TERTIARY LACUSTRINE SERIES. 159 



the following members of the Bitter Creek, which are much the same in all 

 exposures : 



SOUTHERN BITTER CREEK. Feet 



1. Upper white limestone and calcareous marl (summit of series) 300 



2. Pink calcareous sandstone .. 800 



3. Pink conglomerate (base of the series) 5D0 



1,000 

 In the northern part of the district we have a larger development of 

 the Bitter Creek series, and resting upon it some heavy masses of the Lower 

 Green River shales, and probably a considerable portion of the Upper Green 

 River Group is also represented. There is, however, no exact correspond- 

 ence in the lithological or stratigraphical succession of the component mem- 

 bers of the Bitter Creek when the northern and southern portions of the 

 district are compared. A series of sections from the northern part is given 

 in the following chapter. 



The Pink Cliffs, which form such a striking feature in the scenery of 

 the southern terraces, are exposures of the fine-grained calcareous sand- 

 stone forming* the middle member of the Bitter Creek. The same expos- 

 ures are exhibited in the southern and southwestern flanks of the Marka- 

 gunt around the entire promontory of the Paunsagunt and in the circuit 

 of the Table Cliff. In the Aquarius Plateau the Lower Eocene is found, 

 but in smaller volume than elsewhere, and it is decidedly diminished in 

 mass upon the summit of Thousand Lake Mountain. But it resumes 

 its normal thickness farther north, and then grows more and more massive 

 throughout the extent of the Wasatch Plateau. 



In their general characteristics these Tertiary strata are similar to the 

 Laramie beds upon which they generally rest, being shaly and marly and 

 sometimes lignitic. It :*s noteworthy, however, that in the southern part of 

 the district of the Hicrh Plateaus no lignite or carbonaceous material has 

 yet been discovered in the Tertiary beds. But in the northern part of the 

 district the lignites are found abundantly not onl}~ in the Lower Eocene 

 (Bitter Creek), but even in the Lower and Upper Green River (?) beds. 

 In the San Pete Valley coal has been mined for local use for several years, 

 and taken from what appear to be seams of Green River age. A more 

 detailed description of the Northern Tertiaries will be given in the next 

 chapter. 



