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Updated: June 3, 2025
The next subdivision of the Upper Ludlow consists of grey calcareous sandstone, or very commonly a micaceous stone, decomposing into soft mud, and contains, besides the shells mentioned above, Lingula cornea, Orthis orbicularis, a round variety of O. elegantula, Modiolopsis platyphylla, Grammysia cingulata, all characteristic of the Upper Ludlow.
M. Bory, it is true, in the voyage of the sloop Amaranth, found in 1751, that the variation of the needle determined at the Cape was four degrees less than could have been conjectured from the observations made at the same period along the coasts. In the same manner as the granite of Galicia contains tin disseminated in its mass, that of Cape Finisterre probably contains micaceous iron.
Fragments of granite have been observed at Teneriffe; the island of Gomora, from the details furnished me by M. Broussonnet, contains a nucleus of micaceous schist: the quartz disseminated in the sand, which we found on the shore of Graciosa, is a different substance from the lavas and the trappean porphyries so intimately connected with volcanic productions.
The formations of Chiloe seem to extend with nearly the same character to Valdivia, and for some leagues northward of it: the underlying rocks are micaceous schists, and are covered up with sandstone and other sedimentary beds, including, as I was assured, in many places layers of lignite.
We unlimbered the creaky-legged cots, stiff and complaining after their three years' rest, and the air was filled with the clean odor of micaceous showers of naphthalene from long-packed pillows and sheets. From the rear came the clatter of plates, the scent of ripe papaws and bananas, mingled with the smell of the first fire in a new stove.
First, for the clay-slate formation: the slate is generally hard and bluish, with the laminae coated by minute micaceous scales; it alternates many times with a coarse-grained, greenish grauwacke, containing rounded fragments of quartz and bits of slate in a slightly calcareous basis.
"You did not mention yours, did you?" "Bostwick?" "They call me Ida May Bostwick," said Sheila, demurely smiling, and even then without a suspicion of the vortex into which she was being drawn. "Ida May Bostwick!" The visitor rose out of her seat as though a spring had been released under her. Her eyes flattened, distended, and sparked like micaceous rock in the dark.
In part it approaches in character to a green and blue roofing-slate, while part is extremely quartzose, the whole mass passing downward into micaceous schist. The vertical section here exhibited is about three feet in height, and the layers are sometimes so thin that fifty may be counted in the thickness of an inch. Some of them consist of pure quartz.
We killed five or six more deer and pigs before quitting Bisoleah on the following day, our road to Bechiacor leading us through the great forest, at this season perfectly healthy. We found our camp pitched in the broad dry bed of a mountain torrent, which I observed to be filled with fragments of granite and micaceous schist.
I had observed heaps of granite and micaceous stone at a much lower elevation in the course of the day before; and conclude that we were now on one of the highest inhabited points which occur in the interior of France. We had not leisure to walk to a telegraph on the right, which, to judge from the occasional glimpses which we had, must command a splendid map of the country near Autun.
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