104 The Lower Devonian Deposits of Maryland 



Fossils from the upper 50 feet of the Tonoloway limestone. 



Stropheodonta bipartita. 



Spirifer corallinensis. 



Spirifer eriensis. 



Tentaculites gyracanthus. 



Klcedenia cf. nearpassi. 



Klcedenia sussexensis var. j Bythocypris cf. concinna. 



Halliella ? cf. seminulum. 



Primitia humilis ? 

 Kloedenella clarkei. 

 Kloedenella (? Tetradella) hierogly- 



phica. 

 Octonaria n. sp. 



One of the most conspicuous members of the fauna is Tentaculites gyra- 

 cantlms which occur so profusely in the Manlius of New Yorlv as to have 

 led the early geologists of that State to call the Manlius the Tentaculite 

 limestone. The Tonoloway limestone also resembles the Tentaculite 

 limestone lithologically, being hard thin-bedded and somewhat argilla- 

 ceous. These facts led Eowe' to correlate it with the Manlius and to 

 include it in the Helderberg of Maryland as was done by Hall in the case of 

 the Manlius of New York. Schuchert/ on the contrary, correlated it with 

 the Salina of New York, in part. Ulrich has recently expressed the 

 opinion that it is equivalent in a broad way to the Cobleskill and typical 

 Manlius, " although the fauna indicates that the Tonoloway sedimenta- 

 tion in Maryland in part preceded that of the Manlius and Cobleskill of 

 New York." ^ He also states that most of the diagnostic species of the 

 Tonoloway occur in the Schoharie Valley between the base of the Cobles- 

 kill and the top of the Manlius. The fauna of the Tonoloway differs, how- 

 ever, in many respects from that of the Manlius and particularly from the 

 Cobleskill fauna, as shown by the absence or great rarity of many of the 

 most characteristic species of those fonnations. This fact renders the 

 correlation of the Tonoloway with them very uncertain. Indeed, it may be 

 questioned whether present knowledge permits its correlation with any of 

 the formations of New York with precision. It is also possible that the 

 Tonoloway is not represented by any unit in New York. Definite correla- 

 tion with the New York section is therefore not attempted in this place 

 pending a fuller investigation of the problem. It is, however, clearly of 



' Op. cit. 



"Proc. U. S. Nat. Mus., vol. xxvi, 1903, p. 415. 



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



