584 REPORT UNITED STATES GEOLOGICAL SURVEY. 



ridge that rises from the edge of the lake. In the latter the dip is to 

 the westward, and the folio wing beds were noted as forming the section : 



Section Xo. 27. 



1. Red sandstones. 



2. Red and white quartzitic sandstones. 



3. Pink quartzitic sandstones.' 



The last bed forms the western slope of the ridge that rises from the 

 lake shore. The red sandstones of layer No. 1 are probably the same 

 as those at the base of the section at Station 100, yet to be given, 

 although it is possible that they are just below them, as the strike pro- 

 longed to the northward would fall a little east of Station 100. The 

 ridges on the lake north of the station appear to curve somewhat, and 

 probably show a swerving in the strike. 



The finding of Jurassic fossils in beds dipping to the eastward indi- 

 cates a possibdity of an anticlinal fold west of Station 108. Looking 

 north from the station, a fold is seen in the bluff on the north side of 

 North Eden Creek. This fold is very distinctly shown in beds that lie 

 below the red sandstones. This is probably the same fold through 

 which the Bear flows east of Station 100, and across which a section 

 has been made. At that point the western side of the anticlinal dips 

 comparatively gently. Here, however, the western dip is steep, and at 

 Station 100, also, the dip is rather steep, reaching 60°. As we go down, 

 however, it decreases. If it is another fold, it must begin south of the 

 Bear. North of North Eden Creek the Wahsatch beds rest uncomform- 

 ably on the Jurassic and Triassic rocks for some distance north. They 

 appear to be almost horizontal, and to have been deposited on the eroded 

 surfaces of the upturned older rocks. 



South of Bear Lake the Wahsatch beds have been removed, exposing 

 the underlying Palaeozoic rocks. On Station 1 10, east of Spring Creek, 

 Mr. Mushbach obtained the following fossils : 



Spirifer Pochymontanus. 

 Athyris subtilita. 



Productus ? 



Zaphrentis ? 



Crinoidal fragments. 



The limestones from which these were obtained dip to the eastward 

 and represent the eastern portion of the anticlinal that lies west of Sta- 

 tion 108, the overlying Bed Beds of Jurassic limestones being eroded 

 away. A short distance north of Station 110 the Wahsatch beds rest 

 on these limestones, coming to the edge of the hill overlooking the south 

 end of the lake. Station 109 is about three miles west of 110, and is on 

 quartzites, whether of Carboniferous or Silurian age I am unable to say, 

 no fossils having been obtained from them or nearer to them than Sta- 

 tion 110. 



Returning to the northern portion of the plateau, we find it limited 

 by the canon of Bear River, which crosses with a most eccentric course, 

 best shown on the accompanying map. 



The following is the section from Station 100 west to the ridge that 

 slopes to the edge of the lake : 



Section No. 28, west from Station 100. 

 Base. Thickness in feet. 



1. Red sandstones ? 



2. Red sandstones, somewhat lighter in color than No. 1 : ? 200 



3. White quartzites 



