BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 5, 1893, pp. 465-480, PL. 18 APRIL 18, 1894 



GEOLOGY OF A PORTION OF THE COOSA VALLEY IN 

 GEORGIA AND ALABAMA ^-i^ 



BY CHARLES WILLARD HAYES 



(Read before the Society December 28, 1893') 



CONTENTS 



Page 



Introduction 465 



Ph y&;iograi)b y of the Region 466 



Stratigraphy of the Region 466 



Cambrian Rocks 466 



Silurian Rocks 469 



Devonian Rocks 470 



Unconsolidated Formations 470 



Overlaps 471 



Geologic Structure of the Region 472 



Folds 473 



Minor Thrust-faults 473 



Major Thrust-faults 475 



Relation of minor and major Thiusts 476 



Amount of horizontal Displacement 477 



Paleozoic History of the Region 478 



Post-Paleozoic History of the Rei^ion 479 



Introduction. 



The region discussed in the following paper embraces portions of the 

 Rome and Fort Payne atlas sheets of the United States Geological Sur- 

 vey in Georgia and Alabama. The outlines of its geology have already 

 been presented to this Society in a paper read at the Washington meet- 

 ino- in 1890. While the main features of its structure were known at 

 that time the details had not yet been worked out. Further study of 

 this region during the past summer has cleared up much of the obscurity 

 heretofore surrounding its geologic history, and it is believed the results 

 obtained are of sufficient importance to warrant bringing the subject 



* Published by pcrmissioa of the Director of the U. S. Geological Survey. 

 LXV-Bur.T,. Geol. Soc. Am., Vol. 5, 1893. (465) 



