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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 144

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[page]143.[/page] to five, the last one occupying about one-half the height of the shell; periphery of volutions bears a prominent ridge upon which are two smaller ridges; suture marked by a rather prominent nodulose revolving band; aperture not known; umbilicus closed by columella. Surface marked by revolving nodulose striae. Height of shell slightly more than one fourth inch breadth about three eighths of an inch. Geol. Pos.-- Upper Coal Measures. [underlined][underlined]Capulidae.[/underlined][/underlined] In this family the shell is patelliform, and more or less spiral, the interior is simple, or divided by a shelly process which furnishes attachment for the adductor muscle. Margin of aperture thin and
 
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