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The strata consist chiefly of red calcareous sandstones, with numerous veins in the place of layers, of gypsum; the sandstone is associated with some black calcareous slate-rock, and with green pseudo-honestones, passing into porcelain-jasper.
Farther up they came on the flat juniper and crossed a wet ground-thicket of whortleberry: their feet were in the moist moss among sprigs of heath; and a great fir-tree stretched his length, a peeled multitude of his dead fellows leaned and stood upright in the midst of scattered fire-stained members, and through their skeleton limbs the sheer precipice of slate-rock of the bulk across the chasm, nursery of hawk and eagle; wore a thin blue tinge, the sign of warmer light abroad.
The eruptions of this volcano appear to have displaced the mud of the Lummerfeld, causing it to flow down into the deep gorge of the Brühl, which it completely filled, as stated above. On walking down the valley one may sometimes see the junction of the tuff with the slate-rock which enfolds it.
In proof of this he showed experimentally that a mass of "pure white wax, after having been submitted to great pressure, exhibited a cleavage more clean than that of any slate-rock, splitting into laminae of surpassing tenuity."
This formation consists of thin strata, with innumerable alternations, of black, calcareous slate-rock, of calcareo-aluminous stones like those at Coquimbo, which I have called pseudo-honestones of green jaspery layers, and of pale-purplish, calcareous, soft rotten-stone, including seams and veins of gypsum.
Nicholas, that one gets the finest view of Angers, the colossal mass of its castle, the two delicate towers of the Cathedral rising sharp against the sky, the stern belfry of St. Aubin. Angers stands in fact on a huge block of slate-rock, thrown forward from one of the higher plateaux which edge the marshy meadows, and closing up to the river in what was once a cliff as abrupt as that of Le Mans.
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