524 DEScmPTivE geology. 



the head of the south branch of Forellen Creek, thicknesses of several 

 thousand feet of limestones are found, generally dark bluish-g-ray, heavily 

 bedded, and having a gentle dip of 20° to 25° to the eastward. No fossils were 

 obtained, however, from these beds;" but their general character is that of the 

 Wahsatch limestone. In the neighborhood of the mouth, or western end, ' 

 of Emigrant Canon, the beds stand at a steeper angle, dipping in some 

 cases 45° to the eastward, and have evidently been faulted, one line of fault 

 being observed in a little side-ravine on the south side of the canon, about 

 a mile from its mouth, where the ujjthrow has been on the eastern side of 

 the fault, and some of the eastern beds have been sharply bent doM^nward at 

 the line of fault. The line of this fault appears to be to the northeast. A 

 short distance above this jDoint a section is exposed of several hundred feet 

 of shaly beds, from which issues a considerable body of hot water. The 

 beds shown here from the line of fault upward consist of 300 feet of light- 

 gray limestone, overlaid by 100 feet of yellowish calcareous shales, above 

 which are 150 feet of black, thinly-laminated, calcareous shales, abound 

 ing in fossils ; above the shaly beds are 200 feet of dark-gray limestones, 

 followed by heavy beds of limestone about 1,500 feet thick, which could not 

 be definitely determined on account of surface-accumulations. From the 

 bed of black shales were obtained the following fossils, which have been con- 

 sidered to represent the Upper Helderberg group : 



Ortliis muUistriata. 

 OrtJiis, n. sp. 

 Spirifer Vanuxemi. 

 Atrypa reticularis. 

 Cryptonella, frag. 

 Crania, undet. sp. 



The slopes of the caiion above the Hot Springs are in general too 

 much covered by detritus to afford a continuous section. Only a general 

 idea of the rocks can be obtained here, from which it is seen that at least 

 4,000 or 5,000 feet of limy beds are cut, which, toward the upper part, show 

 a greater proportion of shales, and are generally of much lighter color. Near 



