Lab and field raul calderon
- 1. Lab/Field Assignment California Central Coast BY RAUL CALDERON GEL103 LAKE TAHOE COMMUNITY COLLEGE
- 2. INTRODUCTION: The nature of evolution is something that we as humans strive to learn more about. California has an abundance of geological history and species’ of plants and animals that have evolved through time. In this presentation I will be presenting what have analyzed and documented during my trip to California’s Central Coast.
- 3. California Central Coast Region The Central Coast region extends from Santa Cruz County south along Monterey Bay and the isolated Big Sur coast in Monterey County, to Morro Bay and Avila in southern San Luis Obispo County. (caseagrant,2018)
- 4. Central Coast Salinas Rivers • The Salinas river is currently held by tectonic plate theory. (Lloyd,1982) • It is also thought to have drained prehistoric Lake Corcoran, which once occupied much of what is now California's Central Valley about 700,000 years ago. • (Martin, 1999)
- 5. The Western Gull (Larus occidentalis) • The Western Gull is a bird species • It is theorized that all birds evolved from Theropod Dinosaurs • Theropod fossils show unique features similar to modern day birds • The ancestor of all living birds lived sometime in the Late Cretaceous, and in the 65 million years since the extinction of the rest of the dinosaurs, this ancestral lineage diversified into the major groups of birds alive today.
- 6. Central Coast Mountain Range • The Southern Coast Ranges are mainly composed of Sedimentary rocks • in The Central Coast of California, Tectonic forces and volcanism form the landscape • Much of the continental crust that is now California was derived or recycled from crust that originally formed beneath the Pacific Ocean as ocean crust. (Geologycafe,2018) • By late Miocene time, the shoreline geometry of southern California changed significantly as mountain ranges began to rise along the coastline (Geologycafe,2018)
- 7. Central Coast Rocks The general classification for this rock is sedimentary It is a mudstone rock, it is formed from the seafloor mud. its is very light weight and is has a sandy texture The general classification for this rock is sedimentary It is a Siltstone rock This rock is also very light weight and has a sandy texture However, this rock is rich in quartz silt particles The general classification for this rock is Igneous It is an Rhyolite which is a rounded stream boulder This rock has a smooth texture with dents and holes imbedded into its surface. This rock is very dense and feel heavy.
- 8. Law of Original Horizontality • The sequence of sedimentary rock layers that are steeply inclined from the horizontal must have been tilted after deposition and lithification (Monroe, J. S., & Wicander, R. 2015) • The law states that layers of sediment were originally deposited horizontally under the action of gravity
- 9. Angular Unconformity • The strata below the conformable surface dip more steeply than those above it, which could be seen here as it is creating an angular rock. (Monroe, J. S., & Wicander, R. 2015) • Angular Unconformities are those where an older package of sediments has been tilted, truncated by erosion, and than a younger package of sediments was deposited on this erosion surface. • This Image shows erosion which removes uplifted mountain range
- 10. References: California Lakes, Rivers and Water Resources. (n.d.). Retrieved from https://geology.com/lakes-rivers- water/california.shtml Central Coast. (n.d.). Retrieved from https://caseagrant.ucsd.edu/project/discover-california-commercial- fisheries/regions/central-coast Salinas River (California). (2018, July 29). Retrieved from https://en.wikipedia.org/wiki/Salinas_River_(California) Western Gull Overview, All About Birds, Cornell Lab of Ornithology. (n.d.). Retrieved from https://www.allaboutbirds.org/guide/Western_Gull/overview The origin of birds. (n.d.). Retrieved from https://evolution.berkeley.edu/evolibrary/article/evograms_06 Geology Cafe. (n.d.). Retrieved from http://geologycafe.com/ Monroe, J. S., & Wicander, R. (2015). The changing earth: Exploring geology and evolution. Stamford, CT: Cengage Learning. Law of Horizontality in Sediments Sedimentary Rock Processes. (n.d.). Retrieved from http://geology.isu.edu/Alamo/rocks/law_horizontality.php