Geologically considered, its upper stratum is the silurian limestone, which in the order of superposition, immediately overlies the red shaly sandstone at the falls.
Aghadez is situated on a hamadah, or lofty plateau of sandstone and granite formation.
It consists of a sort of coarse sandstone and is in part overgrown with herbage.
The stone used by the Oraibians for making piki is from a sandstone quarry near Burro Springs.
In every house you will find, in a corner, a row of two, three, or four square boxlike compartments or bins of thin slabs of sandstone set on edge.
Scotland for any hard and compact kind of stone, as distinguished from sandstone or freestone and rocks of slaty structure.
If that sandstonehad remained soft a little longer, we should have known nothing whatsoever of the existence of the reptile whose bones it had encased.
There are large tracts of sandstone in various parts of the world, in which nobody has yet found anything but footsteps.
The highest rock seen is a fine sandstone of closer grain than that at Tette, and quite metamorphosed where it comes into contact with the igneous rocks below it.
At the lakelet Chidia, we noticed the same sandstone rock, with fossil wood on it, which we have on the Zambesi, and knew to be a sure evidence of coal beneath.
We were now, when we crossed the boundary rivulet Nyamatarara, out of Chicova and amongst sandstone rocks, similar to those which prevail between Lupata and Kebrabasa.
Tette grey sandstone is common about Sinjere, and wherever it is seen with fossil wood upon it, coal lies beneath; and here, as at Chicova, some seams crop out on the banks of the Zambesi.
Tette stands on a succession of low sandstone ridges on the right bank of the Zambesi, which is here nearly a thousand yards wide (960 yards).
The white stratum is divided at two-thirds its height by a thin belt of greenish-white rock, and above it there is another belt of purple-gray sandstone about 12 feet thick.
The top of this sandstone forms the ground surface south of the point shown in the diagram, while on the north and east it forms the floor of the upper tier of cavate lodges.
This small ruin, like all the smaller ruins described, was built of river bowlders, or river bowlders with occasional slabs of sandstone or limestone, while the ruin last described consists exclusively of limestone slabs.
The specimen of argillaceous sandstone is made up of thin layers of fine-grained sand of the same sort as the first, alternating with others containing considerable clay.
The smaller ruins, on the other hand, were built usually of river bowlders, sometimes with an intermixture of slabs of limestone and sandstone but with a decided preponderance of river bowlders.
Vast inland seas, or lakes covered with a few islets, form the ideal of the Old Red Sandstone period.
In a depression of the granitic rocks of Massachusetts and Connecticut, the red sandstone occupies an area of a hundred and fifty miles in length from north to south, and from five to ten miles in breadth.
It presents very many distinct mineral forms, among which two predominate: green sandstone and blackish or grey clays.
This supposition is strongly supported by his researches into the mollusca of the Devonian system, and also by the fish-remains of the Devonian and Old Red Sandstone of Scotland and the West of England and Wales.
Another well-known impression, which has been left upon the sandstone of Corncockle Moor, in Dumfriesshire, is supposed to be the impress of the foot of some great fossil Turtle.
The red colour of the Old Red Sandstone of England and Scotland, and the total absence of fossils, except in the very uppermost beds, are considered by Professor Ramsay to indicate that the strata were deposited in inland waters.
The Old Red Sandstone rocks are composed of schists, sandstone, and limestones.
The oldest rocks consist of granite and schist, penetrated by intrusive dykes, and upon this foundation rest the flat-lying sedimentary deposits, beginning with a sandstone like the Nubian sandstone of Egypt.
Towards the north the crystalline floor is overlaid by the great sandstoneseries which covers nearly the whole of the country north of Hail.
Over both sandstoneand granite great sheets of lava have been poured, and these, protecting the softer beds beneath from further denudation, now stand up as the high plateaus and hills called harra.
Upon the sandstone rest a few scattered outliers of limestone, probably of Cretaceous age, the largest of which occur near Jauf and east of Bureda.
By a careful examination of her surroundings, the girl found that certain sandstone boulders that lay in jagged heaps to the right of her were worn smooth.
The sides of the ravine, which were very steep, were covered with innumerable blocks, of sandstone of every size and shape, over which alone any road could be found to the cove below.
Little Zion Canyon is an early stage in Nature's process of levelling still another sandstone step, that is all; this one fortunately of many gorgeous hues.
Both are the disclosure by erosion of similar strata of red sandstone which may have been more or less continuous before the great Rockies wrinkled, lifted, and burst upward between them.
Erosion has exposed this sandstonein several parts of the western United States, and many have been the interesting glimpses it has afforded of that strange period so many millions of years ago.
Harder than the sloping sandstone above and the shale below, it pushes aggressively into the picture, squared, perpendicular, glowing.
It may be that similarly rich deposits lie hidden in many places in the wide-spread Morrison sandstone which some day may be unearthed.
The life forms were at their full when the sands were laid which to-day is the wide-spread layer of sandstone which geologists call the Morrison formation.
This was carved from an outstanding spur of Navajo sandstone which lay crosswise of the canyon.
In the sloping sandstone ledges footholds for the horses must be cut, and even then they fell, until their loss seemed certain.
They left the gracious and grateful oasis to plunge into the desert, a chaos of sandstone and granite rocks.
This name was given them because they contain a good deal of red sandstone, and because they are superior to the Carboniferous rocks, while the Old Red Sandstone is inferior.
