Core sites were on lake plain, ground moraine, and several types of ridge moraine: recessional moraine (St.
General trends among all types of fractures are: 1) they develop in silt and fine- to medium-textured tills and diamict; 2) fracture aperture and frequency decrease with depth; 3) most fractures below about 6.0 m (20 ft) appear closed when viewed with low magnification; and 4) fractures are deeper in ridge moraines than ground moraine.
c) LP = lake plain, GM = ground moraine, EM = end moraine, RM = recessional moraine, SM = superposed moraine.
Near-surface horizontal fractures are deeper in ridge moraines than ground moraine (Table 2), a trend that tracks with depth of water table and depth of wintertime freezing front.
Vertical fractures are shallower on ground moraine than on ridge moraine, where hilly, dry sites are more common (Table 2).
On ground moraine, only 4 of 14 cores contained angled fractures, which, like horizontal and vertical fractures, were shallower than those on ridge moraines (see Table 2).
They almost seemed like rows of burial mounds though they could have been eroded ground moraines
. While some exotic geologic or ancient anthropologic explanation is possible, it is more likely the topography was caused by years of dumping excess fill along the edges of the swampy land.