Figure 4-5. Layer of microcrystalline CaCO3 in a flowstone from an unnamed cave intersected by highway construction near Carthage, Tennessee, U.S.A. Note abundance of larger detrital grains (two of which are marked with red arrows). Photomicrograph was taken in plane-polarized light; field of view is 2.4 mm wide. Carthage, Tenessee, U.S.A.; Stalagmite MR68; thin section MR68. Sample collected from highway construction debris by L. Bruce Railsback. |
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