Qu'Appelle Valley Geolog Stop 9
- Lebret Outwash Plain
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Approximately 14,000 years ago, the Battleford glacier covered the area now known as Stop 9. As this glacier melted, it issued heavy amounts of meltwater which eroded a broad, shallow valley into clay left behind by Lake Indian Head, around 1,000 years before. As melting of the glacier continued, this broad valley was filled with 12.2 metres of sand, the upper 3.0 metres of which is gravelly in the northern and eastern parts of the plain.
Precipitation that falls on the Lebret Outwash Plain does one of three things: it either returns to the atmosphere as evaporation, it returns to the atmosphere as transpiration through plants, or it percolates downward through the sand to become groundwater. Most of the water moves slowly between the sand grains to the edge of the sand plain, where it enters the ravine approximately 1.5km south of Stop 9. Here the groundwater discharges as springs, and returns to the atmosphere by evaporation and transpiration, completing the cycle.
Plant species found at stop 9:
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