The South-West

The South-West

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Excerpt: ...this species of stone, whose basis is clay, is found in a more matured state of petrifaction. Perfect gravel is seldom met with here, even in the stratum of pebbles before mentioned. These resemble in properties and colour, the clay so abundant in this region; a great proportion of the gravel is composed of a petrifaction of clay and minute shells, of the mollusca tribe. Pg 156 I have found in the dry bed of the St. Catharine's, pebbles, entirely composed of thousands of the most delicately formed shells, some of which, of singularly beautiful figures, I have not before met with. Concave spiral cones, the regular discoid volute, cylinders, a circular shell, a tenth of an inch in diameter, formed by several concentric circles, and a delicate shell formed by spiral whorls, with fragments of various other minute shells, principally compose them. The variety of shells in this state is very limited. All that have been found here have their surfaces covered with the smooth olive-green epidermis, characteristic of fresh water shells, and are all very much eroded. Agates of singular beauty have also been discovered, and minute quartz crystals are found imbedded in the cavities of pebbles composed of alumina and grains of quartz. Mica and feldspar I have not met with. About two years ago, on the plantation of Robert Field, Esq. in the vicinity of the white cliffs, a gentleman picked up from the ground a large colourless rock crystal, with six sided prisms and a pyramidal termination of three faces. Curiosity led him to examine the spot, and after digging a few minutes beneath the surface, he found three more, of different sizes, two of them nearly perfect crystals, but the third was an irregular mass of colourless transparent quartz. This is the only instance of the discovery of this mineral in the state, and how these came to be on that spot, which is entirely argillaceous and at a great distance from any rocks or pebbles, is a problem. Pure flint is not...show more

Product details

  • Paperback | 78 pages
  • 189 x 246 x 4mm | 154g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236736729
  • 9781236736727