LOCALITIES WHERE THE GROUPS CAN BE STUDIED. 47 



posed by passing back and forth among- the^hills until reaching' a point about 

 a mile and a half west of Blair's coal mine, you come to a high ridge or 

 hogback where the series ends. This hogback is composed of the upper 

 sandstone of the Point of Rocks Group; the junction of the two groups on 

 this line can be very well seen. The gray sandstone of the Point of Rocks 

 Group is massive and indurated. The brown, ferruginous . shales of the 

 Bitter Creek Group yield readily to atmospheric degradation, and have been 

 swept away back of the ridge or hogback, leaving broad, naked surfaces of 

 gray sandstone. 



Another fine section can be obtained by commencing on the southern 

 face of the Quien Hornet Mountain and passing over the escarped ledges 

 in a southwesterly direction along the bluffs of Red Creek until you reach 

 the foot of the great hogback which is composed of beds of the Point of 

 Rocks Group. 



Vermilion Creek in its upper course runs through beds of this group. 

 Its many wet-weather tributaries have carved the country with deep but 

 flaring channels, and the naked beds can be seen on every hand; and the 

 bad-land hills are filled with fossils; but the lower members of the group 

 cannot well be studied by reason of some complicated but interesting dis- 

 placements that are observed a little north of the Vermilion Cafion. These 

 displacements will be discussed hereafter. 



To the southward this group of rocks is developed over broad areas. 

 The Cafion of Desolation for much of its course is cut through these rocks, 

 and in its high walls this group can be studied to advantage. The Pink 

 Cliffs of Southern Utah are of this age. 



POINT OF ROCKS GROUP. 



A good section of this group can be obtained at Point of Rocks Station. 

 There is a series of cliffs and abruptly escarped hills extending from a point 

 northeast of the station in a westerly direction for several miles. These 

 escarpments face Bitter Creek and the Union Pacific Railroad. In the cliff 

 immediately back of the depot at Point of Rocks the junction between the 

 Bitter Creek and Point of Rocks Groups is well seen. As I have already 

 described, the lower members of the upper groups are brown, friable, arena- 



