Glacial transport and sedimentation
103
A
(a)
Deformation
Figure 4.15. (a) Load-deformation curve for a glacial till. (b) Cross section at the edge of a glacier, with
critical stress conditions for drumlin development (adapted from Smalley and Unwin (1968)).
The material is of supraglacial or englacial origin; it reaches the surface along shear planes
and slides over the ice surface, or is deposited by the ice when it melts (Sugden and John,
1976). These moraines have a ridge form and are located in the glacier marginal areas.
These marginal moraines include the deposits carried as medial moraines and lateral
moraines (Figure 4.10) that join the end moraines forming large moraine ridges. In these
moraines the rock fragments do not show a preferred orientation, although some inherited
fabric can be recognized.
Those glaciers that end on land supply large volumes of material to their marginal
environments. The quantity of particles deposited depends on the volume of solid material
103
A
(a)
Deformation
Figure 4.15. (a) Load-deformation curve for a glacial till. (b) Cross section at the edge of a glacier, with
critical stress conditions for drumlin development (adapted from Smalley and Unwin (1968)).
The material is of supraglacial or englacial origin; it reaches the surface along shear planes
and slides over the ice surface, or is deposited by the ice when it melts (Sugden and John,
1976). These moraines have a ridge form and are located in the glacier marginal areas.
These marginal moraines include the deposits carried as medial moraines and lateral
moraines (Figure 4.10) that join the end moraines forming large moraine ridges. In these
moraines the rock fragments do not show a preferred orientation, although some inherited
fabric can be recognized.
Those glaciers that end on land supply large volumes of material to their marginal
environments. The quantity of particles deposited depends on the volume of solid material