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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 7

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remains are for the most part crystalline. in no other geological region is there to be found such a variety of species and such an innumerable quantity of individuals of crinoids as in the Augusta. Indeed this age seems to have been the culminating time for this form of life. Crinoids may be found in the strata of all ages from the Ordovician to the present, but nowhere else in such abundance as in the Augusta. The crimoids of the lower Burlington are small and delicately constructed and ornamented. In the upper Burlington this delicacy has been lost and the ornamentation and construction have assumed a rude character while in the Keokuk the crimoidal re
 
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