244 GEOLOGY AND MINING INDUSTKY OF LEADVILLE. 



Moraines. — The depth of Wash, where it could be obtained, affords data 

 for locating the limits of the south branch of the Evans glacier. These 

 nearly coincide with the bed of Stray Horse gulch, which has been eroded 

 along the contact of its moraine with the rock surface to the south. South 

 of this line there is practicall}' no Wash, while the line of shafts just north 

 of it show the following depths of moraine material: Leavenworth (P-4), 

 207 feet; Rothschild (P-9), 260 feet; Clara Dell, 126 feet; Woodruff, 148 

 feet; Logan, 100 feet; Silver Basin (P-33), 231 feet; Indiana (P-53), 180 

 feet; Raven, 200 feet; Right Angle (P-69), 200 feet; Hunkidori (in the 

 gulch), 35 feet; Denver Cit}' shafts, 180 feet. 



AREA BETWEEN MIKE AND IRON-DOME FAULTS. 



The area west of the Mike fault is divided into three faulted blocks by 

 the displacement of the Iron-Dome and Carbonate faults. North of the 

 line of Stray Horse gulch these faults merge into folds, and the structure is 

 that of a series of anticlines and synclines, of which the Yankee Hill anti- 

 cline and syncline have just been described. In what follows, the areas 

 included between the two faults will be first taken up ; then the Little Stray 

 Horse Park syncline and Fryer Hill double anticline ; after that the Pros- 

 pect Mountain region north of Evans gulch, in which the folds are merged 

 into one broad anticlinal and synclinal fold, and finally the as yet unknown 

 mesa region under Leadville itself. 



Iron-Dome fault. — The Iron fault has been actually cut by underground 

 workings and its plane explored to a greater extent than any other in the 

 region, so that the line of its intersection with the rock surface is the most 

 accurately determined, and perhaps for this ver}^ reason the most irregular. 

 This irregularity has no doubt been exaggerated by the effect of erosion, 

 and if the intersection of the fault plane with the rock surface were in a 

 horizontal plane it would show less abrupt curves, but still present a marked 

 contrast to the lines usually employed to represent fault outcrops. 



At its north end, on the west slope of Yankee Hill, as already shown, 

 it merges into an anticlinal fold. Its plane is first cut at the end of the 

 Chieftain (P-43) tunnel, which runs 360 feet in an average direction S. 

 55° E. through Blue Limestone and vein material, much compressed and 



