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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 27

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26. well defined, marked by two or three plications, beak somewhat extended with foramen in its extremity. Surface marked near the front and lateral margins by short plications and by laurellose lines of growth; smooth in the umboral region. Geological position: Saint Louis Stage Localities: Fort Dodge, Pella, Eddyville, Pella, Ottumwa, and other places in Iowa Reference: Geology of Missouri, Vol.V. Terebratulidae Terebratula turgida. Plate III. figure 4. Terebratula turgida, Hall. Trans. Alb. Inst., Vol. IV., p. 6. 1856.
 
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