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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 31

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30 Iowa localities.- Lee, Jefferson, Wapello, Mahaska, Marion, Webster, and some other counties. References.- Hall's Geology of Iowa, Vol.I., pt.II., Geology of Missouri, Vol.V., pt.II. Athyridae Athyris (Seminula) subquadrata, Hall. Hall's Geology of Iowa, Vol.I. pt.II. 1858. Plate III figure 6 Shell double convex, subquadrate with the diagonals along the length and breadth of the shell, slightly longer than broad, with some exceptions. Dorsal valve divided into three lobes or folds, the middle or mesial fold being the most prominent. The folds are separated by two depressions which become obliterated posteriorly thus joining the folds to form the umbo. The crest of the mesial fold
 
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