SILURIAN REEF POLYGONS --
Silurian Reef Areas, 1992 (1:500,000)
Shows the general locations of Silurian reef bank formations, including two
major reef bank areas known as the "Fort Wayne bank area" and the "Terre Haute
Digitized and modified from the following published map: Indiana Geological
Survey Miscellaneous Map 54.
This shapefile can be used in conjunction with SILURIAN_REEF_POINTS_MM54_IN.
FGDC metadata: SILURIAN_REEF_POLYGONS_MM54_IN