Knowledge Bank

Near Shenandoah, in Richland County, is a geologic section that exposes ten different till units with some intercalated sand and gravel, and some evidence of weathering. The three uppermost tills correlate with the Hayesville, Navarre, and Millbrook Tills of the Killbuck Lobe, which are of Wisconsin age. The remaining seven till units occur below the oldest-named till in the Killbuck Lobe, the Millbrook Till, and are different from any other tills in the area. No definite age is inferred for any of these lower units. However, a 43^2-ft noncalcareous weathered sand between two of the lower tills may represent a major retreat of the ice, possibly the Sangamon Interglacial stage.