Report of a Reconnoissance Made in 1835, from the Seat of Government: By the Way of Green Bay and the Wisconsin Territory, to the Coteau de Prairie, and Elevated Ridge Dividing the Missouri from the St. Pater's River, by G.W. Featherstonhaugh. Doc. 333 - Printed by Order of the Senate. Washington, Gales & Seaton, 18361836 - 160 עמודים |
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 LIBRARIES STANFORD lime localities lower marls masses mica miles millstone grit mineral structure Mississippi Missouri mountain Nacotahs numerous observed old red sandstone oolitic 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 Silurian slates sometimes species STANFORD UNIVERSITY stone strata stratified stream surface tertiary thickness tion United UNIVERSITY LIBRARIES upper valley vicinity Virginia wealden group whilst
קטעים בולטים
עמוד 128 - ... 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. It fronted the country, and the rear was covered by the river ; nor was there any rising ground for a considerable...
עמוד 128 - On a nearer inspection, 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 128 - 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. It fronted the country, and the rear was covered by the River;...
עמוד 112 - Virginia, the coal strata have to be penetrated 1 to arrive at the salt. In my report of last year§ I gave a section of this kind 700 feet deep, at Kiskiminetas, in Pennsylvania. Dr. Hildreth states that ? twenty-five miles from the mouth of the Muskingum, wells have been sunk 900 feet deep for salt, which is 300 feet below the level of tide-water. It is a very general opinion that these wells are supplied from the percolation of fresh water through certain saliferous strata, charged with particles...
עמוד 36 - Guide to Geology, page 19, classed all the rocks beneath the old red sandstone as " Primary strata," adding, " It is usual to class the upper systems under the title of Transition strata,, and to confine the name of Primary to the mica, schist, and gneiss systems.
עמוד 128 - 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 134 - ... 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 141 - The mine was at the foot of a mountain ten leagues long, that see.rned to be composed of the same substance. After removing a black burnt crust as hard as rock, the copper could be scraped with a knife.
עמוד 127 - 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.
עמוד 66 - Geology. midal peaks, which time, and the abrasions consequent upon their upraising, have worn into their present forms, were once, in part, many thousand feet beneath the now lateral surface of the stratified beds they have thrown into this high inclination. These sections show that mountainous chains may have been upraised at any of the periods belonging to the succession of strata, and that each period may have its peculiar system of mountains. To a great extent, this has been found to be the...