EASTERN UPLIFT. 407 



the lowest beds exposed were found the following' fossils, which correspond 

 closely with those obtained from Ogden Canon : 



Chonetes Loganensis. 



Khynchonella pustulosa. 



Euomphalus lotus var, laxus. 



Spirifer alba-pinensis. 



Spirifer centronatus. 



Proetus peroccidens. 



Proetus Loganensis. 

 At the forks of the canon, the beds rise more steeply, and a quartzite 

 belt is seen which may correspond to the Ogden Quartzite. In the north 

 fork of the canon, fragments of granite indicate the probable existence of a 

 granite core to this ridge beyond the limits of the map to the north. 



While numerous small streams and canons are found along the face of 

 the range toward Cache Valley, only two large streams to the south of Lo- 

 gan Canon, Blacksmith's Fork and Muddy Creek, cut entirely through the 

 ridge, coming from the still higher country of the Bear River Plateau. A 

 short distance to the south of Logan Canon the beds are found dipping into 

 the range at an angle of 20°. Still farther south, back of the town of 

 Providence, they seem to have a still lower dip. Ascending to the summit 

 of Logan Peak from the valley, in crossing the eastern dips, the strata are 

 seen to shallow out until they become perfectly horizontal ; while on the 

 summit the beds dip 12° to the westward. The strata thus crossed are dark 

 bluish-gray limestones, with many interstratified beds of calcareous grits, 

 cherts, and highly siliceous limestones, together with beds of dark compact 

 quartzite, always carrying some calcareous material. Occasionally, there 

 occur narrow beds of argillaceous sandstone. Near the summit of the peak, 

 in a dark-gray limestone, is a stratum of yellowish fine-grained sandstone, 

 which appears to be nearly free from any calcareous matter. Fragments 

 of corals too poor for specific determination were found on the slopes of the 

 ridge associated with a small Productus. From the summit of Logan Peak 

 were obtained at least two species of corals, ZapJirentis Stanshurpij and 

 Lithostrotion too poor for identification. To the eastward of Logan's Peak 

 the beds all appear to possess a decidedly westward dip. 



