Abstract
Varying rates of till deformation as a function of surface topography and direction of continental ice advance are linked to pattern and form variations in drumlins. Five transects are examined morphometrically . Transects are selected on the basis of their slope and direction of ice advance. A hypothesis based on variable rates of clast lodgement and till deformation accounts for most of drumlins' spatial characteristics. The Cayuga Trough funnelled most of the ice southward and the large amounts of till mobilized contribute to high drumlin densities. The observed increase in drumlin elongation is linked to local ice surging. Away from the trough, drumlin densities and elongation begin to decrease. These trends are attributed to a less vigorous ice flow brought about by increasing surface slopes and radial ice spread. Drumlin pattern and form can thus act as effective indicators to changes in surface slope and direction of ice advance.
Recommended Citation
Francek, Mark and Blish, Roger
(1991)
"Glacio-Dynamic Variations in Central New York Drumlins: A Morphometric Analysis,"
The Geographical Bulletin: Vol. 33:
Iss.
2, Article 6.
Available at:
https://digitalcommons.kennesaw.edu/thegeographicalbulletin/vol33/iss2/6