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 131

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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 131

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[page]130.[/page] or basal margin gently curved passing insensibly into anterior margin which is slightly depressed just below the beaks. An obscure ridge passing downward and backward from the umbo to the posterior extremity. Surface marked by strong concentric, angular striae. Geol. Pos.-- Lower Coal Measures of Western States. [underlined][underlined][underlined]ANATINACEA.[/underlined][/underlined][/underlined] Marine bivalves with distinct siphonal orifices, one gill on each side and a pair of adductor muscles. The shell is thin and has a pearly lining. There may or may not be hinge teeth. The pallial line may be entire but is usually sinuous.