Maryland Geological Sukvey 75 



south Atlantic and Gulf states, although the characteristic Eancocas 

 species, Terebratula harlani, has been questionably determined in mate- 

 rials obtained from the deep-well borings at Old Point Comfort, Virginia. 

 The Eancocas fauna points to the Danian age of this formation. 



The Eancocas fauna has not been discovered in Maryland, although it is 

 quite well represented in Delaware in the vicinity of Odessa. The diag- 

 nostic features of the fauna are essentially those of the Yincentown of 

 New Jersey — a prolific bryozoan fauna, Terebratula liarlani in abun- 

 dance, and a very meager mollusean representation. The mollusca of the 

 two areas are curiously dissimilar, none of the few characteristic species 

 of New Jersey, Cardium knappi, Carvatis veta, Polorthis tibialis, occur- 

 ring in Delaware, while the abundant Gryphcea, to which the character- 

 istic Vincentown bryozoa attach themselves, is apparently not present in 

 New Jersey. It is probable that the Delaware Eancocas represents a 

 fossil oyster bank where the ensemble of the life was, as it is to-day, very 

 distinct from the fauna a short distance removed from the bank. 



In the coarse greensands in the vicinity of Nosontown Pond a very 

 prolific fauna occurs, but in such a wretched state of preservation that but 

 little attempt has been made to give it a place in the literature. No trace 

 of Terebratula harlani could be detected, nor are any of the diagnostic 

 species of the Eancocas recognized. It is, apparently, a very much local- 

 ized inshore assemblage, the two most prolific constituent species being an 

 undescribed Yoldia and an undescrihed Ph acoides. 



