Abstract

The hitherto unrecognized features of Leverett's ridged drift of the Kaskaskia Basin throughout its course from the Shelbyville moraine in south central Illinois nearly to Belleville in southwestern Illinois; its genetic crevasse ridges, subcrevasse channels on the land surface, and moulin kames; together with sparse but wide distribution of similar features over the greater part of the Illinoian drift area east of Illinois and Mississippi rivers attest to the stagnant condition of the Illinoian glacial lobe for this region after it had reached its terminus and made its marginal deposits.

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