TITLES AND ABSTRACTS OF PAPERS 93 



passes laterally into tlie porous strata which bear them. This implies, of 

 course, that the respective formations must be in replacing relationship, either 

 that of replacing overlap or an interfingering relation. The Utica shale, in 

 the larger sense, has a replacing overlap relation to the Trenton limestone 

 and is the source of the oil of that rock. In the east the Trenton horizon is 

 black shale, rich in carbonaceous matter. Westward it passes laterally into 

 Trenton limestone, though at any one locality Lower Trenton limestone is 

 overlain by higher "Utica" shale. Each division of the black shale, however, 

 passes westward into limestone, and the passage of the oil was from the shale 

 where it originated along the bedding planes into the limestones, where it was 

 stored. The Marcellus shale has the same relation to the Onondaga limestone 

 and is the source of the oil of that formation. The Portage and Chemung 

 sands of the Bradford region apparently derive their oil from the black shales, 

 which replace them westward and which in Ohio form the black Ohio shale, 

 which, as I have elsewhere shown, is a stratigraphic equivalent. The Berea 

 oil appears to be derived from a part of the Chattanooga black shale, which 

 replaces it to the southward. This relationship, too, I have elsewhere demon- 

 strated. 



Read by title in the absence of the author. 



REVISION OF THE MISSISSIPPIAN FORMATIONS OF THE UPPER 

 MISSISSIPPI VALLEY 



BY STTJART WELLER AND FRANCIS M. VAN TUYL 



(Al)stract) 



In accordance with the cooperative plan of study and correlation of the 

 Mississippian formations of the Mississippi Valley, furthered by the several 

 State Geological Surveys of the region, the writers have been occupied with 

 the investigation of these deposits in Iowa and western Illinois since 1913. 

 As a result of these studies, more complete data bearing on the composition 

 of the faunas of the more important horizons has been obtained and a revision 

 of the boundaries of certain formations has been necessitated. 



Read by title in the absence of the author. 



NOTES ON THE STRATIGRAPHY AND FAUNAS OF THE LOWER 

 KINDERHOOKIAN IN MISSOURI 



BY E. B. BRANSON 



{AJ^stract) 



A thin sandstone, which rests unconformably on various older formations, 

 is the usual basal Kinderhookian, but in some places shales come in below the 

 sandstone. The sandstone seems to correspond to the Sylamore of Arkansas.. 

 Fish remains are of common occurrence in the sandstone, while marine inver- 

 tebrates have been found in only one locality. 



Presented in full extemporaneously. 



Remarks were made by Dr. E. 0. Ulrich, with reply by the author. 



