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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 22

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50851 21 BRACHIOPODA ARTICULATA Protremata Strophomenidae Streptorhychus umbraculum, Schlotheim, 1820; Petrefactenkunde Plate III figure 9. Orthothetes umbraculum, Schlotheim [Aeuriphorites?], Externally resembling Derbya crassa (See page 73 and Plate VI figure), but somewhat larger. Differing from Derbya crassa internally by lacking the ventral septum. Geological location; Devonian to Permian. Specimen obtained from Saint Louis Limestone in the vicinity of Pella, Marion County Iowa.
 
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