TITLES OF PAPERS 701 



The next two papers were read by title : 



AGE AND GEOLOGIC RELATIONS OF THE SANKATY BEDS, NANTUCKET 



BY W. O. CROSBY 



AGE AND RELATIONS OF THE SANKATY BEDS 



BY H. W. SHIMER 1 



Then the following paper was read: 



SOME FEATURES OF THE WISCONSIN MIDDLE DEVONIC 

 BY H. F. CLELAND 



[Abstract] 



This paper gave the results of a study of all the outcrops, as far as known, 

 of the Wisconsin Devonic and their contained faunas. In it were discussed: 

 (1) the relation of the strata to those above and below, (2) the unconformities, 

 (3) the lithological characters, and (4) the character, relationships, and geo- 

 graphical distribution of the faunas. 



Charles Schuchert, A. W. Grabau, and H. M. Ami participated in the 

 discussion of this paper. 

 The next paper read was 



ICE-BORNE BOULDER DEPOSITS IN MID-CARBONIFEROUS MARINE SHELLS 



BY JOSEPH A. TAFF 



[Abstract] 



Great numbers of boulders and other erratic fragmental rock debris occur in 

 the Caney formation of the Ouachita Mountain region in southeastern Okla- 

 homa. The erratic material consists of boulders, cobbles, and small rock frag- 

 ments of three general classes, namely: (1) limestones — siliceous, argillaceous, 

 and magnesian; (2) flints, cherts, and (3) quartzites. 



The limestones are of various textures and colors, some of which partake of 

 the nature of the quartzites, while others are argillaceous ; others yet appear 

 to be dolomitic or perhaps dolomites. Many of the limestone boulders are 

 massive and homogeneous, while others are distinctly stratified and contain two 

 or more classes of limestone or strata of limestone and flint. 



Flint and chert boulders are also of common occurrence, and in places are 

 even more abundant than the limestone boulders. Certain of these flints are 

 stratified or bedded and are black or bluish in color, while others are massive, 

 chalcedonic in character, and contain inclusions of drusy quartz. Among these 

 are many of conglomeratic and brecciated nature. 



1 Introduced by W. O. Crosby. 



