JACUMBA ALLUVIUM, CALIFORNIA |
ALLUVIAL DEPOSIT, JACUMBA - Gary Foster Photograph |
I have always had an interest in Alluvial Fans (and long roll-out rock falls, much more rare - there's one in British Columbia). l saw these micro fans while stretching my legs at Jacumba, CA on I-8 on way back to Phoenix . I looked at them in depth and of course realized what I was seeing was a mini-micro-example of what I see throughout AZ on a much larger scale (many times larger) at the base of mountains. I pretended I was at 100,000 feet looking down on the Nile Delta. It looks the same. I read this description of AFs on Google which matches exactly (Exactly!!) what I saw on a micro level:
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GRAIN DISTRIBUTION CHARACTERISTICS (AGI CHART) |
International Space Station 800mm Photograph Image credit: Image Science and Analysis Laboratory, NASA Johnson Space Center | GRAIN SHAPE CHARACTERISTICS(PREPARED BY GAMMA ZETA CHAPTER , SIGMA GAMMA EPSILON, KENT STATE UNIVERSITY - AGI CHART))Roundness is the degree of smoothing due to abrasion of sedimentary particles. It is expressed as the ratio of the average radius of curvature of the edges or corners to the radius of curvature of the maximum inscribed sphere.The sphericity of a particle is: the ratio of the surface area of a sphere (with the same volume as the given particle) to the surface area of the particle. |
SMALL ALLUVIAL FAN |
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LARGE ALLUVIAL FAN |
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FEBRUARY 2023 SAMPLE |
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