The Geologist Volume 3

The Geologist Volume 3

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1860 edition. Excerpt: ..."Ell coal," and from which locality it has been known to a friend in Carluke for upwards of thirty years.f My attention was, however, first directed to the shell by Mr. Young, who had been struck by its peculiar triangular appearance, and it was subsequently discovered at Robroyston, north of Glasgow, in beds upon a similar horizon to that of Gare, while the largest examples were procured by Dr. Sliinon, from Hall Hill, Auchenheath, and Coalburn, Lesmahago, about three hundred fathoms below "Ell coal. I possess also an American Lingnla from the Pottsdam sandstone of the Falls of St. Croix, Minnesota, which is stated by Mr. Worthen to be the oldest known American spjeics of the genua. In shape it is very similar to L. Scotica, but differs from it in sculpture as well as in the convexity of its valves. t This shell has been known for many years in Scotland as a Posidonomya, but of which genus it does not possess the character. voL. III. 2 G XLVIII.--Lingula Mttiloides. Sowerby. PI. v., figs. 38-43. Lingula mytiloides. Sowerby, "Min. Con.," tab. xix., fig. 1-2,1813, = Lingula ellipiica and = L. parallela, Phillips' "Geology of Yorkshire," vol. ii., plate xi., figs. 11-15 and 17-19, 1836. This shell appears to vary in shape, but is usually more or less regularly elliptical or ovate, with its greatest width either towards the posterior or anterior extremity. Its sides are also sometimes nearly parallel and rounded in front, but both front and beaks are in other examples about equally and regularly elliptically attenuated. The valves are generally convex," and most elevated along the middle, where there exists likewise a flatness, which becomes gradually wider as it extends from the apex of the beak to the front, ...
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Product details

  • Paperback | 222 pages
  • 189 x 246 x 12mm | 404g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236586247
  • 9781236586247