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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 48

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[page]47[/page] principal septa twenty to twenty-six alternating with minor septa Epitheca thin, with moderately well defined, annular undulations and striae of growth; surface also marked by septal striae. Size of fossil one half inch to one inch in length, three sixteenths to three eighths inch in largest diameter. Geol. Pos. -- Coal Measures. Localities,-- Montgomery Co. Iowa; also in Illinois and Nebraska. Reference,-- Tinal Rept. U.S. Geol. Sur. of Nebraska. [underline][underline]Cyathophyllidae[/underline][/underline] Coralla simple or in colinies. Septa abundant. Both tabular and disseptiments numerous. [underline]Campophyllum torquium[/underline] Cysthophyllum torquium, Owen,
 
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