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Near by are quarries of Breccia marble a conglomerate of cemented variegated pebbles out of which were cut the rich pillars in the House of Representatives at Washington. The Monocacy is crossed, near whose bank lies the bucolic old Maryland town of Frederick, to attain which a twig of the road wanders off for the few necessary miles.
The occurrence here and there of bones in a very perfect state, or of several bones belonging to the same skeleton in natural juxtaposition, and having all their most delicate apophyses uninjured, while many accompanying bones in the same breccia were rolled, broken, or decayed, was accounted for by supposing that portions of carcasses were sometimes floated in during floods while still clothed with their flesh.
Every variety of trap-rock is sometimes found in dikes, as basalt, greenstone, feldspar-porphyry, and trachyte. The amygdaloidal traps also occur, though more rarely, and even tuff and breccia, for the materials of these last may be washed down into open fissures at the bottom of the sea, or during eruption on the land may be showered into them from the air.
Commencing near the beach on the west, they continue in an easterly direction over the hill, forming the limits of the present town. Near the gateway they are upwards of twenty feet high, and form the foundation of the Agha's konak; a small mosque has also been raised upon the ruins of a square tower; the blocks of stone, a dark green volcanic breccia, are of gigantic size."
The discovery of the existence of this suite of caverns near the sea at Brixham was made accidentally by the roof of one of them being broken through in quarrying. None of the four external openings now exposed to view in steep cliffs or in the sloping side of a valley were visible before the breccia and earthy matter which blocked them up were removed during the late exploration.
Below this were strata of trachitic breccia and augite; the formation was then seamy to an unknown depth. Within the reef, the surface soil was red, and of a sandy nature. The next stratum was of a loose, yellow, gravelly lime, and the third blue, of a hard, slaty nature. This last was the real diamantiferous soil.
The fragments retain their annular shape, and, at some points on the coast, they become cemented together by lime or other binding substances held in solution or mechanical suspension in the sea-water, and are so rapidly converted into a singularly heterogeneous conglomerate, that one deposit seems to be consolidated into a breccia before the next winter's torrents cover it with another.
The rock consisted of a calcareous breccia, with water-worn pebbles. The carts had ascended to the crest without difficulty, and the descent to the country beyond was equally favourable. Halfway down, the dogs killed a female kangaroo, with a nearly full-grown young one, which she retained to the last, within her pouch.
These subterranean vaults are usually filled in part with mud, pebbles, and breccia, in which bones occur belonging to the same assemblage of animals as those characterising the Post-pliocene alluvia above described.
Its western extremity is opposite to a range of islands connected by bridges, and so close together that they might be taken for another neck of land. These islands are all composed of a calcareous breccia of extremely recent formation, and analagous to that on the coast of Cumana, and near the castle of Araya.
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