Shifting shorelines at Lake Tahoe caused by ancient lava dams

ScienceDaily | 2/13/2018 | Staff
kringkring (Posted by) Level 4
Consequently, three former raised shorelines are marked by subaerial lava flows overlying subaqueous lava deltas. In addition, eruptions from isolated vents on the lake floor produced tuff cones. Six new radiometric argon ages define three episodes when lava erupted subaerially and flowed into the lake. Lava from each of these cycles dammed the lake outlet in the Truckee River Canyon, causing the lake to rise nearly 200 m, after each of which the dams were eroded and the lake returned to near its present level.

The canyon was dammed at 2.3 million years ago (Ma), which raised the lake level from about 1896 m above sea level to 2048...
(Excerpt) Read more at: ScienceDaily
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