Along its north side, the crater is truncated by a steep scarp of one of these cuestas and a 600-meter (2,000 ft) wide and 248-meter (814 ft) deep basin. Distinct 200–500-meter (660–1,640 ft) long and 75–100-meter (246–328 ft) wide streamlined glacial lineations cut across the southern half of the Corossol structure.[2] The cuestas and associated paleovalleys likely were created by fluvial erosion during regional sea-level lowstand(s) that likely predates Quaternary glaciations.[3][4] The passage of the Laurentide Ice Sheet formed the streamlined glacial lineations that cut across the southern half of the Corossol structure. The orientation of these lineations indicate SE–SSE-directed ice flow that scoured the surface of the Corossol structure.[1][2]