720 ABSTRACTS OF PAPERS 



feet. The lower portion is chiefly sandstone and shale; the upper, limestone. 

 Work done recently shows that there is an abrupt change of fauna at the top 

 of the lower portion as thus defined, and that only the lower portion belongs 

 to the Chazy (Upper Chazy). The upper portion contains two members, the 

 lower of which is apparently to be correlated with the Pamelia limestone of 

 New York and the upper with the Lowville. If these correlations are correct, 

 then the Frontenac axis was not effective as a barrier after the close of Chazy 

 time, and the Pamelia is younger than the Chazy, instead of being equivalent 

 to the lower part of the Upper Chazy. 



FRANKFORT AND UTICA SHALES OF THE MOHAWK VALLEY 

 BY RUDOLF RXJEDEMANN 



{Abstract) 



The Utica shale of the Lower Mohawk Valley consists of two divisions. 

 The lower one of these (Canajoharie shale) is of Upper Trenton age. It thins 

 out rapidly westward and is absent at Utica. The typical Utica shale some- 

 what changes its faunal character eastward. The Frankfort shale thickens 

 enormously eastward, also becoming coarser and indicative of near-shore 

 conditions. It has furnished a considerable fauna (among others a new 

 eurypterid fauna of eleven species), which proves it to be a later development 

 of the Utica and not of Lorraine time. It is also divisible into two stages, 

 the upper one (Indian Ladder beds) carrying a different fauna and being 

 present only in the ea^t. 



STRATIGRAPHY OF THE LOWER PENN8YLVANIAN OF NORTHEASTERN 



OKLAHOMA 



BY D. W. OHERN^ 



(Abstract) 



The area discussed lies between the Kansas line on the north and the Arkan- 

 sas River on the south ; and between western limit of the Boone chert on the 

 east and the 96th meridian on the west. Over the entire region, embracing 

 some 3,700 square miles, the rocl^s dip gently westward. Shales predominate, 

 becoming arenaceous toward the Arl?:ansas River. Limestones thin and sand- 

 stones thiclien southward. The whole series is between 1,500 and 2,000 feet 

 or more in thickness. 



The following formations have been established, beginning with the oldest: 



Feet. 



Vinita formation, shales, sandstones, limestone lentils 450 to 1,200 



Claremore formation, three limestones and two intervening 



shales 100 



Labette shale 150 



Oolagah formation, limestone split by a shale lentil to 



northward 100 



Nowata shale, containing at least one bed of coal 50 to 100 



Introduced by C. N. Gould. 



