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Bernard is much more severe than on any other part of the road. The end of the convent, overhanging the northern brow of the gorge, and looking like a mass of that ferruginous and melancholy rock which gave the whole region so wild and so unearthly an aspect, soon became visible, carved and moulded into the shape of a rude human habitation.
Viewed from below, the base rests upon cliffs of gneiss, with debris and quartz in masses, bands and pebbles, pure and impure, white and rusty. Upon it rises a stratum of ferruginous clay, with large hard-heads of granite, gneiss, and schist, blocks of conglomerate, and nodules of ironstone. Higher still is the bank of yellow clay, capped with shallow humus.
The soil contains sufficient ferruginous matter, to impart a red tinge to nearly the whole of it. It is supplied with a great number of little flowing streams which unite in the Lucalla. This river drains Ambaca, then falls into the Coanza to the southwest at Massangano.
When worms were kept in pots filled with fine ferruginous sand, it was manifest that the oxide of iron, with which the grains of silex were coated, had been dissolved and removed from them in the castings.
This band of symmetrically troubled country is about eight miles in width. The island of Quiriquina, in the Bay of Concepcion, is formed of various soft and often ferruginous sandstones, with bands of pebbles, and with the lower strata sometimes passing into a conglomerate resting on the underlying metamorphic schists.
At eighty miles from the coast, in a cliff thus composed, there were a few layers of ferruginous sandstone, and of an argillaceous sandstone with concretions of marl like those in the Pampas. The strata generally dipped at an angle of 45 degrees towards the cliff from which they had slided. I have observed in slips, both on a small and large scale, that this inward dip is very general.
We may sometimes observe, where the water of ferruginous or calcareous springs has flowed through a bed of sand or gravel, that iron or carbonate of lime has been deposited in the interstices between the grains or pebbles, so that in certain places the whole has been bound together into a stone, the same set of strata remaining in other parts loose and incoherent.
The lowest bed is a sandstone with ferruginous veins; it weathers into an extraordinary honeycombed mass; above it there is a dark-coloured argillaceous shale; above this a coarser sandstone making a total thickness of about sixty feet; and lastly, above these sedimentary beds, there is a fine conformable mass of greenstone, in some parts having a columnar structure.
Then they cut across the fields, over the reddish-brown ferruginous soil, careering madly on and on; and there was a sky of molten lead above them, not a shadow anywhere, nothing but dwarf olive trees and almond trees with scanty foliage.
Below Sinamane's the banks are often worn down fifty feet, and composed of shingle and gravel of igneous rocks, sometimes set in a ferruginous matrix. The bottom is all gravel and shingle, how formed we cannot imagine, unless in pot-holes in the deep fissure above. The bottom above the Falls, save a few rocks close by them, is generally sandy or of soft tufa.
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