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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 49

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48. 1852: Rept. Geol. Sur. of Wisconsin, Iowa, and Minnesota. Pl IV., fig 2. Referred to genus Campophyllum by F. B. Meek in 1871. See Rept. on the Pal. Rocks of E. Nebraska. Plate IV. figure 2. Corallum large, simple, elongated, subconical, often bent abruptly within a few inches of the apex, but in large specimens, becoming straight and cylindrical farther out. Calyx circular, moderately deep, descending abruptly, then flatter for a short space, and again abruptly into a well defined central depression. Septal fossette formed by the omission of the axial portion of three of the principal septa. Septa thirty to fifty extending about one half to two thirds of the distance to the center; rudimentary septa alternating
 
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