Indiana Geological SurveyBEDROCK_SURFACE_250K_IGS_IN.SHP is an Esri line shapefile providing a contoured depiction of the bedrock surface elevation of Indiana. Surface contours are represented by polylines (50 foot contour interval) each with a single value that provides estimated elevation of bedrock surface in feet.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/91587e332ea74aa38da25802a25440d5_1engIndianaMapPublicBedrock Surface Contours [Indiana]Web servicesIndianaLast Modified: 2025-09-24