Terraces are bench-like surfaces that break the continuity of the valley slope. Such terraces are remnants of former valley bottoms. In the case of the Lebret Terrace, when the Qu'Appelle Valley was formed, a layer of sand and gravel was deposited on the valley floor. Later on, a spillway eroded a portion of the sand and gravel deposits and leaving others, creating two separate levels of ground.

Unfortunately, Stop 4 has been changed by construction and urbanization of the area. Currently the Lebret Terrace is being used as a gravel pit, and there has been much disturbance and upheaval to local vegetation. Most of the plants on the terrace now are early succession plants. However behind the gravel pits, on the north side, the land has been largely undisturbed and numerous amounts of late succession plants are growing there.

Plant species found at stop 4:

Alfalfa	Hairy golden-aster	Slender wheatgrass
Awned northern wheatgrass	Long-headed coneflower	Smooth aster
Black-fruited chokecherry	Low goldenrod	Smooth brome
Blue lettuce	Low prairie rose	Stiff goldenrod
Bluebur	Manitoba maple	Stinkweed
Canada thistle	Many-flowered aster	Trembling aspen
Common pepper-grass	Northern awnless brome	Western snowberry
Crested wheatgrass	Northern wheatgrass	White sweet-clover
Dandelion	Pasture sage	Wild licorice
Dotted blazingstar	Pineappleweed	Wild oat
Flixweed	Plains wormwood	Wolfwillow or Silverberry
False ragweed	Prairie sage	Wood blue grass
Foxtail barley	Red-osier dogwood	Wood's rose
Graceful (Canada) goldenrod	Saskatoon	Yarrow
Gumweed	Silverleaf psoralea	Yellow sweet-clover