Letters on Geology; Being a Series of Communications Originally Addressed to Dr. John Locke, of Cincinnati, Giving an Outline of the Geology of the West and South West, Together with an Essay on the Erratic Rocks of North America,

Letters on Geology; Being a Series of Communications Originally Addressed to Dr. John Locke, of Cincinnati, Giving an Outline of the Geology of the West and South West, Together with an Essay on the Erratic Rocks of North America,

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1848 edition. Excerpt: ...or obscure. There are evidences of oblique striae from the umbilicus to the angular periphery, and a revolving undulation on the lower surface. The form of the shell is similar to Plcurotomaria (Raphistoma) lenticularis; but is a little more depressed on the summit, while the inner volutions are more rounded. Geological formation and locality. In strata associated with Goniatites oweni, G. rotatorius, etc.: Rockford, Indiana. EUOMPHALUS SPIRORBIS (n. 5.). SHELL extremely depressed, discoid: spire composed of three or four volutions which, on the upper side, are revolved in the same plane. Volutions slender, very gradually enlarging and not expanding at the aperture; aperture rounded: umbilicus Wideiand shallow, and sometimes with the outer edge subangular. Surface marked by strong elevated striae parallel to the lines of growth: strise sometimes crenulate. _ Geological formation and locality. In the same strata with the preceding species. MEGAMBONIA LYONI (n.s.). SHELL obliquely subovoid, broadly rounded in front and on the base, sloping posteriorly and rounded on the postero-basal margin: beak incurved and pointing forward. Surface marked by flattened radiating striae, which are sometimes dichotomized. The right valve shows two strong teeth just anterior to the beak, but the character of the hinge-line is not ascertained. I The shell has the form of Amsorrvcnm; being more robust than 11. carinata, and with finer radiating striaa, in this respect approaching.4. bellastria-ta. The presence of teeth in the hinge removes this fossil from EDMONDIA, to which genus I should otherwise have referred it.. Geological formation and locality. In the compact limestone of the Goniatite beds; at Rockford, Indiana. CYPRIGARDIA VENTRICOSA ( n. s.). SHELL...show more

Product details

  • Paperback
  • 189 x 246 x 8mm | 286g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123674599X
  • 9781236745996