48 rROCEEDINGS OK THE CHICAGO MEETING 



HEHCYNIAN OIWOENIC MOVEMENTS IN HOVTIIERN OKLAHOMA 

 BY R. C. MOORE 



{Abstract) 



The Glenn fonuntion, consisting of sliales, limestones, and more or less 

 asphaltic sandstones, is exposed on the south side of the Arbuckle Mountains 

 of southern Oklahoma. Recent studies show that it is 10,000 to 15,000 feet in 

 thickness, and that it is Lower Pennsylvanian in age. It is steeply folded and 

 is concordant in structure with the older strata exposed in the Arbuckle Moun- 

 tains. North of the Arbuckles are folded and tilted Lower Pennsylvanian 

 rocks comprising the formations from the Wapanucka to the Wewoka, 10,000 

 feet in thickness, which are also concordant in structure with the older beds 

 of the mountains. The beveled, peneplaned Lower Pennsylvanian is overlain 

 by the Franks conglomerate, in which, from interbedded limestones, an Upper 

 Pennsylvanian fauna has been found. The Franks has been traced northward 

 and found equivalent to the Seminole conglomerate which rests on the Wewoka 

 formation. An important unconformity which appears to correspond to the 

 break in sedimentation in the Arbuckle region has been recognized and traced 

 across the north Texas-Pennsylvanian area. It occurs near the base of the 

 Cisco group. 



The movement which produced the Arbuckle Mountains may be correlated 

 with the Hercynian disturbance in mid-Pennsylvanian time. It exerted a very 

 important influence on the structure, sedimentation, and faunas of the Penn- 

 sylvanian in the Mid-Continent region. 



Read from manuscript. 



FRAMEWORK OF THE EARTH 

 BY PETER MC KELLAR 



Read in abstract from manuscript. 



ORIGIN AND DISTRIBUTION OF THE LOESS 

 BY' G. FREDERICK WRIGHT 



{Abstract) 



I 



1. Analysis of typical loess in the Missouri Valley shows that it is the prod- 

 uct of mechanical disintegration rather than of chemical. It is composed 

 mostly of angular crystalline particles, among which are feldspar, hornblende, 

 oxides of iron, and tourmaline. This could not have come from the Mississippi 

 Valley west of the Missouri River. It is evidently the product of the mechan- 

 ical erosion of the continental glacier over the granitic areas of Canada and 

 the Lake Superior region. 



2. Reexamination of the specimens of Chinese loess collected by Pumpelly 

 fifty years ago probably points to a similar origin from the glaciated area of 



