TITLES OF PAPERS 621 



PRIMARY ORIGIN OF THE FOLIATED STRUCTURE OF THE LAURENTIAN 



GNEISSES 



BY FRANK D. ADAMS AND ALFRED E. BARLOW 



RELATIONS OF PRESENT PROFILES AND GEOLOGIC STRUCTURE IN THE 



DESERT RANGES 



BY CHARLES R. KEYES 



DEFLATION AND THE RELATIVE EFFICIENCIES OF EROSIVE PROCESSES 

 UNDER CONDITIONS OF ARIDITY 



BY CHARLES R. KEYES 



Then was read 



UNCONFORMITY SEPARATING THE COAL-BEARING ROCKS IN THE RATON 



FIELD, NEW MEXICO 



BY WILLIS THOMAS LEE 



This paper has been published as pages 357-368 of this volume. 

 The next paper read was 



EVIDENCE OF FORMER CONNECTION BETWEEN THE EASTERN AND WESTERN 

 COAL FIELDS ACROSS CENTRAL KENTUCKY 



BY ARTHUR M. MILLER* 



[Abstract] 



It has been a view entertained by a number of students of Kentucky geology 

 that the absence from the highest crest of the Cincinnati anticline of later than 

 Ordovician up to and including the Lower Coal Measure rocks is due in the 

 main to their removal by denudation rather than to lack of deposition. 



This was the opinion of Professor Shaler, who recurred to this subject again 

 and again in the publications of the Kentucky Geological Survey while he was 

 State Geologist, and later referred to it in his article "The origin and nature of 

 soils," published in the Twelfth Annual Report of the U. S. Geological Survey. 

 In this view he was supported by W. M. Linney, W. T. Knott, and others on 

 the Shaler and Procter Kentucky state surveys. The evidence which led to 

 such conclusions was tbe presence of the waste and outliers of the newer for- 

 mations far outside of their present continuous outer boundaries, and the ab- 

 sence of any materials in these formations which can be recognized as having 

 been derived from older formations exposed on the crest of a "Cincinnati anti- 

 clinal island." 



A resume of this evidence and a discussion of its bearings was given by the 

 writer in an article entitled "The hypothesis of a Cincinnati Silurian island," 

 published in the American Geologist, vol. xxii, 1898, pages 78-85. 



Citations giving Professor Shaler's views 1 are as follows : 



"The Carboniferous conglomerate . . . increases in thickness as we recede from 

 the Cincinnati axis. It contains a great quantity of pebbles, both in the east and in the 

 west, but not a trace has yet been found of any pebbles which could be attributed to the 

 Cincinnati axis." 



* Manuscript received by the Secretary of the Society December 31, 1908. 

 1 Report of Progress, Geological Survey of Kentucky, 1877, p. 17. 



