Area Map

Photographs

                  Wyodak-Anderson coal, which is more than 100ft. thick, in the Eagle 

                  Butte coal mine, in the Gillette coalfield in Wyoming.  A Coal train is 

                  on the horizon in background.

                 The split Wyodak-Anderson coal zone (upper bed is Anderson or Dietz 

                 1 coal and the lower bed is Dietz 2 coal) in the Decker mine in Montana.  

                 The coal beds are split by tabular crevasse splay sandstone interbeded 

                  with mudstone and siltstone.

             Coal beds of the Wyodak-Anderson coal zone and overlying carbonaceous 

             shale, mudstone, siltstone, and sandstone in the highwall of the Big Horn 

             mine.

Wyodak-Anderson coal zone.

Fluvial channel sandstone above the Wyodak-Anderson coal zone.

                Floodplain mudstone, siltstone, and silty sandstone underlain by fluvial 

                channel sandstone beds (lower part of photo).  The floodplain deposits 

                have undergone pedogenesis that transformed the deposits into a stack 

                of paleosols.  Each paleosol consists of carbonaceous mudstone deposits 

                with roots in the upper part and ironstone deposits in the lower part.  

                These deposits underlie the "Sussex" coal zone and exposed north of 

                Linch, Wyoming.

                 Vertically stacked fluvial channel sandstone deposits interbedded with 

                  floodplain and crevasse splay deposits.  These deposits are below the 

                 "Sussex" coal zone, which is exposed north of Linch, Wyoming.

To order this CD, contact Christa Lopez.  

Email: clopez@usgs.gov

Regional Coordinator: Romeo Flores  

Email:  rflores@usgs.gov