MUDDY CANON. 409 



the westward, the minor fold along the foot-hills, as already mentioned, 

 having disappeared. The dip gradually becomes steeper in ascending the 

 canon, reaching a maximum of 30°, and a thickness of nearly 6,000 feet 

 is exposed in the Wahsatch limestones. Near the entrance to the canon, 

 the beds are more or less siliceous and impure, and at one locality occm-s a 

 thin stratum of compact bluish sandstone, containing but little calcareous 

 matter. A thin section of this rock under the microscope reveals, in the 

 interstices between the rounded grains of quartz, minute crystals and frag- 

 ments of calcite. But few fossils were found along the section exposed in 

 this canon, and are mostly confined to fragments of corals, among which 

 were recognized ZapJirentis and Syringojoora. Underlying the Wahsatch 

 limestone occurs a considerable thickness of quartzose beds, associated with 

 some calcareous matter, which, from their position in the series, have been 

 referred to the Ogden Quartzite. These trend across the canon with a strike 

 of about north 10° to 15° west and a dip of 20° to 25° to the westward, 

 their lowest beds resting upon the western base of Ute Peak. 



Immediately underlying the Ogden Quartzite occurs the Ute limestone, 

 which includes here the entire series of calcareous and cherty beds exposed 

 on the abrupt walls of Ute Peak, which has furnishedthe name for this great 

 thickness of Silurian rocks, so characteristic of the lower portion of the 

 Palaeozoic section as developed in several widely-separated regions of the 

 Wahsatch Range. Ute Peak is situated between seven and eight miles above 

 the entrance to the caiion, on its south side, just below the junction of the 

 two forks ; its steep slopes forming the southern wall of the main caiion and 

 that of the south fork. It rises from 2,200 to 2,400 feet from the level of 

 'the stream, presenting, on its eastern side, a precipitous face, while to the 

 west its slopes fall away gently, more nearly in accord with the inclination 

 of the strata. The summit forms a broad, slightly-inclined table, the cul- 

 minating point being but little higher than the long ridge that rises above 

 the south fork. The beds of the Ute limestone cross the canon with an 

 observed strike of north 15° to 20° east and a westerly dip of 15° to 18°. 

 In the canon-bottom of the south fork, the stream-bed has cut through the 

 argillaceous slates and shales of the Cambrian series,, which extend up the 

 lower slopes of the peak from '60 to 50 feet, and are directly and conforma- 



