DENSITY OF CAVE ENTRANCES --
Cave Entrances per Square Kilometer, 1997 (Source scale is unknown)
Shows the density (i.e., number of entrances per square kilometer) of mapped
cave entrances in Silurian, Devonian, and Mississippian rocks in southern Indiana.
Locations of individual cave entrances are not shown.
The layer was compiled using unpublished data provided by personnel of the Indiana
Geological Survey. This layer was used in the creation of the following published
maps: Indiana Geological Survey Miscellaneous Maps 64 and 65.
FGDC metadata: KARST_CAVE_DENSITY_IN