Dave's Tahoe Geology Trivia Challenge

For a number of years I have been giving Trail Talks to audiences on the Geologic History of Lake Tahoe as a way to reach out and encourage people to support the TRTA through their memberships, donations and/or volunteering. Unfortunately that's not possible this year.  So instead I'm offering to post a bit of Tahoe geology trivia on the TRTA Facebook page for each $25 increase in funds raised on this page in the next month . The posts will include geologic features you can look for along the Tahoe Rim Trail and in the surrounding region. After all, people can only take in the views of a majestic lake, towering trees, colorful flowers, and scampering critters for so long until they start to wonder about the rocks under their feet!