In 1960, White Glacier had a steep but easily accessible tongue, fronted by a recessional moraine
. Thompson Glacier, on the other hand, ended in a steep cliff, fronted by a distinctive push moraine, a characteristic feature of advancing Arctic glaciers (Evans and England, 1991).
The test pit was located on a slight hummock (less than 1.5 m [5 ft] of relief) that has been mapped as one of the northernmost elements of the London Moraine, a low, recessional moraine (see Fig.
Core sites were on lake plain, ground moraine, and several types of ridge moraine: recessional moraine (St.
c) LP = lake plain, GM = ground moraine, EM = end moraine, RM = recessional moraine, SM = superposed moraine.
Sharply radiating fine striae were made during thinning ice of later stages for, at the margins of lobes, these aim across the high parts of deep engravings and locally are per-pendicular to recessional moraines
Thus beaches are correlated with recessional moraines
, and the beach elevation remains the same until the ice barrier retreats to a position where a new lake outlet is exposed.
Across Indiana, there are series of recessional moraines
that record stationary ice-margins (Gray 1989) composed of glacigenic material (sand, gravel, and till).