Source and origin of Roxana silt and middle Wisconsinan midcontinent glacial activity

Auteurs :
JOHNSON, W. H.
FOLLMER, L. R.

Description :
Roxana distribution suggests the major source was drainage from the upper Mississippi River valley, and variations in loess thickness in Illinois can be explained by consideration of valley width, depth, orientation and post depositional erosion. Tills in the headwaters region of the ancient Mississippi drainage system in Minnesota and Wisconsin occur in the appropriate stratigraphic position and have colors and mineralogic compositions that suggest they could be the parent till of the Roxana.


Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 1989, vol. 31, n°. 3, p. 319-331, Références bibliographiques : 61 réf.

Date :
1989

Editeur :
Pays édition : Etats-Unis, San Diego, CA, Elsevier