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This area threw me for a loop. Orthic Black Chernozems are common on the prairies, but usually the A horizon tops out at about 30 cm. Further, Glaciolacustrine deposits are usually nearly level.
This A went to 60 cm, and was on hummocky topography. What gives? Well the topography was bedrock controled as I was in the foothills and the proximity to the mountains (colder temps and erosional deposition) yielded the deepest topsoil I've seen to date
