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Tiger Creek Field AssignmentMatt SavoieProfessor LawlerGel 103, Spring 2013June 20, 2013
Content● Background & Method● Brief Geological History● River Geology● Rock Examples● Plant Examples● Geological Features
Background & Method● In late June, i visited an area of Tiger Creek
near the reservoir. ● The photos and rock samples included in
this report are from this field trip● 3D map images were prepared using Google
Earth● Identification of rocks done using: Geology
of the Sierra Nevada, by Mary Hill (2006)● Identification of plants done using: The Laws
Field Guide To The Sierra Nevada, by John Muir Laws (2007)
Site Location● Near Pioneer,
California● Take Tiger Creek Rd
from Hwy 88, Eventually turning right onto Salt Springs Rd.
● Coordinates 38.447973, -120.493616
Tiger Creek Terrain
View of terrain, elevation, and shrubbery that has been carved from the river flow. (Google Earth)
Quick Geological History & Overview● Sierra Nevada Range is a 400 mile long tilted
fault block.● 250 million years ago the pacific plate began to
fall below the north american plate causing subduction.
● Plutonic rock began to rise from the collison causing the mountain to begin to rise 80 million years ago.
(Resendes, M. A.)
Geology of Tiger Creek● Deep granite canyon, expert-only river rapids below
Highway 26
● Large boulders in the river; massive granite domes near
Salt Springs Powerhouse
● Steep, granitic river gorge downstream; the Devil’s
Nose
● Healthy trout fishery
● Important mid-elevation wildlife and bird habitat
(Tiger Creek to Elektra)
Rock Sample: ShaleI I believe this to be the
sedimentary rock shale. Formed by particles of clay and mud compressed by the pressure and weight of what is above.
(Peck, D)(Hill 2006)
Rock Sample: GraniteI believe this to be a sample of the Igneous rock Granite. Formed when a magma rapidly cools and crystallizes deep underground. The course crystals are pressed together and form this rock.
(Peck,D)(Hill 2006)
Plant Sample: Himalayan Blackberry
● I believe this to be a Himalayan Blackberry bush (Rubus Armeniacus)
● This bush is of the family Rosacea, under the order Rosales.
● Descended from early angiosperms.
● introduced for cultivation, but then spread due to birds and other animals
(Laws 2007)(Rubus Armeniacus)
Plant Sample: White Fir● I believe this to be a White Fir
(Abies Concolor)● This tree is from the family
Pinaceae, under the order Pinales● It is a cone bearing tree most likely
evolving from early non-flowering vascular plants.
● It is native to the Great Basin Mountains, and generally lives at altitudes of 1700-3400 m
(laws 2007)(Abies Concolor)
Plant Sample: White Alder● I believe this to be White Alder (Alnus Rhombifolia)● This tree is from the family Betulaceae, under theorder Fagales.● This has evolved from early vascular, flower-bearingplants.● This tree is native to the southern sierra
nevadas, 100-2,400 m(laws 2007)(Alnus Rhombifolia)
Additional Photos
References● 38.447973,-120.493616. (n.d.). In Google Maps. Retrieved June 23, 2013,
from https://maps.google.com/maps?hl=en&tab=wl● Abies Concolor. (n.d.). In Ask.com. Retrieved June 23, 2013, from http:
//www.ask.com/wiki/Abies_concolor?o=2801&qsrc=999● Alnus Rhombifolia. (n.d.). In Ask.com. Retrieved June 23, 2013, from http:
//www.ask.com/wiki/Alnus_rhombifolia?o=2801&qsrc=999● Laws, J. M. (2007). The Laws Field Guide To The Sierra Nevada
(Illustrated ed.). N.p.: Heyday.● Peck, D. (n.d.). The Rock Identification Key. In Rock Hounds. Retrieved
June 23, 2013, from http://www.rockhounds.com/rockshop/rockkey/● Resendes, M. A. (n.d.). Geology of the Sierra Nevada. In Sierra Historical.
Retrieved June 23, 2013, from http://www.sierrahistorical.org/geology-sierra-nevadas
● Rubus Armeniacus. (n.d.). In Ask.com. Retrieved June 23, 2013, from http://www.ask.com/wiki/Rubus_armeniacus?o=2801&qsrc=999
● Tiger Creek to Elektra. (n.d.). In Foothill Conservancy. Retrieved June 23, 2013, from http://www.foothillconservancy.org/pages/ws_tiger.cgi
The End