ROSS CREEK, GRUETLI LAAGER, TENNESSEE |
GRUETLI LAGER HISTORIC SIGN Brian Stansberry Photograph |
Gruetli Laager is located on or near the Cumberland Plateau (part of the greater Appalachian Plateau). The bedrock in that area is a thick section of Mississippian limestones capped by Pennsylvanian deltaic and braided river sandstones, including significant coal deposits. Your Quaternary sand grains are a mix of the Pennsylvanian sandstone (the brownish grains; brown from significant Feox-staining and liesegang banding in the sandstone) and greyish Mississippian limestones, maybe from the Ft Payne Formation, which is present at the bottom of the plateau right as you start to climb up onto it. The typical fossils you see in the limestones around there are crinoids, brachiopods, and bryozoa. I can't remember if there is oolitic LS in the section there, but perhaps in the unit above the Ft Payne (Bangor LS or, moving upsection, Monteagle LS or, moving upsection, possibly thin LS interbeds in the Raccoon Mtn Fm). Either way, the sand you collected samples ≤300 m of stratigraphy in the Mississippian-Pennsylvanian section.
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GRAIN DISTRIBUTION CHARACTERISTICS (AGI CHART) |
International Space Station 370mm 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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