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Tahoe League for Charity: The geology of Lake Tahoe

Linda Schwoob
Special to the Sun
Frances Pierce is a retired geologist from the U.S. Geological Survey.
Courtesy photo |

The Tahoe League for Charity held its March 9 meeting at Jake’s on the Lake in Tahoe City, featuring a presentation from Frances Pierce, a retired geologist from the U.S. Geological Survey.

Pierce, a current volunteer docent at the UC Davis Tahoe Environmental Research Center in Incline Village, spoke on the geology of Lake Tahoe — starting with intrusion of granitic rock that formed what is now the Sierra Nevada, followed by faulting 3-5 million years ago that resulted in a down-dropped block with uplifted mountains to the east and west.

About two million years ago, volcanic eruptions at the north end of the lake dammed the basin and a shallow lake began to form. Over time, glaciers, continued faulting, large debris slides, and extended periods of drought have modified the mountains surrounding the lake and caused lake level to rise far above modern levels and fall well below the natural rim.

For more information on Lake Tahoe’s geology, call TERC at 775-881-7566.

The Tahoe League for Charity’s April monthly meeting will feature Mindy Carbajal, executive director of the Boys and Girls Club of North Lake Tahoe in Kings Beach. Carbajal will speak on the many programs and resources available for the youth of the community.

For information on attending the TLC Luncheon/Speaker events, contact Linda Schwoob at lschwoob@yahoo.com. The meeting is Monday, April 13, at Jake’s from 11:30 a.m. to 1:30 p.m.; $17 per person, and reservations are recommended.

Linda Schwoob is Publicity Chair for Tahoe League for Charity. Visit tahoeleagueforcharity.org to learn more.


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