South lake tahoe a geolocic study
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The document summarizes the geology and landscape of South Lake Tahoe. The basin was formed 2-3 million years ago by block faulting, which uplifted the Carson Range and Sierra Nevada mountains and created the basin between. Glaciers during the ice age shaped the modern lake about a million years ago, carving features like Emerald Bay. The area features various rock types including igneous basalt and granite, and metamorphic phyllite. Native plants include the Manzanita shrub and the red Snow Plant that grows in spring when snow melts.
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The document provides information on various geological topics including types of rocks (granite, slate, marble), plants (ponderosa pine tree, snow plant), animals (Rocky Mountain mule deer), and geological principles (original horizontality, types of unconformities). It includes definitions, descriptions, examples, and citations for each topic. The document contains a table of contents and is intended to be an informative reference on South Lake Tahoe geology.
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Yosemite National Park is located in California and covers 1,190 square miles. It was established in 1890 and contains many unique granite rock formations that were created by glaciers during the last Ice Age. Some of the most notable formations include Half Dome, El Capitan, and Cathedral Rocks. The park also features many lakes, meadows, waterfalls like Yosemite Falls, and diverse plant and animal wildlife across different habitat zones. Granite is the dominant rock type in the park and was formed deep underground from slowly cooling magma. Over time, erosion sculpted the granite into the stunning landscapes seen today.
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The Lake Tahoe basin was formed 2-3 million years ago by geologic block faulting which caused chunks of land to drop down and form a basin. This basin eventually filled with water from snow, rain and streams to form the ancestral Lake Tahoe. Modern Lake Tahoe was then shaped by glaciers during the ice age. The primary rock found in the basin is granite, an igneous rock formed from cooled magma. Animals commonly seen around Lake Tahoe include bald eagles, raccoons, and the flowering Shasta daisy is a prominent plant.
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South lake tahoe a geolocic study
- 1. South Lake Tahoe A field Study By: Wendy Vazquez
- 2. Table of Contents • Formation of the basin • Landscaping of Lake Tahoe • Igneous-Basalt Rock • Granite Rocks • Metamorphic Rocks • Manzanita Arctostaphylus • Snow plant • Reference
- 3. Lake Tahoe Basin The basin is bounded by the Sierra Nevada to the west and the Carson Range to the east. Lake Tahoe basin was formed by a block faulting 2 to 3 million years ago(Gould,2012). The uplifted block created the Carson Range and the Sierra Nevada. Down dropped blocks created the Lake Tahoe Basin in between high peeks.
- 4. Modern Lake Tahoe Lake Tahoe was shaped and landscaped by glaciers during the ice age about a million years ago (Antonucci,2012). The lake is drained by the Truckee River. During the Pleistocene there were many glacial periods in the Sierra Nevada (Resendes,2012). The weight of the glaciers would cause them to go down hill and picking up sediments, rock and boulders as they went down. Glacial moraine deposits have created some of the most striking shoreline features along the west side of the lake including emerald bay and Fallen Leaf Lake( Michaelsen).
- 5. Igneous- Basalt Igneous basalt is mostly common in Earth’s crust and it also makes up most of the oceans floor. This rock is made by dark colored minerals pyroxene and olivine(Basalt). This rock also contains mineral crystals that are very hard to see because the quick cooling of the rock prevents large crystals from forming. Basalt forms when lava reaches the earths surface at a volcano or mid ocean ridge it cools quickly within a few days or weeks and forming a solid rock (Basalt).
- 6. Granite Rocks Granite is the best know igneous rock. Granite is light colored with grains large enough to be visible. This rock forms from the slow crystallization of magma below earths surface. The mineral composition usually gives granite a red, pink, gray or white color with dark mineral grains that are visible throughout the rock( Granite,2005).
- 7. Metamorphic Rock The formation of the metamorphic rock was that lava plumes reached a block of sedimentary under the shallow sea. Tops of the lava plumes pushed through the rock leaving outcrops of altered sedimentary rock called metamorphic rock (Hill). This is made up of fine grained mica their surface of phyllite is typically lustrous and sometimes wrinkled.
- 8. Manzanita Arctostaphylus The Manzanita Actostaphylus have small white flowers. This species has a hard attractive wood. There are about 106 different types of Manzanita species. Having a rich fossil record is considered to be of Miocene origin about 15 million years with radiation of the genus occurring 1.5 million years ago during the Pleistocene (Schaefer).
- 9. Snow plant Snow plant is a red, fleshy, glandular –hairy saprophyte lacking chlorophyll with simple stems either solitary growing up to 20 inches tall(Sarcodes). It has evolved with angiosperms, flowering plants with enclosed seeds. This plant did not arrive near the Lake Tahoe are until other plants michorrhizae that it could be able to gain nutrients from(Monroe & Wicander) . This plant grows when snow begins to melt.
- 10. Reference Antonucci, D. C. (n.d.). Lake Tahoe Fast Facts . In Tahoe Fund. Retrieved July 19, 2013, from http://www.tahoefund.org/about-tahoe/recreational-paradise/ Basalt Rock (n.d.). In Window To The Universe. Retrieved August 1, 2013, from http://www.windows2universe.org/earth/geology/ig_basalt.html Gould, M. (2012, December 13). Geography & History Overview. In Geography the National Map. Retrieved July 18, 2013, from http://tahoe.usgs.gov/geography.html Granite (2005). In Geosciene News and Information . Retrieved August 2, 2013, from http://geology.com/rocks/granite.shtml Hill, M. (n.d.). The Formation of Lake Tahoe and Filling the Basin . In Geology . Retrieved August 1, 2013, from http://eh2o.saic.com/tiimsWebsite/Content/BasinTopics/geology/default.asp Michaelsen, J. (n.d.). In Sierra Nevada Physical Geography . Retrieved August 2, 2013, from http://www.geog.ucsb.edu/~joel/g148_f09/readings/sierra_nevada/sierra_nevada.html Monroe & Wicander, R.(2009).The Changing Earth: Exploring geology and evolution. Belmont, CA:Brooks/Cale, Cengage Learning. Resendes, M. (2012). Geology Of The Sierra Nevada . In Central Sierra Historical Society. Retrieved July 27, 2013, from http://www.sierrahistorical.org/geology-sierra-nevadas Sanguinea, S. (n.d.). Snow Plant . In Sarcodes Sanguinea . Retrieved July 19, 2013, from http://www.calflora.net/bloomingplants/snowplant.html Schaefer, B. (n.d.). Arctostaphylus . In Biogeography of Ravens Manzanita . Retrieved August 2, 2013