STUDY OF A LINE OF DISPLACEMENT IN THE GRAND 

 CANON OF THE COLORADO, IN NORTHERN ARIZONA. 



BY CHARLES D. WALCOTT, OF THE U. S. GEOLOGICAL SURVEY. 

 Read before the Society, August 29, 1889. 



CONTENTS. Page 



Introduction 49 



The Fault and the Periods of Faulting 51 



Description of the Butte Fault 51 



The Pre-Cambrian Movement 56 



The Tertiary Movement 57 



The Flexing of Strata on the line of the Fault 57 



The Butte Fault and the Grand Canon 60 



Analogy between the Hurricane Fault and the Butte Fault 62 



Paleozoic Movement 63 



Kesume 64 



Introduction. 



During the summer and fall of 1882 I was engaged in studying the 

 Paleozoic rocks of southern Utah and northern Arizona, north of the Grand 

 Canon of the Colorado river, and iu the winter of 1882-83 in a detailed 

 study of the geology of a portion of the Grand Canon. The area under 

 investigation in the Canon included its head, at the foot of Marble canon, 

 and the Grand Canon with its lateral canon valleys on the west, from Nun- 

 ko-weap valley outlet to the westward turn of the canon, where it cuts 

 through the Kaibab plateau aud exposes the Archean rocks in the depths 

 of the inner canon. A partial account of the notable sections of Algonkian 

 and Paleozoic strata has been published,* but nothing has yet appeared re- 

 lating to a line of displacement whose early history was mainly determined 

 by the study of the stratigraphy within the canon. To-day I wish to describe 

 this displacement and also to call your attention to certain conclusions drawn 

 from the consideration of the phenomena presented by it. 



- *Am. Jour. Sci.,3d ser., vol. 26, 1883, pp. 437, 442, 484. Bull. U. S. Geol. Survey, No. 30, 1886, In- 

 troduction. 



VII— Bull. Geol. Soc. Am., Vol. 1, 1889. 



(49) 



