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South lake tahoe, ca
- 1. South Lake Tahoe, CA Lab Field Project Geology 103 By Andrea Mateo June 24, 2018
- 2. History of Lake Tahoe • Introduction • Land formations • Fauna • Rocks • Steno’s Law
- 3. South Lake Tahoe • The basin of Lake Tahoe is an excellent area to find evidence of many different types of geology events. During this field project I was able to identify magmatic intrusion, volcanism, glacial sourcing, fauna, uplifting and extension of plate tectonics. Photos credits in this presentation are mine, unless noted
- 4. How was the lake formed? • This beautiful lake was created about twenty-four million years ago. By the rise and fall of landscapes due to faulting. • Following the faulting and volcanic period was an ice age where huge glaciers formed. • As the glaciers melted away clear lakes were formed, brilliant bays and jagged peaks.
- 5. Fun Facts about the Lake • Third deepest lake in North America • Twenty-two miles in length • Twelve miles wide • Greatest depth measured 1,654 feet • The lake has thirty-seven trillion gallons of water • Sixty-three streams flow into Lake Tahoe and only one flows out the Truckee River http://tolhurstj.faculty.go columbia.edu/ESGIS/Earth_Science/ESC_35_Field_Geology/Lake_Tahoe/Lake_Tahoe_ Home2.htm
- 7. Lovers Peak • Lovers peak is located in the Sierra Nevada Mountain. This part of the mountain experienced major erosion about twelve thousand years ago. There was a huge glacier that split this peak in half causing permeant reshaping of the landscape. This happened because this area was fully glaciated during the glacial cycles and then deglaciated during the interglacial times (Ulmer, 2012). • https://phys.org/news/2012-02-mountain-ranges.html#jCp
- 11. Bald Eagles • Birds are ancestor of dinosaurs. • Living birds are also known as avian dinosaurs. • There is evidence that birds evolved from a small group called theropods • Birds share an evolutionary foundation with reptiles • During the Mesozoic era, the first birds began to appear • Thirty-six million years ago, the first sea eagles descended http://www.pbs.org/wnet/nature/american-eagle-bald-eagles-evolutionary-ancestors/4274/ http://www.summitside.com/p742432617/h12627BEA#h12627bea
- 12. Lupines Lupines are a native flowering plant in this area. There different types of lupine species. The most common in Lake Tahoe are silvery lupine and broadleaf lupine. The ones in the picture are broadleaf lupines. The evolution of flowering plants goes all the way back to the Late Paleozoic. Frist there was Gymnosperms a large seeded ferns that became extinct in the Early Cretaceous. Angiosperm started to appear during this time. This flowering plant was able to adapt in almost all terrestrial habits from mountains, deserts, to sea level (Wicander. Pg.593).
- 13. Jeffery Pine • “Early pine evolution was concentrated between 31° and 50° in the Northern Hemisphere on the Laurasian super- continent. During this period, pines radiated widely, and by the end of the Cretaceous, they were distributed in the west from what is presently North America “(Keeley, 2012, pg. 445). • This is the most common type of tree in South Lake Tahoe. • These trees live for about 400 to 500 years in high elevations • Grow over 170 feet tall • Native to California but ranges through Oregon and Nevada • Adaptive to stressful environments Droughts Fire Climate changes https://link.springer.com/article/10.1007/s13595-012-0201-8#Sec9
- 16. This picture is an example of Steno’s law superposition where the older rocks are on the bottom and the younger rocks on top