626 W. T. LEE STRATIGRAPHY OF COAL FIELDS OF NEW MEXICO 



faulting has occurred in a way that renders the relation of the Mesaverde 

 to the Tertiary open to question; but near the northern end of the Eio 

 Puerco field an exposure was found of rocks undisturbed by faulting 

 where the basal conglomerate of the Tertiary with pebbles of quartzite 

 up to 6 inches in diameter rests on the Mesaverde. 



Section of Mesaverde Rocks measured near San Ygnacio, Neio Mexico 



Feet Inches 

 Sandstone, locally conglomeratic, and shale (Tertiary) poorly 

 consolidated, vari-colored, with reds predominating below and 



milder shades above (many hundreds of feet) 



Probable unconformity 



Shale with thin beds of coal ; absent in some places 0-10 



Sandstone, massive, yellow, calcareous, and shaly in some places ; 

 contains Ostrea sp., Anomia sp., Inoceramus sp. (thick-shelled) ; 

 Cucullcea sp. ; Cardium sp. (large form) ; Gardium sp. (slender 

 form) ; Tellina sp. ; Cyprimeria sp. ; Liopistha undata M. & H.?; 

 Corl)ula sp. ; Mactra sp., related to M. formosa M. & H. ; Mactra 

 sp. (large form) ; Dentalinm sp. : Gyrodes sp. ; Pfiysa ? sp. ; Volu- 

 tomorpha novimexicana Herrick & Johnson ; Pyropsis sp. ; Ac- 

 tceon ? sp. ; Scapnites sp., related to S. nodosus Owen ; Placen- 

 ticeras sancarlosense Hyatt?; Placenticeras planum Hyatt? (U. 



S. G. S. locality No. 7189) 300± 



Shale, sandy, containing BracliypTiyllmii ? sp. ; Ficus n. sp. (3- 

 nerved type) ; Salix ? sp. ; Ficus ? sp. (large leaf) (U. S. G. S. 



locality No. 6034) 9 



Shale, carbonaceous 11 



Coal 1 1 



Shale, carbonaceous 7 



Sandstone 8 



Shale, carbonaceous 2 6 



Coal 7 



Shale, carbonaceous 3 6 



Sandstone 3 



Coal 1 



Shale, carbonaceous 7 



Coal 6 



Shale, carbonaceous 10 



Coal 2 



Shale, carbonaceous 2 6 



Sandstone 1 



Shale 6 



Coal 5 



Shale, carbonaceous 3 6 



Coal 2 



Shale, sandy 2 6 



Coal 1 



Shale, sandy 6 



