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Geology of Fallen Leaf LakeField Assignment

Deanne BelardinoGEL 1036/18/2014

Fallen Leaf Lake•Fallen Leaf Lake is located in the Lake Tahoe region•The lake was created by two or more glaciers that traveled northward down the Glen Alpine valley.•The lake would be a bay similar to Emerald bay if the glacier had continued instead of stopping.•("Fallen Leaf Lake (California)", n.d.,)

Plants of the area

Wyethia Mollis (Mules Ears)•This flower is in the sunflower family•The leaves are soft, covered in wooly hairs. They are oval shaped leaves.•The flowers are yellow with seeds inside. The seeds are edible.•This plant is native to the Sierra Nevada area.•("Wyethia mollis", n.d.,

Quaking Aspen Trees (Populus tremuloides)

•Deciduous tree in the willow family•Trees grow wild and in big groves•("Facts on the Trembling Aspen Tree | Home Guides | SF Gate", n.d., )•The golden changing of the Aspen leaves in the fall is spectacular•Aspen trees are the stems of one of the Earths largest living organisms•Hundreds or thousands of clone trees can be joined underground by a single root network and live for thousands of years•(Rainey, n.d., )

Fallen Leaf Lake Rocks

Tallac Metasedimentary Rock•This is a foliated metamorphic rock made from granite and magma•This rock was tilted as I was standing on it and could clearly see the layers•I made this identification at the LTCC library geology exhibit •(LTCC Library, 2014)

Basalt

•Basalt is an extrusive igneous volcanic rock•Rock is composed of less than 20 percent quartz, and less than 10 percent feldspathoid.•I identified this rock by the black color•This rock was formed by the rapid cooling of basaltic lava

Chert•Chert is a sedimentary rock made of quartz•This rock appears red due to the iron oxides in the rock•This is a seafloor rock that forms at shallow depths of burial•("About Chert", n.d., )

Granite •The most common rock in the Sierra Nevada region•Common felsic intrusive igneous rock•This granite is grey in color•Made up of at least 20 percent quartz and up to 65 percent alkali feldspar•("Granite - Wikipedia,, n.d.,)•The earliest granite of the area started to form in the Triassic period•This particular granite is weathered

Granodiorite• Similar to Granite in that it is an intrusive igneous rock•Has more plagioclase feldspar than orthoclase feldspar• This is a plutonic igneous rock that forms by an intrusion of silica rich magma that cooled in the Sierra Nevada Basolith•("Granodiorite", n.d., )

References• About Chert. (n.d.). Retrieved June 20, 2014, from http://

geology.about.com/od/more_sedrocks/qt/About-Chert.htm• Basalt. (n.d.). In Wikipedia, the free encyclopedia. Retrieved June 20, 2014, from http://

en.wikipedia.org/wiki/Basalt• Facts on the Trembling Aspen Tree | Home Guides | SF Gate. (n.d.). Retrieved June 20, 2014,

from http://homeguides.sfgate.com/trembling-aspen-tree-75411.html• Fallen Leaf Lake (California). (n.d.). In Wikipedia, the free encyclopedia. Retrieved June 22,

2014, from http://en.wikipedia.org/wiki/Fallen_Leaf_Lake_(California)• Fun Facts & History | Keep Tahoe Blue. (n.d.). Retrieved June 22, 3014, from http://

keeptahoeblue.org/abouttahoe/history-facts/• Granite - Wikipedia, the free encyclopedia. (n.d.). Retrieved June 20, 2014, from http://

en.wikipedia.org/wiki/Granite• Granodiorite. (n.d.). In Wikipedia, the free encyclopedia. Retrieved June 20, 2014, from

http://en.wikipedia.org/wiki/Granodiorite• LTCC Library, 2014• Rainey, A. (n.d.). Facts on Quaking Aspen Trees & Aspen Tree Photos. Retrieved 20, 2014,

from https://suite.io/alli-rainey/2c93218 • Wyethia mollis. (n.d.). In Wikipedia, the free encyclopedia. Retrieved June 22, 2014, from

http://en.wikipedia.org/wiki/Wyethia_mollis