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 121

Transcribe
Translate

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 121

[page]120[/page]

[underlined]Myalina subquadrata[/underlined], Shunard, 1855, Geol. Rept., Missouri Survey, p.207.

     Plate IX. figure 3.

     Shell large and thick, subquadrate, height one and three-fourths to two times the antero-posterior dimensions; right valve nearly or quite flat; left valve convex, compressed in superior posterior portion. Hinge line almost or quite straight and but little less than greatest length of shell, posterior margin vertical, almost straight, rounding into posterior-superior and basal margins; basal margin regularly curved; anterior margin nearly straight rounding into basal margin, and projecting forward into beak at its uppper end. Beaks are most anterior parts of shell, are directed forward. Cardinal area rather broad, with several furrows. Surface of

Saving...

[page]120[/page] [underlined]Myalina subquadrata[/underlined], Shunard, 1855, Geol. Rept., Missouri Survey, p.207. Plate IX. figure 3. Shell large and thick, subquadrate, height one and three-fourths to two times the antero-posterior dimensions; right valve nearly or quite flat; left valve convex, compressed in superior posterior portion. Hinge line almost or quite straight and but little less than greatest length of shell, posterior margin vertical, almost straight, rounding into posterior-superior and basal margins; basal margin regularly curved; anterior margin nearly straight rounding into basal margin, and projecting forward into beak at its uppper end. Beaks are most anterior parts of shell, are directed forward. Cardinal area rather broad, with several furrows. Surface of