SfiCTIOK OF CRETACEOUS ROCKS 



585 



Animas 

 formation 



(Lithologic contrast. Unconformity not per- 

 ceptible.) peet In. 

 Sandstone, massive, tan-colored, micaceous 

 witli greenisli igneous del)ris, alternating 



with yellowish shale 50 



Shale, brown, drab, gray, and some reddish. 75 

 Sandstone, tan-colored, alternating with 

 heavy beds of brown, greenish, drab, and 

 yellowish shale, containing Ficus sp. ? and 

 Cornus sp. 109 feet from the top and 

 Artocarpus lessigiana (Lesq.) Kn. ; and 

 Xyssa ? racemosa ? Kn. 275 feet from the 



top 855 



Sandstone, greenish-gray, with small igne- 

 ous pebbles one-quarter inch in diameter 



in irregular zones 50 



Shale and sandstone, greenish, locally con- 

 glomeratic 250 



Shale, greenish 60 



Sandstone, greenish and pink, with pebbles 

 of schist and quartzite chiefly ; pebbles 



1 to 10 inches 20 



Shale, greenish 15 



Sandstone, greenish-gray, coarse, friable..,. 10 

 Shaie, greenish, and conglomeratic sandstone 20 



Shale, carbonaceous 1 



Bhale, drab 2 



Shale, carbonaceous 1 



Shale, greenish, with silicified wood 81 



Sandstone, gray and ferruginous, with sand- 



stoiie concretions 10 



Shale, dark red, bluish and drab 250 



Sandstone, argillaceous, with andesite and 



other igneous pebbles and tuffs 20 



Sandstone and shale with igneous matrix 



and pebbles 20 



Shale, greenish and purple 50 



Sandstone, j'ellowish 20 



Shale, greenish, purple and bluish 20 



Sandstone, massive, poorly consolidated, 

 yellowish-white, and cross-bedded ; contains 



Ficus planicostata Lesq. at the base 50 



Sandstone, argillaceous, and some shale; 



igneous matrix 85 



Tuff, coarse fragments of various composi- 

 tion 12 



Shale, reddish, alternating with dark con- 

 glomerate and sedimentary debris 28 



Tuff, reddish and pink, coarse-grained 7 



Feet In. 



