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GRAIN DISTRIBUTION CHARACTERISTICS (AGI CHART) |
International Space Station 400mm 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. |
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FOSSILS |
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I had never seen the fossils shown in the image to the right. I assumed they were some sort of remnant from an invertebrate. My guess was sponge spicules. I posted the images to the AGS site, and asked for their help in identifying the critters. The results included Echinoderm Spines from some unknow critter, Brachiopod Spines (see blog post),and Trilobite Spines. The question is still open!
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