SILURIAN REEF POINTS --
Silurian Reefs, 1992 (1:500,000)
Shows Silurian reefs, which are geologically significant in the exploration
for and development of oil and gas fields and industrial minerals.
Digitized and modified from the following published map: Indiana Geological
Survey Miscellaneous Map 54.
This shapefile can be used in conjunction with SILURIAN_REEF_POLYGONS_MM54_IN.
FGDC metadata: SILURIAN_REEF_POINTS_MM54_IN