From the appearance of the high-water mark
upon the rock, it was easy to ascertain the approximate depth
when the flood was at its maximum. We pitched our camp on the
slope above the basin, and for several days I explored the bed of
the river, which was exceedingly interesting at this dry season,
when all the secrets of its depths were exposed. In many places,
the rocks that choked its bed for a depth of thirty and forty
feet in the narrow passes, had been worked into caverns by the
constant attrition of the rolling pebbles. In one portion of the
river, the bottom was almost smooth, as though it had been paved
with flagstones; this was formed by a calcareous sediment from
the water, which had hardened into stone; in some places this
natural pavement had been broken up into large slabs by the force
of the current, where it had been undermined. This cement
appeared to be the same that had formed the banks of
conglomerate, which in some places walled in the river for a
depth of ten or fifteen feet, with a concrete of rounded pebbles
of all sizes from a nutmeg to a thirty-two pound shot.
I fired the grass on the west bank of the Royan, and the blaze
extended with such rapidity, that in a few hours many miles of
country were entirely cleared.
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