Field Assignment- GEL 103

Click here to load reader

  • date post

    25-May-2015
  • Category

    Education

  • view

    301
  • download

    0

Embed Size (px)

Transcript of Field Assignment- GEL 103

  • 1. Field AssignmentBishops Peak and Leaning Pine Arboretum
    Amanda Nelson
    GEL 103
    Professor Lawler

2. Content
Background and Locations
Bishops Peak
Geological History of the Peak
Rock Example
Peak Rock Example
Leaning Pine Arboretum
Geological History of Cal Poly Land
Rock Example
Animal Example
Plant Example
Fossil Example
Conclusion
Works Cited
3. Background and Locations
I chose to venture near and around our Cal Poly campus for this Field Assignment
Places I went to:
Bishops Peak
Leaning Pine Arboretum
The photos are taken from my visits to both locations
Identifications are done using brochures, Sierra Clubs website on the Nine Sisters of San Luis Obispo, Cal Poly resources, and online databases
4. Bishops Peak
5. Bishops Peak Geological History
According to the Sierra Club San Luis Obispo and Gary Felsman(1)
Bishops Peak has an elevation of 1,559 feet
It formed from the plug of long-extinct volcanoes
It has been inactive for 20,000,000 years
By the look of the mountain, there is another mountain that has formed around Bishops. It seems as though there are faults present and a fold has occurred
Bishops peak is primarily composed of dacite. Over 20 million years ago, magma welled up underneath a layer of softer rock and solidified. The softer overlying rock has since eroded away, leaving a distinct rugged shape. (2)
1. Felsman, Gary (2008). Sierra Club San Luis Obispo- The Nine Sisters of San Luis Obispo County. Retrieved from http://santalucia.sierraclub.org/ninesis.html#bishop
2. Wikipedia- Bishops Peak. Retrieved from http://en.wikipedia.org/wiki/Bishop_Peak_%28California%29
6. Igneous Volcanic Rock- Dacite
7. Igneous Volcanic Rock- DaciteDescription
I found these rocks at the bottom of the mountain. I expect these volcanic rocks are evidence of a landslide that has occurred
They were an interesting red and grey color and many were located off to the side as though they had fallen
Dacite primarily forms from lava flows, dikes, or massive intrusions (3)
3. Dacite. (2011). In Encyclopdia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/149437/dacite
8. Bishops Peak- Igneous Volcanic Rock- Dacite
9. Bishops Peak- Igneous Volcanic Rock- Dacite
Weather conditions has cut and widened cracks into gaps on their surfaces. (4)
This makes the top of Bishops Peak appear like a montage of boulders.
Bishops peak is a great example of dike injections of magma. (5)
It also displays the movement of magma that persisted long ago and shows that weather conditions have created erosion
4.Felsman, Gary (2008). Sierra Club San Luis Obispo- The Nine Sisters of San Luis Obispo County. Retrieved from http://santalucia.sierraclub.org/ninesis.html#bishop
5. Felsman, Gary (2008). Sierra Club San Luis Obispo- The Nine Sisters of San Luis Obispo County. Retrieved from http://santalucia.sierraclub.org/ninesis.html#bishop
10. Leaning Pine Arboretum
11. Leaning Pine Arboretum Geological History
Cal Poly land was once part of an ocean floor
20 million years ago, the Pacific Plate pushed against the North American Plate and broke the oceanic crust apart, leaving behind sediments of rocks and minerals (6)
Cal Poly land is full of nature and life, but most of all, it is full of history
It has changed over time, but remains from historys past still exist
6. Cal Poly Land- Geology and Soils. Retrieved fromhttp://polyland.calpoly.edu/overview/archives/derome/geology.html
12. Metamorphic Sedimentary Rock- Serpentinite
13. Metamorphic Sedimentary Rock-Serpentinite Description
Walking around this location, I found many rocks of this kind and I predict they have been around for many years because they show signs of different weathering conditions
The theory is that serpentine is created through a high pressure and low temperature metamorphism of mantle rock or oceanic crustal rock (7)
