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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 68

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[page]67.[/page] shaped colonies. Each member of teh colony is enclosed in a membraneous or calcareous sac. These are usually hermaphrodite animals. [underlined][underlined][underlined]CPYPTOSTOMATA[/underlined][/underlined][/underlined] "In the mature colony the aperture is concealed, occurring at the bottom of a tubular shaft ("vestibule"), which may be intersected by straight diaphragms or hemisepta, owing to the direct super-imposition of layers of polyphides." [underlined][underlined]Rhabdomesodontidae.[/underlined][/underlined] [underlined]Rhombopora lepidodendroides.[/underlined] Plate V. figure 3. Meek, 1871: Rept. on Paleontology of Eastern Nebraska See Final Rept. U.S. Geol. Survey of Nebraska, page 141. Zoaria slender, bifurcating at regular intervals, divisions nearly straight between points of division,
 
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