ABSTRACTS OF PAPERS 73 



The second locality, about two miles northwest of Lone Oak, Hunt County, 

 shows the limestone of the Midway, with characteristic fossils, resting upon 

 the clays of the Navarro beds of the Upper Cretaceous, with characteristic 

 fossils. This is the second actually observed contact between these formations 

 to have been recognized. The other is on the Rio Frio, some four hundred 

 miles away. 



Accurate logs of oil prospecting wells show the thickness of the Gulf series 

 between these localities and along this latitude to be 3,100 feet. Stratigraphic, 

 paleontologic, and photographic details are given. 



B, Stratigraphic Position of the Buda Limestone of the South Texas 

 Sections and its Relationship to the North Texas Section 



This paper gives additional proof of the stratigraphic correspondence be- 

 tween the Buda limestones of the Colorado River section of Texas and the 

 Grayson and Main Street formations of north Texas. It likewise asserts that 

 the Buda formation is not synchronous with the Woodbine formation of north 

 Texas, as erroneously asserted by Bose and collaborators, but that the latter 

 lies above the former with a stratigraphic and paleontologic disconformity 

 between them. It likewise clears up a previously existing confusion, whereby 

 the Tamasopa formation of Mexico has hitherto been erroneously correlated 

 with the Woodbine instead of the Comanchean, to which it belongs. 



C. Changes of lithologic Phase in the Comanche Series adjacent to the 

 Rio Grande and Notes on the Recurrence of deeper Water 



Limestone Faunas 



Shows the persistence of key faunas of the several divisions of the Co- 

 manchean Cretaceous in sections between Red River and the Rio Grande of 

 Texas, accompanied by frequent interpolations of Rudistean limestones along 

 the latter. 



Presented in abstract extemporaneously 



PALEOZOIC BOCKS FOUND TX DEEP WELLS TX WISCOXSIX AXD XORTHERX 



ILLTXOJS 



l:Y F. T. THWAITES ^ 



(Ahstract) 



The paper discusses the formations found in deep wells from the lithologic 

 standpoint only. References to published material on the paleontology are 

 given. The formation names given to the subdivisions of the Cambrian by 

 Ulrich are here defined. Brief notes are given on the surface exposures of the 

 formations. All formations from the Devonian down to the Precambrian are 

 discussed, with special emphasis on the water-bearing Cambrian. The methods 

 by which the deeply covered formations were correlated with those exposed in 

 central Wisconsin are explained in detail. Several cross-sections illustrate 

 the paper. 



Eead by title. 



^ Introduced by W. O. Hotchkiss. 



