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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 64

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[page]63.[/page] that the top of the calyx appears nearly level. First anal plate quadrangular about one half as large as a sub-radial, resting upon upper sloping edges of two sub-radials, and between a first radial and the second anal plate. Second anal plate not so large as first, pentagonal in form, projecting above top of calyx, bordered by first anal, one sub-radial, two first-radials, and above by two smaller anal plates. Surface marked by verrucose elevations. Geol. Pos. and Loc.-- Upper Coal Measures of Nebraska. Ref.-- Final Rept. U. S. Geol. Sur. Nebraska, p. 150.
 
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