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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 44

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[page]43.[/page] idly increasing from the center outward. Surface marked by septal furrows which appear as fine longitudinal striae ending in a helicoidal curve at the extremities of the test. Aperture or mouth linear visible to naked eye. Geol. Pos. and Localities.-- Missouri stage of coal measures in Montgomery and Madison counties in Iowa. Reference.-- Final Report, U.S. Geol. Sur. of Nebraska. [underlined][underlined][underlined][underlined][underlined]COELENTERATA[/underlined][/underlined][/underlined][/underlined][/underlined] Included in this sub-kingdom are marine organisms which may be free or attached. They are more than one celled, extremely variable in form, and are more or less radially
 
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