DIY History | Transcribe | Scholarship at Iowa | 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 32

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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 32

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is sometimes slightly depressed. Ventral valve slightly more convex than the dorsal valve; mesial sinus entire length of the valve, deeper in the front than posteriorly, often two lateral sinuses in the anterior region of the valve, these when present are shallow; beak extended, incurved. Surface undulating from side to side, marked marginally by lamellar of growth, no hinge area, shell extremely emarginate in front. A [narrowed?] foramen in beak of ventral valve. Geological position: Saint Louis limestone Localities: Pella, Eddyvilla, Iowa. References: Hall's Geology of Iowa;