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 RiverGales 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 Green Bay 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 sometimes species stone strata stratified stream surface tertiary thickness tion United upper valley vicinity Virginia wealden group whilst
קטעים בולטים
עמוד 49 - ... miles above Nashville, and those near Herculaneum, on the Mississippi, furnish striking instances, especially at this last-named place, of the parallel disposition of the cherty layers. The next formation in the series is the millstone grit and shale, the inferior part of which, when well defined, consists of shales, with occasional beds of limestone and coal. The upper part is made up of coarse sandstones or grit, with pebbles of quartz. This is an extensive formation in England, occupying a...
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 129 - One day, having landed on the shore of the Mississippi, some miles below Lake Pepin, whilst my attendants were preparing my 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 intrenchment.
עמוד 130 - 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 130 - 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 way that commanded it ; a few straggling oaks were alone to be seen near it. In many places, small tracks were worn across it by the feet of the elks and deer, and from the depth...
עמוד 130 - ... 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 on enquiry since my return, that Mons.
עמוד 38 - 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 136 - Anthony, a dis^ tance not much exceeding eight miles by water, and the banks not exceeding eighty-five feet, to the flat prairie land of the country. An island about 450 yards long divides the Mississippi into two parts at the falls of St, Anthony, which have a very irregular outline, owing to the soft sandstone being washed out unequally in places, and the superincumbent strata of limestone falling down in large blocks ; these are piled up in great quantities on the bed of the river immediately...
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. It fronted the country, and the rear was covered...
עמוד 130 - ... part of a mile, and sufficiently capacious to cover five thousand 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...