DEVONIAN AND CARBONIFEROUS IN NEW YORK 531 



LOCAL PEBBLE BEDS 



During the reconnaissance locally developed pebbly beds, usually only a few 

 inches in thickness, were found at several points. These thin pebbly beds occupy 

 no definite horizon, but apparently may occur almost anywhere in the Cattaraugus 

 or Oswayo formations. In no case was any one of them found to be persistent or 

 to possess any stratigraphic importance. They were revealed usually by chance in 

 some unusually good exposure in a railway cutting, by the roadside, or along a 

 stream bank, and would ordinarily have entirel)^ escaped observation. It is possible 

 that at some point in the region such a pebbly bed may thicken into a locally promi- 

 nent stratum and become a source of perplexity and possible error in tracing the 

 stratigraphy if no nearby measure to a known horizon were obtainable as a check. 



FCCOIDS 



Fucoidal remains in the shape of vertical tubes piercing the sandstone or con- 

 glomerate layers of the Salamanca are especially characteristic of that horizon, 

 and in its northeastern portion were often used as an aid in its identification, 

 though in all cases of doubt reliance was placed in its invertebrate fauna. South- 

 westward, in Warren county, Pennsylvania, while vertical fucoidal remains are 

 still often very prominent in the Salamanca, they also occur at other horizons, 

 and hence if they may be used at all in that region as an aid in identification, it 

 must be done only with a recognition of this fact in mind. 



Remarks on Professor Glenn's paper were made by J. M. Clarke, H. S. 

 Williams, T. C. Hopkins, David White, and the author. 



At 12.45 p m the Society adjourned for the noon recess and convened 

 at 2.10 o'clock, President Winchell in the chair. The first paper of the 

 afternoon session was 



STRATIGRAPHIC RELATIONS OF THE RED BEDS TO THE CARBONIFEROUS AND 

 PERMIAN IN NORTHERN TEXAS 



BY GEORGE I. ADAMS 



This paper is printed as pages 191-200 of this volume. 



The President asked Professor W. M. Davis to take the chair. The 

 second paper was read as follows : 



COMPARISON OF STRATIGRAPHY OF BIG HORN MOUNTAINS, BLACK HILLS, AND 

 ROCKY MOUNTAIN FRONT RANGE 



BY N. H. DARTON 



A short abstract is printed in Science, volume xvii, page 292. 

 The third paper was the following : 



AGE OF THE ATLANTOSA URUS BEDS 

 BY WILLIS T. LEE* 



\_ Abstract] 



The paper dealt with the extension of the Atlantosaurus shales from their type 

 localities along the Rocky Mountain front southward into New Mexico and east- 



* Introduced by W. B. Clark. 



