This slideshare is my field assignment for Geology 103, Professor Lawler. It shares pictures and information about the Thunder Mountain area of California, near Kirkwood.
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2. Thunder Mountain
Kirkwood, CA
Thunder Mountain is located off Highway 88 between
Silver Lake and Kirkwood.
The hike used for this field study begins at 7,600 feet
and ends at 9,400 feet.
The geographic coordinates for this location are
38.677642, -120.091370
Thunder Mountain is part of the Mehrten Formation
3. ● 225 million years ago, Farallon plate subducted
beneath the Pacific plate
● Heat caused underlying crust to melt, forming
magma, and then forming a series of granitic plutons
which are the Sierra Nevada batholith
● A chain of volcanoes formed above the magma,
erupting and leaving ash, mud flows, and basaltic
rock behind.
● The entire region underwent uplifting and tilting
● The granite batholith is now exposed around the
Silver Lake area, just below Thunder Mountain
● Thunder Mountain is primarily made up of mud and
ash flow remnants (TUSD.org, n.d.)
A Short Geological History
6. The Mountain
• A granitic batholith sits beneath the mountain,
formed during the Triassic Period
• Uplift, tilting, and volcanic action followed, building
the mountain to its current height of 9,400 feet
• Deposits of volcanic tuff and ash flow are most likely
from the late Miocene (Busby, et. al. 2008)(1)
• The U-shaped valley is indicative of glaciation and
erosion which took place during the Pleistocene(2)
• The massive pile of dirt is also indicative of on-going
erosive forces of snow, wind, and rain as it breaks
down the mountain and flows into the valley(3)
8. Grasshopper
• Order Orthopera, Suborder Caeliferam Genus
Xanthippus
• They are widely diverse
• Stridulation causes a clicking or singing noise, used
for mating and warning
• They eat plant and animal material
• Their camouflage is an adaptation to hide from
predators - there are many varieties with differing
camouflage for different habitats
• It is thought that they remain in egg formation during
the harsh winters and appear in June after the snow
melts - this makes them well-adapted to the harsh
conditions in the high Sierra
9. Evolutionary tree for the
order Orthoptera,
suborder Caelifera
(n.d.). Retrieved August 1, 2015, from
https://entomologytoday.files.wordpress.com/2015/04/orthoptera-
hojun-large-wp.jpg
11. • Species: Pinus Ponderosa
• Thick bark protects against fire
• Fires destroy undergrowth allowing the pines to flourish
and survive
• Commonly used species for tree-ring dating
• Large trees can live more than 500 years
• Exact origin is unknown
• Oldest fossil is 600,000 years old, found in West Central
Nevada (Bettancourt, 1990)
• Thrives in basaltic soil
• Evidence of genetic diversity indicates this survived the
glaciation of the Pleistocene Epoch (Meisenbach, 2003)
14. Breccia
This is an example of breccia. At first I thought this was
conglomerate, but the clasts are angular in nature,
indicating they were carried a short distance with
minimal erosion. Conglomerate has rounded clasts.
Breccia is plentiful in the Thunder Mountain area.
During the Nevadan Orogeny, mud and ash flowed
down the mountain collecting country rock as it did,
then hardening into the breccia we see today.
This occurred during the late Jurassic period.
This is a clastic sedimentary rock.
15.
16. Scoria
This gray rock is an example of Scoria. Scoria forms
when gases are trapped in flowing magma (lava)
during a volcanic eruption. As the magma leaves the
volcano as lava and cools, the gases start to escape
as bubbles some becoming trapped and forming
holes, or vesicles, in the hardening rock. Another
name for this rock is vesicular basalt. One reason I
believe this is Scoria and not pumice is the presence
of basalt in the region, showing a basaltic eruption,
not a rhyolitic eruption.
This is an igneous rock.
17. Two examples of basalt. The red rocks on the left
show basaltic rock that has been weathered and
oxidized due to the high iron content in the rock. I
believe this is basalt because of its fine grains
and rough texture. The black xenolith on the left
is the basalt I typically see in the mountains. It is
a dense rock with fine grain minerals and a rough
texture.
18. Basalt
• Basalt is a fine grained, dark igneous rock formed from
quickly cooling lava flows.
• It contains primarily plagioclase and pyroxene minerals.
• The red rock had me puzzled. In researching, I found
andesite to also be a possibility for this rock, which is still a
basaltic rock, but a rock somewhat between basalt and
granite. (William Rowe, Paul Carpenter)(King,2015)
• This is an igneous rock.
20. Law of Original
Horizontality
● This layer in the rock shows
the law of original
horizontality.
● Rock layers were formed in a
horizontal fashion, newer
layers flowing over older
rock.
● In this particular case, we
see the results of separate
volcanic events.
Heterogeneous volcanic debris-flow deposit overlain by more homogeneous block-and-ash-flow tuff on The Sentinels, above Kirkwood Ski area
(Carson Pass; ss—sandstone interbed). People circled for scale. (Busby, et al. 2008)
22. Disconformity
● The arrow is pointing to a disconformity
where the igneous rock (tuff) meets older,
sedimentary rock.
● Erosion here has not been consistent
between the top of the bluff and the valley
floor.
● There is a clear line where the newer rock
meets the older rock, where the arrow is
pointing.
(Unconformities, n.d.)
23. References
• Basalt. (n.d.). Retrieved July 31, 2015, from http://geology.com/rocks/basalt.shtml
• Betancourt, J.L. 1987. Paleoecology of pinyon-juniper woodlands: U.S. Department of Agriculture, Forest Service,
Intermountain Research Station.
• Busby, C., Hagan, J., Piturka, K., Pluhar, C., Gans, P., Wagner, D., . . . Skilling, I. (2008). Retrieved July 31, 2015.
• Carpenter, Paul. via Gmail
• Evans, A. (2007). National Wildlife Federation field guide to insects and spiders & related species of North America. New
York: Sterling Pub.
• Imai, T., Skilling, I., & Busby, C. (n.d.). Peperite-Fed Andesitic Debris Flows in the Miocene Mehrten Formation, Kirkwood,.
Retrieved July 31, 2015.
• Kershner, B. (2008). National Wildlife Federation field guide to trees of North America. New York: Sterling Pub.
• King, H. (n.d.). Andesite. Retrieved July 31, 2015.
• Klots, A., & Klots, E. (1971). Insects of North America. New York: Doubleday.
• Little, E. (1979). The Audobon Society field guide to North American trees, western region. New York: Knopf.
• Marshall, S. (2008). 500 insects: A visual reference. Richmond Hill, Ont.: Firefly Books.
• Milne, L., & Milne, M. (1995). National Audubon Society field guide to North American insects and spiders (A Chanticleer
Press ed.). New York: Knopf.
• (n.d.). Retrieved August 1, 2015, from http://www.tusd.org/Portals/5/Teachers/.../Chapter 6 Section 4.do
• (n.d.). Retrieved August 1, 2015, from https://entomologytoday.files.wordpress.com/2015/04/orthoptera-hojun-large-wp.jpg
• Petrides, G., & Petrides, O. (1992). Western trees: Western United States and Canada. Boston: Houghton Mifflin.
• Rowe, William. via Gmail
• Scoria. (n.d.). Retrieved July 31, 2015, from http://geology.com/rocks/scoria.shtml
• Unconformities. (n.d.). Retrieved August 1, 2015, from
http://www.indiana.edu/~geol105b/images/gaia_chapter_6/unconformities.htm
• United States. National Park Service. (2015, July 31). Ponderosa Pine. Retrieved July 31, 2015.