Field Assignment- GEL 103
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Field Assignment- GEL 103 Presentation Transcript

  • 1. Field AssignmentBishop’s Peak and Leaning Pine Arboretum
    Amanda Nelson
    GEL 103
    Professor Lawler
  • 2. Content
    Background and Locations
    Bishop’s 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 Club’s website on the Nine Sisters of San Luis Obispo, Cal Poly resources, and online databases
  • 4. Bishop’s Peak
  • 5. Bishop’s Peak Geological History
    According to the Sierra Club San Luis Obispo and Gary Felsman(1)
    Bishop’s 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
    Bishop’s 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- Bishop’s 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 Encyclopædia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/149437/dacite
  • 8. Bishop’s Peak- Igneous Volcanic Rock- Dacite
  • 9. Bishop’s Peak- Igneous Volcanic Rock- Dacite
    Weather conditions has cut and widened cracks into gaps on their surfaces. (4)
    This makes the top of Bishop’s Peak appear like a montage of boulders.
    Bishop’s 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 history’s 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 Bishop’s 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 Encyclopædia 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- Bishop’s 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