Remains of Labyrinthodonta from the Keuper Sandstone of Warwick"--'Quart.
Annelide-burrows (Scolithus linearus) from the Potsdam Sandstoneof Canada, of the natural size.
This is also the case, in many localities at any rate, with the finer beds of the Potsdam Sandstone in America.
The Triassic group forms the base of the Mesozoic series, and corresponds with the higher portion of the New Red Sandstone of the older geologists.
Opinions differ as to whether thissandstone is to be regarded as the highest bed of the Upper Silurian or the base of the Devonian.
In this group are comprised ordinary sand, the varieties of sandstone and grit, and most conglomerates and breccias.
These mountains rise generally in a succession of terraces and broad plateaus, with steep or even sheer sandstone escarpments.
The sandstone formation can be traced from the northern Pacaraima range on the N.
They are composed of a friable Tertiary sandstone and conglomerate, destitute of vegetation, and presenting a mere barren chaos of naked rock, deeply scored with precipitous ravines.
This fall is produced by the river flowing from a tableland of sandstone and conglomerate into a deep valley 822 ft.
We now entered upon the first pure sandstone that I had seen; this was a coffee-brown, and formed the substratum of the usual sedimentary limestone which capped the surface of the hill-tops.
A rivulet coming out of the wilderness falls over a ledge of red sandstone ten feet high and fifty feet broad, forming a beautiful cascade.
It overlies a bed of saliferous sandstone which has been worked for salt.
The solid rock (except the sandstone already mentioned) begins above the falls on the tributaries.
Papallacta is a village of thirty dwellings, situated in a deep valley on the north slope of Antisana, nearly surrounded by an amphitheatre of sandstone and basaltic precipices.
Finally, over the undulating surface of the denuded sandstone an ochraceous, unstratified sandy clay was deposited.
The fossiliferous bed at Pebas is as plainly in situ as the Medina sandstone at Genesee Falls.
The best-known species is Coccosteus cuspidatus (decipiens) of the Lower Red Sandstone or Devonian of Scotland.
The fish-remains next in age in America are from the Bloomfield sandstone in Pennsylvania of the Onondaga period in the upper Silurian.
On the northern side the Vosges are connected with the Hardt sandstone plateau (Kalmit, 2241 ft.
The sandstone range of the Elbe unites in the east with the low Lusatian group, along the east of which runs the best road from northern Germany to Bohemia.
There is little of thesandstone cap in this area, and the logs lie in the blue-gray marl formation.
As the support was plucked from about them, they left their sleeping places in the sandstone and marl and rolled to the levels below.
The soft smooth sandstone was an ideal surface for the artist to work upon, and nowhere in the world, in that age, could such suitable tools be found to work with.
Each end is firmly embedded in the sandstone rock, which was formerly the sand at the bottom of the sea.
Slowly the fingers of time, tipped with wind and rain, broke through the heavier sandstone above, and tore away the softer layers of shale and marl.
At one place a slender column of sandstone rises to the height of twenty-five or thirty feet, and broadens at the top into a platform perhaps ten feet across.
Part of the log is still encrusted with the sandstone which wrapped it about, before wind and rain unshrouded it.
With these rude instruments, this unknown people left for us a record of their existence graven deep in the sandstone in sheltered places.
The material is red sandstone and the edifice dates from about 1630--the founder being the same Padre de Acevedo that is credited with establishing Gran Quivira.
Many stems of Sigillaria may be seen near Morpeth, standing erect at right angles to the planes of alternating strata of shale and sandstone (Fig.
Stem of Sigillaria pachyderma in an erect position, covered by successive deposits of sandstoneand shale; one of the stems is bifurcated.
In the Lower Old Red Sandstone of Scotland he detected Fucoids, a Lepidodendron, and Lignite with a distinct Coniferous structure resembling that of Araucaria,[1] besides a remarkable pinnate frond.
The erect silicified stems of coniferous trees exist in their natural positions in the "dirt-bed," an old surface soil in the sandstone strata of the Purbeck series in the Isle of Portland, Dorsetshire.
In the latter localities they lay diagonally athwart the sandstone strata, at an angle of about 30°, with the thicker and heavier part of their trunks below, like snags in the Mississippi.
Very early in the morning we passed Cape Weary and Cape Tribulation, and rounding the hill of granite and sandstone rock, called Mount Cook, we anchored opposite Cooktown and the celebrated Endeavour Beach.
A colonnade of red sandstone surrounds the court, and the whole beauty of the mosque lies in the splendid contrast of the rich red sandstone against the white marble court.
The Lat is a single shaft of sandstone tapering very slightly towards the top.
The two mosques that flank the platform are of red sandstone inlaid with marble, and face east and west.
Opposite the entrance to the channel, which is formed of red sandstone cliffs, stands the flagstaff of the signal station, where flags of every nation are run up, showing the departure and arrival of their ships.
Four grand causeways coming from four of these marble and sandstone gateways meet at the marble platform on which stands the mausoleum.
One of the great charms of this range is the rich colour of their red sandstone masses, blackened and weather-stained in parts by the action of centuries.
It is entirely built of red granite--not sandstone as at first appears, for that would be too easy and crumbling a substance for such massive walls and ramparts.
It is rendered so imposing from the huge chabutra of red sandstone on which it stands, open to the surrounding country.
At the end of each of these drains pieces of charcoal and sandstone are placed to act as a filter, thus purifying the water before it enters into the ground.
