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Updated: June 3, 2025
This rage for the search of mines strikes us the more in a climate where the ground needs only to be slightly raked to produce abundant harvests. After visiting the pyritous marls of the Rio Juagua, we continued following the course of the crevice, which stretches along like a narrow canal overshadowed by very lofty trees.
The marls, as the smell indicates, are pyritous and bituminous at the same time; and the petroleum springs at the Buen Pastor, and in the island of Trinidad, proceed probably from these same beds of alpine limestone.
The tree also grows well in loams and the richer marls, but will not thrive on clay and other heavy soils.
Also in the purple marls of Corncockle Muir near Dumfries, very distinct footprints of reptiles occur, originally referred to the Trias, but shown by Mr. Binney in 1856 to be Permian. No bones of the animals which they represent have yet been discovered.
The gypsum, with its associated marls before described, is in greatest force towards the centre of the basin, where the calcaire grossier and calcaire silicieux are less fully developed. In some parts of the Paris basin, sands and marls, called the Gres de Beauchamp, or Sables moyens, divide the gypseous beds from the calcaire grossier proper.
Below this other strata occur with fish, tortoises, the great salamander before alluded to, fresh-water mussels, and plants. In No. 16 the fossil fox of Oeningen, galecynus Oeningensis, Owen, was obtained by Sir R. Murchison. In the 19th bed are numerous fish, insects, and plants, below which are marls of a blue indigo colour.
To these conglomerates succeed argillaceous and calcareous marls and limestones, containing Lower Miocene shells and bones of mammalia, the higher beds of which sometimes alternate with volcanic tuff of contemporaneous origin.
Marls, shales, and sandstones, of all tints, were strewn and piled into a variegated vista of sterile splendor. Here surely enchantment and glamour had made undisputed abode. All day the wounded and the women reposed, gazing a good deal, but sleeping more. During the afternoon, however, our wonder-loving Mrs.
Maggie's heart sank a little, because Tom always said it was "no good" playing with her at those games, she played so badly. "Marls! no; I've swopped all my marls with the little fellows, and cobnuts are no fun, you silly, only when the nuts are green. But see here!" He drew something half out of his right-hand pocket. "What is it?" said Maggie, in a whisper.
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