i>»Z PROCEEDINGS OF THE PHILADELPHIA MEETING 



stephanite, tetrahedrite, graphite, and other minerals. It will be noted that this 

 association of minerals is similar to that of deposits which have long been worked 

 in Germany. 



Remarks were made by B. K. Emerson. 



RELATIVE AGES OF THE ONEIDA AND SHAWANGUNK CONGLOMERATES 



BY A. W. GRABAU 



[Abstract] 



The Oneida and Shawangunk conglomerates represent different portions of a 

 basal conglomerate in the transgressing Siluric sea. The Oneida portion is of mid- 

 Medina age, the Shawangunk portion of Salina age. The bearing of these facts 

 on the paleogeography of Siluric time was presented. 



• 



NOTES ON THE ONTARIO, OR SILURIC, SECTION OF EASTERN NEW YORK 

 BY C. A. HARTNAGEL* 



[Abstract] 



The Cobleskill limestone is the term applied to the Coralline limestone of Hall. 

 Its stratigraphic position is just above the Salina. In southeastern New York and 

 New Jersey the Cobleskill grades into the highly fossiliferous Decker Ferry forma- 

 tion. The occurrence of Eurypterus in western New York, in strata between beds 

 which contain representatives of the Cobleskill fauna, shows that the Decker Ferry 

 fauna lived in eastern New York before the Eurypterus fauna had entirely been 

 replaced in western New York. Since the Cobleskill is above the Salina, the so- 

 called Clinton quartzites, Medina shales, and the Shawangunk grit of eastern New 

 York may be regarded as Salina in age. 



The paper was discussed by J. M. Clarke, H. M. Ami, Gilbert van 

 Ingen, and A. W. Grabau. 



PALEOGRAPHY OF SAINT PETER TIME 



BY CHARLES P. BERKEY 



STRATIGRAPHY OF THE UINTA MOUNTAINS 



BY CHARLES P. BERKEY 



Remarks were made by H. M. Ami. The paper is printed as pages 

 517-532 of this volume. 



HELDERBERG SEAS AND RELATIONSHIP OF LOWER DEVONIC STRATA OF 

 EASTERN UNITED STATES 



BY A. W. GRABAU 



The paper was discussed by Stuart Weller, Charles Schuchert, Gilbert 

 van Ingen, H. M. Ami, H. S. Williams, and B. K. Emerson. 



♦Introduced by A. W. Grabau. 



