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Assessing How Rock Type Controls the Concentration of Incising Bedrock Gullies In the Gabilan Mesa
Miguel FriasFaculty Advisor: George Hilley, Ph.D.
Mentor: Sam JohnstoneDepartment of Geological and Earth Sciences
Stanford University
SURGE Symposium – Aug. 13th, 2015
What controls the sensitivity of landscapes?
What controls the sensitivity of landscapes?
What controls the sensitivity of landscapes?
What controls the sensitivity of landscapes?
Gabilan Mesa primarily mud-rich rocks
Majority of area underlain by the Pancho Rico Formation
• Shallow marine• Mud rich
Formation Rock Type
Paso Robles -Conglomerate-Strong, well
cemented
Pancho Rico -Mud Clay Rich-Marine
Gabilan Mesa
6Introduction Objective Hypothesis Methods/Results Conclusion
Introduction Interest Hypothesis Methods/Results Conclusion
Slaking of core samples after one wetting and drying cycle
Before After
Gullies formed from headward retreat
9Introduction Interest Hypothesis Methods/Results Conclusion
Why are we interested?
• How do landscapes respond to changing climatic and tectonic conditions?
• Are landscapes over mud rich rock more vulnerable to erosion than other regions?
10Introduction Objective Hypothesis Methods/Results Conclusion
Are gullies more concentrated in mudstones than sandstones and conglomerates?
Introduction Objective Hypothesis ConclusionMethods/Results
Concentration of gullies within Gabilan Mesa is highly variable
12Introduction Objective Hypothesis Methods/Results Conclusion
Gullies are more frequent in Pancho Rico than Paso Robles
13Introduction Objective Hypothesis Methods/Results Conclusion
14Introduction Objective Hypothesis Methods/Results Conclusion
Is a basin more Pancho Rico or more Paso Robles?
15Introduction Objective Hypothesis Methods/Results Conclusion
Is a basin more Pancho Rico or more Paso Robles?
16Introduction Objective Hypothesis Methods/Results Conclusion
Is a basin more Pancho Rico or more Paso Robles?
Gullies are more frequent in Pancho Rico than Paso Robles
17Introduction Objective Hypothesis Methods/Results Conclusion
Deformation of Paso Robles can possibly provide information about relative uplift
18Introduction Objective Hypothesis Methods/Results Conclusion
Conclusion
Introduction Objective Hypothesis Methods/Results
• Rock type controls the density of gullies in the Gabilan Mesa
• Gully density within Pancho Rico formation much more variable than the Paso Robles
• Deformation of the local bedrock can provide information about relative uplift but need to reconsidered some of the mapped gullies
Conclusion
Acknowledgements
• Dr. George Hilley • Sam Johnstone• SURGE Program• Stanford University
Questions?