GLENROCK    COAL   FIELD,    WYOMING.  159 
Ft.  in. 
Shale,  gray 2 
Coal 3 
Fire  clay 6 
Shale,  sandy 1  7 
Sandstone,  soft 21 
Shale,  gray 9  2 
Shale,  brown 8 
Shale,  black 9 
Shale,  gray 9 
Shale,  brown 4 
Shale,  black 8 
Shale,  sandy 2 
Sandstone,  soft 18 
Sandstone,  hard 1  2 
Shale,  sandy 14  5 
Shale  and  trace  of  coal 1  4 
Shale,  gray 9 
Sandstone,  hard 3 
Shale,  gray 9  3 
Iron  rock 1  8 
Shale,  sandy 6  2 
Sandstone,  soft 10  10 
Sandstone,  hard 1 
Sandstone,  soft 18  5 
Shale,  brown 1 
Coal 7  6 
Fire  clay 6 
Soapstone 10  4 
Shale,  gray 1  6 
Coal 2  2 
Fire  clay 4 
Sandstone,  soft 52  8 
Sandstone,  hard 1  6 
Sandstone,  soft 12 
Sandstone,  hard 1  6 
Sandstone,  soft 34 
Shale,  sandy 5 
Sandstone,  soft 21  4 
Sandstone,  hard 1  4 
Sandstone,  soft 68  4 
Coal 1  li 
Fire  clay 6 
Slate,  black 4  10 
Coal 8 
Fire  clay 4 
Slate,  black 1  8 
Slate,  gray 3 
Slate,  black 6 
Slate,  gray 2 
Shale,  black 7 
Sandstone,  hard 1 
Soapstone,  gray 2  6 
Shale,  gray 5  7 
Coal 5 
