ENDLicH] GEOLOGICAL FORMATIONS OF COLORADO. 



Synopsis of the geological formations found in Colorado. 



123 



Locality. 



Oo 



White Eiver 



Fossils. 



Character of strata. 



Leaves on divide be- 

 tween White aud 

 Grand. (See Dr. 

 Peale's Report fol- 

 lowing.) 



Massive, dark brown sand- 

 stones. Slight interstrata 

 of dark shales. Sandstones 

 weather in very grotesque 

 groups. 



White Eiver. 



Extensive shale-series. Fear 

 thebottom some sandstones 

 occur. Throughout the re- 

 mainder of the group the 

 strata are composed of 

 thinly laminated, white, 

 gray," and yellow shales. 

 Some of the strata are 

 much harder than others 

 and form prominent ledges. 

 The group continues south- 

 ward across Grand River, 

 andis therefore not quoted 

 from that locality. 



Rio San Juan region. 



Animas K'.ver . 



White River and Grand 



Mesa Verde . 



Animas River 



Grand River. 



Leaves and indis- 

 tinct remains of 

 plants. A few ver- 

 tebrate remains 

 on Plateau Creek. 



Heavy beds of yellow and 

 brownish sandstones near 

 base. Alternating sand- 

 stones and arenaceous 

 shales higher up and to 

 top. 



Massive beds of yellow 

 sandstones. Interstrati- 

 fled with shales and con- 

 taining some coal through- 

 out. 



Massive yellow sandstones 

 below. Shales, grav and 

 brown higher up. Yellow 

 and pink sandstones near 

 middle. White and yel- 

 low sandstones and shales 

 near top. Coal near top. 



Variegated shales and marls. 

 Pink, red, maroon, yellow, 

 greenish, grav. Inter- 

 strata of sandstones and 

 dolomites. 



Variegated shales and marls. 

 Same colors as above. 

 Thin beds of sandstone 

 throughout. Capped by 

 heavy sandstone. 



Variegated shales and marls. 

 The entire series is charac- 

 teristic illy a "bad land" 

 formation. 



1100 



1200 



to 



140O 



1000 

 to 

 1200 



1300 



600 

 to 

 850 



1000 



to 



1200 



800 



