96 PROCEEDINGS OF THE PHILADELPHIA MEETING 



neuth the Huron shale in that region, represents tlie Encrinal limestone of the 

 Thedford, Ontario, region and probably also the similar layer along EighteeJi- 

 mile Creek in New York. The thinning in the Hamilton beds from Thedford 

 southward to Sandusky is thei'efore either l)y disappearance of the upper por- 

 tion of the Hamilton, thus allowing the Huron to rest directly on the Encrinal 

 limestone, or the lower part of the Huron shale itself must represent the upper 

 Hamilton beds. Indications to the southward from Sandusky are that the 

 Huron is continually lapping over on older beds, while the fossils in the lower 

 Huron south and east of Sandusky indicate that this deposit is about the age 

 of the black shale at Kettle Point. Ontario. The Huron shale, therefore, rests 

 unconformably on the Encrinal or Prout limestone of northern Ohio and the 

 whole upper Hamilton is wanting. 



Presented by title in the aljsence of the author. 



DIASTROPHIC IMPORTAlSlCE OF THE Vy CONFORMITY AT THE BASE OF THE 



BEREA SANDSTONE IN OHIO 



BY H. P. CUSHING 



f 



(Abstfact) 



By description of the character of the unconformity at the base of the Berea 

 sandstone in Ohio the attempt was made to show that the break between the 

 Berea and the underlying Bedford shale must be a trifling one, involving no 

 great lapse of time, and hence of slight diastrophie importance. 



Eead in full from manuscript. 



Discussed by Messrs. David White, Charles S. Prosser, and A. W. 

 Grabau. The discussion was discontinued so that the papers by Messrs. 

 Ulrich and Grabau could be considered together with tliis one. 



KINDERHOOKIAN AGE OF THE CHATTANOOGAN SERIES 



BY E. O. ULEICH 



iAl)Stract) 



Recent discoveries in Tennessee and Missouri tend to show that the shale 

 and sandstone formations comprised in the Chattanoogan series, as defined by 

 the author in 1912, are really younger than was then supposed. Judging from 

 the data then in hand, the Chattanoogan was wholly removed from the De- 

 vonian system and placed as a new series at the base of the Waverlyan (Lower 

 Mississippian) system. With the new evidence, it now appears that the Chat- 

 tanoogan is approximately contemporaneous with the Kinderhookian series of 

 the Mississippi Valley. The principal data on which this conclusion is based 

 are as follows : 



1. In Tennessee and Kentucky the Chattanoogan shale is commonly suc- 

 ceeded by the New Providence shale. At many other places in these States, 

 particularly in Tennessee, the top of the Chattanooga is in contact with the 

 Fort Payne chert. At a few places, however, a third formation — the Ridge- 



