Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 8, 2025
While the men are at work making portages I climb up the granite to its summit and go away back over the rust-colored sandstones and greenish-yellow shales to the foot of the marble wall. I climb so high that the men and boats are lost in the black depths below and the dashing river is a rippling brook, and still there is more canyon above than below. All about me are interesting geologic records.
Over the entire region limestones, shales, and sandstones were deposited through long periods of geologic time to the thickness of many thousands of feet; then the country was upheaved and tilted toward the north; but the Colorado River was flowing when the tilting commenced, and the upheaval was very slow, so that the river cleared away the obstruction to its channel as fast as it was presented, and this is the Grand Canyon.
Now you may see what I meant when I said that the newer rocks, though they lie on the top of the older, were often lower down than they are. But how do you know that they lie on the limestone? Look into that corner of the river, as we turn round, and you will see with your own eyes. There are the sandstones, lying flat on the turned- up edges of another rock. Yes; I see.
I have never met with, or seen described, any veins like these; but in form they resemble the ferruginous seams, due to some process of segregation, occurring not uncommonly in sandstones, for instance, in the New Red sandstone of England.
Coming back to Arlington depot, and walking on the track for about a quarter of a mile west through the deep cut, the manner in which the sandstones and shales which constitute so large a portion of New Jersey are laid and arranged can be seen to great advantage, this being one of the finest exposures in the formation.
Below this, and in place of the shales, are talc-schists, jasper, and hornstone; and at the bottom, instead of the siliceous and argillaceous sandstones, are quartzite and gneiss.
Every building is seen to be a remnant of once continuous beds of sediments, sand and slime on the floor of an ancient sea, and filled with the remains of animals, and every particle of the sandstones and limestones of these wonderful structures to be derived from other landscapes, weathered and rolled and ground in the storms and streams of other ages.
This range has nearly the same geographical position with respect to the Cordillera, which the gigantic Portillo line has, but it is of a totally different origin: it consists of various kinds of submarine lava, alternating with volcanic sandstones and other remarkable sedimentary deposits; the whole having a very close resemblance to some of the tertiary beds on the shores of the Pacific.
Our researches, as we have above stated, have been confined to different cannel coals, anthracite, boghead, and coal plants isolated either in coal pebbles, or in schists and sandstones.
a. b. a. b. a. b. Soft slates with subordinate sandstones fossils numerous at various horizons Orthis, Corals, Encrinites, etc. It will be seen that in all main points it agrees with the table drawn up in 1864 for the sixth edition of my "Elements." Mr.
Word Of The Day
Others Looking