428 N. H. DARTON PALEOZOIC AND MESOZOIC OF WYOMING 



Feet 



White limestone 10 



Concealed, debris slope 150 



Arkose conglomerate and red sandstone 24 



Shale 17 



Red flaggy sandstone 15 



Parti-colored shales 10 



Calcareous sandstone on schists 4 



Total 571% 



'4. 



On Lodgepole creek there is gradual increase in the proportion of lime- 

 stone in the Casper formation while the total thickness decreases to 500 

 feet or less. On Horse creek the basal beds are sandy limestones and 

 near the middle of the section is a 30-foot bed of reddish brown sand- 

 stone. The main body of limestone is overlain by a 40-foot bed of red- 

 dish brown, soft sandstone, and then follows a succession of 5 feet of mas- 

 sive, white, hard limestone and 20 feet of very pale red sandstone. The 

 latter is succeeded by red shales and sandstones of the lower part of the 

 Chugwater formation. The Casper formation in this region is shown in 

 plate 25. 



The following section was measured for me by Dr W. S. Tangier 

 Smith : 



Section of Gasper Formation at Iron Mountain Station, Wyoming 



Feet 



Limestone 5 



Reddish sandstone 15 



Limestone 40 



Red sandstone 25 



Massive limestone 135 



Reddish quartzitic sandstone 12 



Massive gray limestone 40 



Quartzitic red sandstone and conglomerate 25 



Compact limestone 25 



Red coarse-grained sandstone and medium coarse conglom- 

 erate 25 



Conglomerate, quartzitic, light colored 10 



Granite. 



Total 357 



Fossils. — The Casper formation has yielded but few fossils. In the 

 24-foot bed of limestone in Gilmore canyon, 8 miles southeast of Laramie, 

 a single Spirifer cameratus was found. The 8-foot bed of limestone 270 

 feet above yielded the following species, determined by Dr G. H. Girty: 



