Ah, look at the large boulders at Lone Pine Camp.

Definitely a jokulhlaup created the canyon from the Meysan Lakes area and brought down those long boulders with it on slabs of ice and debris.

After that cataclysm, the waters continued to flow explaining the sedimentary formation of smoothed rocks near Lone Pine Creek close to town.

Take a gander next time when in town.
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Journey well...