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Corallines, now several feet above water, clothed the boulders. This, corroborated by a host of other phenomena, argues a secular upheaval of the island, and we find the same on the mainland. There were fragments of grey granite, but not in situ; all had been washed from the continent, where it outlies all other formations. Water-rolled bits of brickstone also appeared; and hence, probably, Dr.
We then bent eastward towards the Jibal el-Salbah, and examined the two dwarf valleys which, threading the heights, feed the Wady Dumayghah. That to the south showed us a perfectly familiar formation; conglomerates of water-rolled pebbles in the lower levels, and hills of the normal dark porphyries, with large quartz-seams of many colours trending in every direction.
For the last eighteen miles we had seen no quartz, which, however, might have veined the underground-rock. The sole of the Sirr now appeared spread with snow, streaked and patched with thin white paint; the stones were mostly water-rolled, the discharge of valleys draining from afar.
From the Col, reached at 9.45 a.m., a descent, vile for camels not for mules, presently landed us in the Wady Umm Amil. Crossing the torrent-gully we left on its right bank the ruins of large works, especially the upper parallelogram. After a thirteen miles' ride we halted at 10.40 a.m. under a rock on the left side, opposite three couthless heaps of water-rolled stones surrounded by fine quartz.
A steep descent over water-rolled pebbles showed the old bank; the other side, far and blue, gave a goodly breadth of five miles; then we plunged into the green selvage of the modern stream, following muddy paths where the inundation had extended last June. Here tobacco, orchilla, and indigo in the higher, and sugar-cane, rice, and ricinus on the lower lands flourish to perfection.
The alluvial detritus, which fills up the valleys to their present level, is formed by the diluvium of the hills: in parts these bottoms show strata, from one to three feet thick, of water-rolled pebbles bedded in clay. Here and there the couch must be a hundred feet deep, and the whole should be raised for washing by machinery.
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