Publication Information: Key Details: Catalog B075 Publication Year 1950 Author Illinois State Geological Survey Publication Type Bulletins Additional Details: Publication Link Bulletin 75 Plate 1 (3 MB pdf) Bedrock surface in the Peoria region Plate 2 (5 MB pdf) Areal geology of the Peoria region Plate 3 (600 K pdf) Cross-section of glacial deposits in the Peoria region Plate 4 (1 MB pdf) Locations of observation wells Publication Price Buy