422 N. H. DARTON PALEOZOIC AND MESOZOIC OF AV YOKING 



of the Casper formation in the vicinit}' of Laramie are illustrated in a 

 well exposed section in Gilmore canyon as follows : 



Section of Gasper and associated formations, 8 Miles Soutlicast of Laramie, 



Wyoming p^^^ 



Forelle limestone 20 ' 



Satauka red shale, some red sandstone 232 



Sandstone at top of Casper 2 



Red shale, with occasional thin beds of white and red 



sandstone 120 



Red to buff sandstone 65 



Limestone (fossiliferous) 8 



Upper "monument" sandstone 45 



Hard limestone, buff 2% 



Lower "monument" sandstone, red 78 



Massive, lumpy limestone 20 



Reddish soil (rocks concealed) 33 



Red sandstone 92 



Heavy bedded limestone, Spirifer cameratus 24 



Salmon-red sands and fine-grained sandstone 120 



Purple limestone 4 



Concealed (shale ?) 110 



Limestone, crinoid stems 5 



Concealed ( shale ?) 45 



Sandy purplish limestone 15 



Concealed (shale ?) 50 



Sandy, purple, thin slabby limestone 3 



Concealed (shale ?) 15 



Slabby, purplish, sandy limestone 15 



Massive, shelly, cross-bedded, purple, sandy limestone. ... 25 



Concealed, probably red shales and sandstones 90 



Purple, sandy, oolitic limestone 1 



Massive, red arkose and conglomerate (one-fourth inch 



pebbles) 20 



On granite. 



Total I,259y2 



This section exhibits 12 beds of limestone, from 1 to 26 feet thick, sepa- 

 rated by shale and sandstone. The lower sandstones are prevailingly 

 arkosic and occasionally conglomeratic. The limestones are usually crys- 

 talline, often sandy, and range from purple to white in color. The purple 

 limestones near the base of the formation are noticeable for many miles 

 along Laramie mountain, and usually they yield the lowest fossils. The 

 heav3^ bed of limestone in the loM'er middle portion is especiallj^ conspic- 

 uous in Cheyenne canj'on, 6 miles southeast of Laramie, where it lies on 