Pre-existing rocks undergo metamorphic changes in a solid state to create new minerals from rearrangement of mineral components within the surrounding rocks or material (8)
Serpentine is the most common rock found on Cal Poly Land
7. Cal Poly Land- Geology and Climate. Retrieved from http://polyland.calpoly.edu/topics/Geology/index.html
8. Cal Poly Land- Geology and Climate. Retrieved from http://polyland.calpoly.edu/topics/Geology/index.html
14. Western Fence Lizard
15. Western Fence Lizard Description
Kingdom: Animal
Phylum: Craniata
Class: Reptilia
Order: Squamata
Family: Phrynosomatidae
Genus: Sceloporus
This black and brown blotched reptile is active on Cal Poly land during spring and summer and can grow between 10 and 15 centimeters long (9)
They may not have naturally evolved in California, but they locate themselves here because they need to be in the sun in places with rocks and fences as much as possible because they are cold blooded (10)
9. Cal Poly Land- Reptiles and Amphibians. Retrieved from http://polyland.calpoly.edu/topics/florafauna/studentsites/2006b/Blue-Bellied%20Lizzard.htm
10. Wikipedia- Western Fence Lizard. Retrieved from http://en.wikipedia.org/wiki/Western_fence_lizard
16. Buckeye Californica Tree
17. Buckeye Tree Description
Kingdom: Plantae
Order: Sapindales
Family: Sapindaceae
Genus: Aesculus
Species: Californica
This tree can survive in a variety of conditions, though losing its leaves in mid-summer, and acts as a soil binder, preventing erosion in hilly regions (11)
Based on these facts, this tree could be found useful in areas such as San Luis Obispo because we are surrounded by mountainous regions
Historically, the seeds of the Buckeye Californica Tree were used by the Native Americans for food
11. Wikipedia- AesculusCalifornica. Retrieved from http://en.wikipedia.org/wiki/Aesculus_californica#Distribution_and_habitat
18. Fossil
19. Fossil Description
I found this fossil as we were leaving the Arboretum (I do not know where it was first located)
There is no identification, but my best prediction is that it is the head of a deer or another similar animal
The fossil seems to be cleaned up but untouched for quite sometime because of the cobwebs inside
The age is unknown, but if this were a deer, the head has become longer over time and eye sockets are slightly smaller
The nose of this fossil confuses me because it is very different then that of a deer that would exist today
20. Conclusion/ What I Learned
I found this field assignment to be very interesting, not only because it furthered my knowledge of local San Luis Obispo geological features, but also because I learned about how the land around me has changed and evolved since its beginning
I never knew that Bishops peak had once been a volcano and how the Cal Poly land had formed from the Pacific Plate and North American Plate pushing together
I walk around my campus now being able to identify certain rocks and other features, and having a deeper understanding of their history
21. Works Cited
AesculusCalifornica (2011). Curbstone Valley Farm. Retrieved from http://curbstonevalley.com
Cal Poly Land- Geology and Climate. Retrieved from http://polyland.calpoly.edu/topics/Geology/index.html
Cal Poly Land- Geology and Soils. Retrieved fromhttp://polyland.calpoly.edu/overview/archives/derome/geology.html
Cal Poly Land- Reptiles and Amphibians. Retrieved from http://polyland.calpoly.edu/topics/florafauna/studentsites/2006b/Blue-Bellied%20Lizzard.htm
Dacite. (2011). In Encyclopdia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/149437/dacite
Felsman, Gary (2008). Sierra Club San Luis Obispo- The Nine Sisters of San Luis Obispo County. Retrieved from http://santalucia.sierraclub.org/ninesis.html#bishop
Wikipedia- AesculusCalifornica. Retrieved from http://en.wikipedia.org/wiki/Aesculus_californica#Distribution_and_habitat
Wikipedia- Bishops Peak. Retrieved from http://en.wikipedia.org/wiki/Bishop_Peak_%28California%29
Wikipedia- Western Fence Lizard. Retrieved from http://en.wikipedia.org/wiki/Western_fence_lizard