Browsing Reports of Progress - Indiana Geol. Survey by Subject "Petrography"

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  • Pickering, Ranard J. (Indiana Geological Survey, 1953)
    The bituminous coals of Indiana show a characteristic bright and dull banding which is due to alternating bands of five distinct physical constituents, namely, vitrain, clarain, durain, fusain, and mineral matter. A ...

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