Report of a Geological Reconnoissance Made in 1835, from the Seat of Government, by the Way of Green Bay and the Wisconsin Territory to the Coteau de Prairie, an Elevated Ridge Dividing the Missouri from the St. Peter's River, מהדורה 4Gales and Seaton, 1836 - 168 עמודים |
מהדורות אחרות - הצג הכל
מונחים וביטויים נפוצים
abound Alleghany amongst ancient anthracite anticlinal appear argillaceous beds bituminous coal bituminous coal field bluffs breccia calcareous called carboniferous limestone causes chalk character clay coal measures conglomerate containing copper Coteau de Prairie Cumberland deposites diagram distance earth east elevation England escarpment Europe extensive feet high formation fossils fresh-water geological column geologists gneiss granite grit horizontal hornblende hundred feet Indians islands lake Lake Pepin land left bank lime localities lower marls masses mica miles millstone grit mineral structure Mississippi Missouri mountain Nacotahs numerous observed old red sandstone oolitic order of nature organic remains period Peter's portion Potomac Prairie du Chien present order primary primordial rocks quartz red shale remarkable resembling ridge right bank river seams shells side Silurian slates slaty sometimes species stone strata stratified stream surface tertiary thickness tion trees United upper valley vicinity Virginia wealden group whilst
קטעים בולטים
עמוד 130 - How a work of this kind could exist in a country that has hitherto (according to the generally received opinion,) been the seat of war to untutored Indians alone, whose whole stock of military knowledge has only, till within two centuries, amounted to drawing the bow, and whose only breastwork even at present is the thicket, I know not. I have given as exact an account as possible of this singular appearance, and leave to future explorers of these distant regions to discover whether it is a production...
עמוד 130 - I am convinced that it must have been designed for this purpose. It fronted the country, and the rear was covered by the river, nor was there any rising ground for a considerable way that commanded it ; a few straggling oaks were alone to be seen near it. In many...
עמוד 65 - ... granite mountains, — the whole truth flashes upon us, and we clearly understand, that these mountains have once existed at lower levels, and that they have been forced up through the superincumbent...
עמוד 130 - I had greater reason to suppose that it had really been intended for this many centuries ago. Notwithstanding it was now covered with grass, I could plainly discern that it had once been a breast-work of about four feet in height, extending the best part of a mile, and sufficiently capacious to cover five thousand men.
עמוד 130 - In many places small tracts were worn across it by the feet of the elks and deer, and from the depth of the bed of earth by which it was covered, I was able to draw certain conclusions of its great antiquity. I examined all the angles and every part with great attention, and have often blamed myself since, for not encamping on the spot, and drawing an exact plan of it. To show that this description is not the offspring of a heated imagination, or the chimerical tale of a mistaken traveller, I find...
עמוד 29 - In the United States these slates are largely developed in what is called the gold region, especially in Virginia, the gold being in the ferruginous quartzose veins which traverse this formation. The Germans have called all combinations of hornblende and felspar, when they have a granite structure, griinstein or greenstone rocks, and accordingly, as they are compact or fissile in their structure, they have been designated as primitive greenstone or greenstone slate. Hornblende is heavier than quartz...
עמוד 136 - ... quantities on the bed of the river immediately at the foot of the falls. That part of the river on the north side of the island is about two hundred and twenty yards in width. There is a very fine smooth section of the rocks here to the water, about 90 feet high.
עמוד 130 - ... men. Its form was somewhat circular, and its flanks reached to the river. Though much defaced by time, every angle was distinguishable, and appeared as regular, and fashioned with as much military skill, as if planned by Vauban himself. The ditch was not visible, but I thought, on examining more curiously, that I could perceive there certainly had been one. From its situation, also, I am convinced that it must have been designed for this purpose.
עמוד 130 - Though much defaced by time, every angle was distinguishable, and appeared as regular and fashioned with as much military skill as if planned by VAUBAT* himself. The ditch was not visible ; but I thought, on examining more curiously, that I could perceive there certainly had been one. From its situation, also, I am convinced that it must have been designed for that purpose.
עמוד 129 - One day, having landed on the shore of the Mississippi, some miles below Lake Pepin, whilst my attendants were preparing their dinner, I walked out to take a view of the adjacent country. I had not proceeded far before I came to a fine, level, open plain, on which I perceived at a little distance a partial elevation that had the appearance of an entrenchment.