf. hiero- 



glyphica (Krause). 



Pawpaw-Hancock Folio, U. S. Geol. Survey, 1912, p. 7. 



