Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 8, 2025
From Tanatepec we were in Chiapas, the southernmost state of the republic. We struck out over a fine mountain road, passable for carts all the way to Tuxtla Gutierrez, the capital of the state. Our first ascent was over a magnificent mountain mass of syenite, which at some places seemed to be as fine as our own Quincy stone.
Above the Ghauts a plateau of primitive rocks mixed with sandstone, granite, syenite, mica schiste, quartz rock, micaceous grit, &c.
Agassiz was delighted, and entertained them with a brief lecture on primeval rocks and the crust of the earth's surface. He told them that Boylston Hall was made of syenite; that most of the stone called granite in New England was syenite, and if they wanted to see genuine granite they should go to the tops of the White Mountains. Then looking at his watch he said: "Ah, I see I am late!
Often, where the water flows over beds of dark grey basalt, masses of trachyte, closely resembling syenite, have formed "potholes," and by mutual action have been worn to pebbles. At Pei-pei there are three circular pools, each about fifty feet in diameter, and separated by walls six feet thick, in a bed of columnar basalt.
Huge boulders of chalk are in fact included in the clay, and have evidently been brought to the position they now occupy by the same agency as that which has planted blocks of syenite from Norway side by side with them.... Thus there is a writing upon the wall of cliffs at Cromer, and whoso runs may read it.
Since this massive granite was the coffin of Hapimen, it has been known to the Turks as the "Lover's Fountain," and used by them as a cistern. The Syenite sarcophagus of a standard-bearer, is marked 18. The chest of a royal sarcophagus that was taken from the mosque of St. Athanasius at Alexandria, and which contained the mummy of a king of the twenty-eighth dynasty, is marked number 10.
Northward of Las Minas, the more regular northerly ranges predominate: from this place to near Polanco, we meet with the coarse-grained mixture of quartz and feldspar, often with the imperfect hornblende, and then becoming foliated in a N. and S. line with imperfect clay-slate, including laminae of red crystallised feldspar with white or black marble, sometimes containing asbestus and crystals of gypsum with quartz-rock with syenite and lastly, with much granite.
Ordinary granite, as well as syenite and eurite, usually contains two kinds of feldspar: First, the common, or orthoclase, in which potash is the prevailing alkali, and this generally occurs in large crystals of a white or flesh colour; and secondly, feldspar in smaller crystals, in which soda predominates, usually of a dead white or spotted, and striated like albite, but not the same in composition.
Huge boulders of chalk are, in fact, included in the clay, and have evidently been brought to the position they now occupy by the same agency as that which has planted blocks of syenite from Norway side by side with them. The chalk, then, is certainly older than the boulder clay. If you ask how much, I will again take you no further than the same spot upon your own coasts for evidence.
Patches of the northern drift, at elevations of about 200 feet above the Thames, occur in the neighbourhood of London, as at Muswell Hill, near Highgate. In this drift, blocks of granite, syenite, greenstone, Coal-measure sandstone with its fossils, and other Palaeozoic rocks, and the wreck of Chalk and Oolite, occur confusedly mixed together.
Word Of The Day
Others Looking