128 



REPORT UNITED STATES GEOLOGICAL SURVEY. 



Synopsis of tlie geological formations found in Colorado — ContiDued. 



Locality. 



Fossils. 



Big Thompson 



Saint Train's Creek . 



Dr. Hayden, Report 

 1869, p. 119, fMiDfl 

 on Box Eltltr 

 Creek, north of 

 Big Thompson, a 

 species of Ostrea 

 and Pentacrinus 

 asteriscus. 



Cliaracter of strata. 



Reddish - grey sandstone 

 below, thin' beds of lime- 

 stone and variegated clays 

 higher up. 



Red sbalv sandstones near 

 base, alternating beds of 

 soft sandstonen and shales, 

 with limestones near top. 



Average thickness of strata. 



Una weep Canon. 



Rio Dolores 

 Eagle River 



Near Greenhorn Mts. 



Near Canyon City. 



South Platte River 



Pleasant Park . 



Glen Evrie 



Garden of the Gods 



South of Golden. 



Near Golden 



Little Thompson 



Massive red sandstones and 

 shales. 



Red sandstones and shales. 



Red, massive sandstones, 

 with some white near 

 base. Ligbtercolored and 

 shaly toward top. 



Heavy'sandstones. becoming 

 shaiy toward ths middle, 

 changing with white sand- 

 stones near top. 



Massive red sandstones with 

 white and red sandstones 

 and shales near top. 



White and redmottleil sand- 

 stones, red and white, with 

 red bands near top. 



White and red sandstones 

 near base. Massive red 

 near top. 



Massive red sandstones, 

 pink and white higher 



Red and white sandstones, 

 with brilliant red shales. 



Red massive pan r" stones, 

 with shales. White and 

 pink near top. 



Here the group has shrunk 

 considerably. Mainly red 

 sandstone. 



Soft, red sandstones below. 

 Above them 250 to 300 feet, 

 shaly sandstones, capped 

 by about 250 feet massive 

 red sandstones. 



Average thickness of strata 1200 



Eagle River . 



Oalamites Suckovii, 

 atigmaria facoides, 

 Calamites gigas. 



SandstOTes and sha'es with 

 limestmes toward tie top. 



SS 



Eagle River . 



Indistinct remains 

 of plants. 



Extensive series of sand- 

 stones, shales, and lime- 

 stones. 



