Coal fields and outlines of coal-bearing strata in the Colorado Plateau coal assessment study area (cpcf*g)

These are shapefiles and ARC/INFO coverages of coal fields
and coal-bearing formations in the Colorado Plateau. These
GIS layers were created by combining numerous ARC/INFO
coverages created for the Colorado Plateau coal assessment.
The coal field outlines are approximate boundaries based on
criteria provided below under Data Quality Information,
Process Steps. These coal field outlines may not overlap
exactly with other published coal field boundaries or with
criteria used in the geochemistry data. We used existing
polygons taken from numerous digital geologic maps, as
described in Process Steps, but did not use overburden
cutoffs.