- Usage in publication:
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- Heyworth Drift
- Modifications:
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- Named
- Dominant lithology:
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- Till
- AAPG geologic province:
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- Illinois basin
Summary:
The only formal morphostratigraphic units recognized in IL are units related to moraines that are called "drifts." Is named for Heyworth, McLean Co, IL (Illinois basin); is based on the Heyworth Moraine (mapped on pl. 1), a weakly morainic area with a maximum width of about 4 miles that extends southward from Heyworth to near Clinton, De Witt Co. The morainic topography has only slightly greater relief and roughness than the adjacent groundmoraine. However, it has a distinct front, and the crest is 40 to 50 ft higher than the surface west of the moraine. A morainic ridge trending northeast-southwest, a mile southeast of Clinton, is included in the moraine. The orientation and lack of continuity of both segments suggest the possibility that they are related to features buried by Shelbyville Drift. Deposited by the Decatur Sublobe of the Erie Lobe. Assigned to Woodfordian Substage of Wisconsinan Stage in Pleistocene Series.
Source: GNU records (USGS DDS-6; Denver GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).