Burity Palms.
At Camp Maria Alves we were at an elevation of 3,000 ft. Beautiful crystals were to be found at and near this place. Many were enclosed in hard envelopes of yellow lava, which contained besides semi-crystallized matter easily crushed—to be strictly accurate, the imprisoned infinitesimal crystals were easily separated, under gentle pressure. Some spherical balls and pellets of lava I picked up, when split contained red baked earth which had evidently been subjected to intense heat. In the centre of these pellets one or more crystals of great clearness were invariably to be found. These pellets must have been expelled with terrific force from a volcanic vent, and must have travelled great distances, for the depression where I found them had a surface of alluvial formation.
On April 13th we again rose over a range where we encountered a good deal of igneous rock and quantities of beautiful crystals. We had a range to the west of us and one higher and more important to the north-east, the latter more broken up than any we had so far seen in the three last provinces crossed. We somehow missed now the lovely pasture lands of the day before, so refreshing to the eye, and the landscape had suddenly become more rugged and barren, except near water. Some 9 kil. from the farm Maria Alves the Uru or Uruba River (elev. 2,550 ft.) flowed north—there merely a picturesque torrent among rocks and overhanging vegetation on both banks.
The wonderful effect of erosion was noticeable on the mountain sides to the north of us, where it had left a top terrace with deep corrugations in the lower sides of the mountain. A miserable-looking farmhouse could be seen here and there—quite as miserable as the country in itself was rich. Some shaggy policemen, in rags and barefooted, passed us, guarding an ox-cart dragging treasure to the capital. Only the oxen and some cows which were about looked at us with interest, and sniffed us—it is wonderful how quick animals are at detecting the presence of strangers—but the people took no notice of us. Here and there a tumbled-down tree blocked the way. There were tracts of pasture land. My men were considerably excited on seeing a poisonous snake crawl swiftly towards our mules. It was perhaps an absent-minded or a short-sighted snake, for no sooner did it realize our presence than it quickly veered round to escape. My men killed it.
At an elevation of 2,550 ft. we met a limpid stream of most delicious water. At that particular spot it flowed south.
We were now confronted with a range of actual mountains. The trail took us over wonderful rugged scenery, masses of pillar-like grey rock of granitic formation. On the summit of the pass we were over strata of half-solidified tufa in sheets—or foliated—easily crumbled and finely powdered between one's fingers. The strata were at an angle of 45°, showing that they had undergone some disturbance. They had been subjected to great heat, for in some places they had been hard baked, which rendered them of a yellowish brown colour. On the left of us—to the west—a great vertical pillar of rock plainly showed the stratification, the continuation of which could be followed on the opposite side of the pass, both in the horizontal strata and those which had been forced up at an angle. Looking back from the pass, we obtained a heavenly panorama of wooded hills to the south-east, far, far beyond in the background, and of glorious campos between them and us. With the winter coming on—of course you know that south of the equator they have their winter when we have our summer—beautiful yellowish, reddish and brown tints of the foliage added picturesqueness to the landscape.
The pass itself was 2,850 ft. above the sea level. There was not much in the way of vegetation, barring a few stunted sucupira trees. The air was exquisitely pure and the water of two streamlets at 2,550 ft. delicious and cool. We were marching over quantities of marble fragments and beautiful crystals, which shone like diamonds in the sun. Having gone over the pass, we came upon a most extraordinary geological surprise. There seemed to have been in ages long gone by a great subsidence of the region north of us. We were then on the steep edge of what remained of the plateau, and down, down in the depth below was an immense valley in which Goyaz city lay.
To the west of us—as I stood impressed by that awe-striking scene—we had the irregularly-cut continuation of the edge of the plateau on which we stood, supported as it were on a pillar-like granitic wall of immense height and quite vertical, resting on a gently sloping base down to the bottom of the vast basin below.
This great natural wall of gneiss, which contained myriads of crystals and mica schists, shone like silver in the spots where the sun struck it, and with the lovely pure cobalt blue of the distant hills, the deep green of the valley below, and the rich brown and yellow and red tints of the near foreground, made one of the most exquisitely beautiful sights I have ever witnessed. The nearest approach to it in my experience was, perhaps, the eastern escarpment of the Abyssinian plateau in Africa, where a similar panorama on a much smaller scale could be seen, but not the same geological formation.
