FORT CASSlN BEDS OP DUTCHESS COUNTY, NEW YORK 491 



There are no important fossils in common in the two beds, except two or three 

 which are generally found in all calciferous fossiliferons beds. 



On the other hand, this layer is plainly related to the Fort Cassin beds in the 

 presence of the AsapJms canalis SiudSy atrophia lateralis of those beds in abundance, 

 and also probably of Lophospira cassi7ia. The stratigraphic relations of this layer 

 are as yet quite uncertain. The confused condition of the greatly folded and faulted 

 strata of Dutchess county have made it impossible to determine them as a question 

 of superposition. Its relations to the Fort Cassin beds seem to place it above the 

 Cyrtoceras vassarinum beds, in view of the more ancient types of the latter over 

 those of Fort Cassin ; yet the presence of quite a number of black linguloid fossils 

 resembling Lingulepis pinniformis, which do not occur in the vassarinum beds, sug- 

 gests a lower stratigraphic position. 



As there is much doubt about the true horizon of the Fort Cassin beds, the 

 results of further investigations in that vicinity will have an important bearing on 

 the stratigraphic relations of this Dutchess county layer. It differs remarkably 

 from the Fort Cassin beds in the extreme scarcity of cephalopods. 



Remarks upon Professor Dwight's paper were made by C. D. Walcott. 



The next paper was read by title : 



MIOCENE FAUNAS OF PATAGONIA 

 BY W. B. SCOTT 



The following paper was read by the author : 



QLACIATION OF THE WESTERN PENINSULA OF ONTARIO 

 BY F. B, TAYLOR 



Remarks were made by W. M. Davis and A. P. Coleman. 

 The next paper was also read b}^ the author: 



DEVELOPMENT OF THE BASAL ARMS OF CERTAIN CRINOIDS 

 BY A. W^ GRABAU 



Remarks were made by H. M. Ami and W. M. Davis. 



The three remaining papers of the program were read by title. 



THE A TCHISON DEEP WELL 



BY ERASMUS HA WORTH 



SAND CRYSTALS AND THEIR RELATION TO CERTAIN CONCRETIONARY FORMS 



BY E, H. BARBOUR 



The paper is printed as pages 165-172 of this volume. 



