Nature and origin of corrugated ground moraine of the Des Moines lobe, Story County, Iowa

Auteurs :
STEWART, R. A.
BRYANT, D.
SWEAT, M. J.

Description :
The nature of the till and related glaciofluvial sediments at each site suggests that the corrugation ridges formed in basal cracks or crevasses in the Des Moines lobe. The cracks are postulated to have formed during extending flow of the Des Moines lobe as it advanced toward its terminal position. Retreat of the Des Moines lobe was rapid enough to preclude significant accumulations of supraglacial sediment upon corrugated ground moraine.


Type de document :
Article de périodique

Source :
Geomorphology, 1988, vol. 1, n°. 2, p. 111-130, Références bibliographiques : 51 réf.

Date :
1988