ABSTRACTS OF TAPERS 153 



• STRATA NEAR STUART, IOWA 

 BY JOHN L. TILTON 



(Abstract) 



In the early work on Guthrie County the strata near Stuart were assigned 

 to the Kansas City division of the Missouri stage, as if a continuation of the 

 strata well exposed in the quarries at Earlham, a few miles to the east. 



The present writer has found that the Thurman- Wilson fault, which he had 

 traced through Montgomery and Cass counties into Adair County, extends 

 between Earlham and Stuart, the upthrow on the Stuart side, and the strata 

 there and to the west to be of the lower Des Moines stage (Appanoose or 

 Henrietta) and not Kansas City strata.- This area is thus divided by a fault, 

 which accounts for the peculiar distribution of coal on the two sides of the 

 fault and remakes the geological map of Iowa in a considerable area. 



Read from manuscript. Illustrated by a wall map. 



ENVIRONMENT OF THE EARLY PERMIAN INSECTS OF KANSAS 



BY CARL O. DUNBAR 



(Abstract) 



During the summer of 1921 the speaker restudied Sellards' unique fossil 

 insect locality in Dickinson County, Kansas. A very large collection of insects 

 was secured and the associated geologic phenomena were studied. The occur- 

 rence of the fossils will be described and conclusions drawn as to the environ- 

 ment in which these insects lived. 



Presented without notes, with lantern-slide illustration. 

 Discussed by J. J. Galloway, Charles Schuchert, and George H. Chad- 

 wick. 



SOME CAVERN DEPOSITS IN THE PERM! A N IN WEST TEXAS x 



BY J. A UDDEN 



A few years ago I reported the presence of some Cretaceous foraminifera 

 that occurred in samples from a boring made near the center of the south line 

 of survey 24, block 110, in the public-school lands in Culberson County. These 

 were found below Permian limestones at a depth of 141 to 144 feet, and again 

 at a depth from 180 to 213 feet. Textularias, Globigerinas, Bulimina, Anoina- 

 lina were noted. Dr. Joseph A. Cushman, who kindly examined the material, 

 said that these fossils were more likely to be Mesozoic than Paleozoic. The 

 fossils came from marly shale and sand and were associated with some pebbles 

 of quartz and some sandstone. The geology of the region was but little known 

 at that time and the explanation of the occurrence of Mesozoic fossils in what 

 was known as a late Permian series of rocks remained a puzzling problem. 2 



1 Manuscript received by the Secretary November 1, 1921. 



2 J. A. Udden : The age of the Castille gypsum and the Rustler Springs formation. 

 Am. Journ. Sci., vol. 40, August, 1015, pp. 151-150. 



