70 PROCEEDINGS OF THE A XX ARBOR MEETING 



the Beaver River as far as the Beaver-AUegheiiy divide ; then down a tribu- 

 tary which enters the Alleglieny River near the northwestern corner of the 

 Foxburg quadrangle. The same section was then studied along the Allegheny 

 River from the northwest corner of the Foxburg quadrangle southward to the 

 mouth of -Redbank Creek, in the Kittaninny quadrangle. 



As a result of this study the writer believes that the upper Connoquenessing 

 and Homewood sandstones of the Beaver River-Pottsville section are equiv- 

 alent to the Homewood and Clarion sandstones respectively of the Alleghenj' 

 River section. It appears that the Pottsville formation of the Foxburg folio 

 should be extended to include the Clarion sandstone which is included in the 

 Allegheny formation, and that the top of the Clarion sandstone should be 

 regarded as the upper limit of the Pottsville formation in that region, because 

 it is the equivalent of the Homewood sandstone of the Beaver River section, 

 which is the first conglomerate-bearing member below the Allegheny forma- 

 tion. On the basis of this classification, the Scrubgrass. Clarion, and P>rook- 

 ville coals of the Allegheny formation in the Beaver River valley are eipiiv- 

 alent to the Upper Clarion. Lower Clarion, and Craigsville coals respectively 

 of the Foxburg-Clarion folio. 



A brief study of the same members between Mayport. near the southeastern 

 corner of the Clarion quadrangle, and Brookville. in Jefferson County, sug- 

 gested that the Craigsville coal of the Foxburg-Clarion folio is the equivalent 

 of the Brookville coal near Brookville. Detailed mapping of these members 

 between Mayport and Brookville will be necessary, however, before their rela- 

 tions can be established with certainty in that district. 



Presented in abstract extemporaneously. 



Discussion 



Dr. George H. Ashley: The problem has a broad bearing because affecting 

 the type locality. It is thought that the ditficulty has arisen partly through 

 misinterpretation of the rocks in the Kittaninny region by meiubers of the 

 United States Geological Survey. 



Further remarks were made by Mr. David White and Dr. I. C. WJiite, 

 with reply l)y the author. 



STRUCTURAL STUDY OF A PART OF XORTHEAST TEXAS WITH SOME 

 STRATJGRAJ'IIIC SECTIOXS 



BY F. JULirS FOHS A.ND MEATH M. KOBINSOX ^ 



{Alhyfract) 

 Part I. SxRATiGRArnY and Structure, by F. Julius Fohs 



Much new data on the geologic complex of northeast Texas is available 

 from drilling of several hundred wells (two hundred wildcats) and our own 

 study of the surface geology during the past five years. Fragmentary contri- 

 butions of much value have been made by others, but, based on more complete 

 data, we discuss general relatituiships and results. 



^ Introduced by Charles Schuchert. 



