Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: September 21, 2025
But I rather believe," he said, "that a lake in the immediate neighbourhood of the city furnished the quarry from which these stones were excavated; and, in half an hour, if you like, after you have finished your examinations of the temples with your guide, I will accompany you to the spot from which it is evident that large masses of the travertine, marmor tiburtinum, or calcareous tufa, have been raised."
The hills and rocks of Rome are all volcanic, and only the different varieties of eruptive rock were first employed for building purposes. The oldest monuments of the kingly period, such as the Cloaca Maxima, the Mamertine Prison, the Walls of Servius Tullius, and some of the earliest substructures on the Palatine Hill, were all built of the brown volcanic tufa found on or near their sites.
No doubt the venerable Christian sanctuary there has been frequently repaired and modified; on the terrace-level to the south can be seen the foundations of an earlier chapel, and the slopes are littered with broken bricks, Sorrentine tufa, and old battuto floors.
Primitive formations are nowhere seen above ground; we find only what belongs unquestionably to volcanoes: feldspar-lava, dolerite, basalt, conglomerated scoriae, tufa, and pumice-stone. Among the limestone formations we must distinguish those which are essentially subordinate to volcanic tufas* from those which appear to be the work of madrepores and other zoophytes.
However, of its relics we can only mention, in passing, the parish church with its four towers, all of tufa, the dungeons under the council-house, significantly called the "Jew's bath," and the old sixteenth-century contrivances for loading Rhine boats with the millstones in which the town still drives a fair trade.
The country beyond consisted of large patches of trap-covered tufa, having little soil or vegetation except tufts of grass and wait-a-bit thorns, in the midst of extensive sandy, grass-covered plains. These yellow-colored, grassy plains, with moretloa and mahatla bushes, form quite a characteristic feature of the country. The yellow or dun-color prevails during a great part of the year.
These underground dwellings, burrowed out like rabbits' warrens, with earth floors, no ventilation except a chimney cut in the tufa roof to let the smoke out, and only the one window and door in the front to admit light and air, seem utterly cheerless and uncomfortable, despite our chauffeur's assurances that they have many advantages.
In later times, as the catacombs were extended, the tufa dug out from one passage was carried into the old passages no longer used; and thus, as the catacomb extended in one direction, it was closed up in another, and the ancient graves were concealed.
A serious study of the soil was necessary to negative or confirm my hypothesis. I took in every item of what I saw, and I began to comprehend the succession of phenomena which had preceded its formation. Iceland, being absolutely without sedimentary soil, is composed exclusively of volcanic tufa; that is to say, of an agglomeration of stones and of rocks of a porous texture.
The mountain is composed of trachytic rocks and tufa, which are occasionally seen to break through the rich and deep soil, showing themselves here and there, in the deep valleys which former volcanic action has created, and which have destroyed the regular outline of the cone-shaped mountain.
Word Of The Day
Others Looking