PEQUOP RANGE. 511 



All the palseontological evidence obtained would go to show that only 

 the Lower Coal-Measures were represented. It is by no means improba- 

 ble, however, that a further search of the lower horizons may prove the 

 existence in the uplift of both the Sub-Carboniferous and Devonian members 

 of the Wahsatch limestone. 



From the summit of Spruce Mountain, the following forms were col- 

 lected : 



Produdus costatus, 



Productus semireticulatus, 

 Produdus Nehrascensis, 

 Eumetria pundulifera ; 



from the ridge north of Spruce Mountain, and from a number of other 

 localities, were obtained: 



Produdus Nehrascensis, 

 Fusilina cylindrica, 



crinoidal columns of large size, small disks of pentangular columns, together 

 with slender forms of an undetermined 



Trematopora; 



on the ridge near Blue Point Spring were found large numbers of 



Fusilina cylindrica. 



The Spruce Mountain diorites observed are usually small, irregular 

 bodies or narrow dikes. On the summit between the two prominent peaks 

 occurs one that may be considered typical. It is a fine-grained dark rock 

 with no large crystals, but made up of long, slender, black hornblendes, 

 with both monoclinic and tri clinic feldspars; the latter evidently predomi- 

 nating. The largest body of feldspar-porphyry is found on a saddle of 

 the ridge northwest from the high peak. It is an exceedingly compact, 

 tough rock, breaking with an angular fracture. In color, it is brownish- 

 gray, spotted with incrustations derived from iron minerals, which give it a 

 somewhat dirty appearance. Macroscopically, the only minerals that are 

 distinguishable are a few rounded grains of translucent quartz and frag- 

 ments of feldspar imbedded in a felsitic groundmass. Under the microscope,' 



