Scanning Electron Microscope observations were made on sand-size mica flakes from a wide variety of sedimentary environments ranging from source area soil profiles to the deep sea. Sharp differences were observed in surface textures (especially mechanical scratches), the types and extent of biological degradation, grain roundness, and "book" thickness. These qualitatively observed differences between sedimentary environments are sufficient to suggest that detrital mica flakes may be useful for paleoenvironmental determinations.

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