130 



REPOET UNITED STATES GEOLOGICAL SURVEY. 



Synopsis of the geological formations found in Colorado — Continued. 



Locality. 



Lime Creek 



South of Mount Oso . . . 



rossils. 



IRhynchonclla. Spiri- 

 fer, Crinoids. 



Productun subacu- 

 leatus, Orthoceras, 

 Athyris, BeiUro- 

 phon, Euompha- 

 lus, Rhynchonella 

 Endlichi. 



Character of strata. 



Massive bUie limestones. 



Massive bine limcstonea, 

 ■with sandstones and shales 

 near top. 



o o 

 a) c3 



1200 



to 

 1500 



400 



Eagle Kivor. 



Eagle River , 



Four-mile Creek 



North of Mount Onray 



North of Arkansas 



River. 

 Trout Creek 



Along the border of 

 Front Range, be- 

 tween Colorado 

 Springs and canon. 



Gleu Eyrie 



Williams' C.'iiion 



Orthis d^smopleura 

 Eunmphalus. 



Heterocrinus, Ortho- 

 ceras. 



Linpulepis, Oholus, 

 Orthis desmopleu- 

 ra, Euomphalus. 



Biicanella nana 



Ophileta complanata. 



Light blue limestones, most- 

 ly magnesian. 



Quartzites, sandstones, and 

 blue limestones. 



Blue and gray limestones, 

 partly magnesian. 



Light gray and blue lime- 

 stones. 



Dark gray quartzitic lime- 

 stones. 



Red calcareous sandstones 

 and pink limestones. 



Hard gray limestones, quarts- 

 itic in part. 



Red shaly limestone 



Reddish arenaceous lime- 

 stones. 



Aver.age thickness of strata 



Lime Creek . 

 Eagle River. 



Four-mile Creek. 



Trout Creek 



North of Mount Onray. 

 Near Canyon City 



Glen Eyrie. 



"White sandstone and quartz- 



ite. 

 White quartzites 



Red and pink sandstones and 



quartzites. 

 Tellow and pink sandstones 

 White and pink quartzites . 

 Variegated inic.acoous and 



calcareous sandstones 

 Red sandstonts and quaftz 



ites. 



Averag'i thickness of strata 



220 



200 



200 



200 



150 



100 

 to 

 150 

 180 



160 



300 

 to 



400 

 100 



80 

 200 



180 



