OCCURRENCE OF COAL. 35 
Section of coal-bearing rocks near Carbonera — Continued. 
Ft. in. 
Shale, drab 5 
Coal 3 4 
Shale, carbonaceous 2 
Sandstone, buff 10 
Coal 3 10 
Shale, carbonaceous 3 
Sandstone, buff 
Coal and bone 2 
Sandstone, thin bedded, buff, and shale 35 
Sandstone, buff 5 
Sandstone, buff, thin bedded, and shale 20 
Cool 2 
Shale, carbonaceous 2 
Shale, drab, sandy 10 
Sandstone, buff .""> 
Shale, carbonaceous . 15 
Sandstone, buff 2 
Shale, drab :'. 
Sandstone, buff 7 
Shale, carbonaceous 18 
Sandstone, buff 7 
Shale, drab :) 
Sandstone, buff 10 
Shale, carbonaceous 2 
Sandstone, buff . 25 
Shale, carbonaceous 3 
Sandstone, shaly 5 
Shale, carbonaceous 5 
Sandstone, buff 10 
Shale, drab 15 
Sandstone, shaly 10 
Coal 6 
Shale, carbonaceous 2 
Sandstone, shaly 20 
Shale, carbonaceous :! 
Coal : 10 
Shale, carbonaceous 1 
Coal K> 
Shale, carbonaceous 1 
Sandstone, buff, shaly 2 
Shale, carbonaceous 1 
Coal -1 
Shale, carbonaceous 5 
Sandstone, buff 65 
Shale, drab, including several thin beds of buff sandstone 70 
Sandstone, massive, buff i>" 
Shale. Mancos. 
585 l 
Within a distance of less than 500 feet above the top of the Mancos 
shale there are five beds of coal, each 2 feet or more thick, and several 
other thinner carbonaceous layers. At the Carbonera mine the coal 
bed measures more than 7 feet, but it is parted by two layers of l><>n<-. 
