EXDLicn.] GEOLOGICAL FORMATIONS OF COLORADO. 



Synopsis of the geological formations found in Colorado — Continued. 



129 



© 



73 



D 

 O 



£l 



O 

 PP 

 Ph 



to 



S 



o 



i 



o 



p 





Locality. 



Fossils. 



Character of strata. 



s 



to 

 o to 



§.9 



1 



Head of Salt Creek 





Pink and red sandstones and 

 shales with gypsum. 



Pink, couglom'eritic sand- 

 stones, and red shales. 



Red sandstones with inter- 

 strata of shales. 



Red sandstones, partly con- 

 glomeritic. 



Red, pink, and maroon sand- 

 stones with thin beds of 

 limestone. 



Red sandstones and shales 

 with bands of limestone. 



1700 



1000 



1400 



1800 



2000 



to 



2500 



2200 









Athyris subtilita, 

 Productus. 





Park range 







Sigillaria, Calamites, 

 ProductuxjSpirifer, 

 Athyris. 





is 



n 



-1l 



Sangre de Cristo Rauge. 

 Arkansas Eiver 



Crino'ids, Productus, 

 Spirifer, Orthis. 



Crino'ids, corals. 



Red sandstones with inter- 

 strata of shales and bands 

 of limestone. 



Massive red sandatones with 

 limestones. 



2400 

 4000 



Average thickne&t 







2000 







to 



o 



M 



:?; 



o 



a 



<i 

 O 



m 

 ►J 



Q 



o 





Head of Salt Creek 





Sandstones, shales, and prob- 

 ably limestones. 



Yellow and gray sandstones 

 and shales. 



Occurring in limestones be- 

 longing to top of sandstone 

 and shale series. 



Variegated sandstones and 

 shales, with limestones 

 near base. 



Yellow, gray, and reddish 

 sandstones and shales with 

 limestones. 



Greenish and gray sand- 

 stones and shales. Lime- 

 stones. 



Yellow and gray sandstones 

 and shales. 



Gray and brown sandstones 

 and shales. Limestones. 



3500 

 1200 

 1300 



2500 



1300 



to 



2000 



2000 



640 

 800 



Animas near Cascade 



Creek. 

 Animas near Junction 



Creek. 



Eagle Eiver 



Indistinct plants 



Productus semistria- 

 tus, Athyris subti- 

 lita, Spirifer. 



Avicula, Aviculopec- 

 ten, Pleurophorus. 



Productus, Athyris, 

 Rhynchonella, 

 Heraipronites, Ret- 

 zia. 



Productus, Athyris, 

 Spirifer. 



Elk Mountains 



Park Range 



Grand River 



Badger Creek 



Orthis, Productus, 

 Orthoccras. 





Average thickness 



of strata 





1700 







o 



i 



o 



B3 



a 

 o 



6 



1 



s 



!. 

 B 



1 



Head of Salt Creek.... 

 Near Animas Eiver . . . 

 Eagle River 



Productus, Crino'ids, 



Corals. 

 Prod,uctus, Spirifer, 



Crino'ids. 



Shaly sandstones and blue 



limestones. 

 Massive blue limestones 



300 



400 



500 

 600 



300 

 to 

 400 

 114 



Elk Mountains 





Limestones and calcareous 

 shales. 



Blue limestones are pre- 

 dominating. Arenaceous 

 shales. 



Cherty blue and gray lime- 

 stones. 



Park Range 





Pleasant Park 



Terehratula, Spirife- 

 rina. 



Average thickness 



of strata 





380 



















9 a 



