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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 51

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50. Academy of Sciences, page 115. Corallum turbinate but extremely irregular, contorted. Surface marked by undulations of growth and by rootlets. Outer portion of a calyx flattened into a flange-like expansion, center moderately deep, with flattened columella. Principal septs twenty to thirty with minor septs intercalated. Geol. Pos. -- Upper Coal Measures. Localities -- Adair, Guthrie, Madison, Pottawatamie, and Ringgold Counties in Iowa. Reference: -- Travis. Chicago Acad. of Sciences, Vol. I. page 115. ---------- o ---------- [underlined]HEXACORALLA[/underlined] "Simple or composite corals, with radial mesenterics arising in cycles of six, twelve or multiples of six; frequently with calcareous corallum, but sometimes fleshy or with horny axis.
 
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