The reader has before him the fossil of the Œningen schist (Fig.
A dark green hornblende schist occurs at two miles before coming to Shabushquaia river.
Specks of copper pyrites were found in small quartz veins in the schist at the foot of the falls at the eighth portage below Lake St. Joseph on the Albany.
By the road from Pontivy to Guingamp, at the hamlet to Belaire, is a menhir of slatyschist 15 ft.
It is granitic on the west, andschist on the east, and the granite is of a soft quality, allowing the sea to decompose and break it up.
The Monts d'Arrée are of Cambrian schist and furnish slates here and there of good quality.
Here the walls stand on the blackschist rock, and are only pierced by a single postern that gives access to a steep descent by steps into the valley.
Dykes of quartz and diorite have traversed the schist and granite, and the face of the country is spotted with eruptions of igneous matter.
Taking a section across the inner basin, the granite is quitted at Plounéour, then the ridge of Cambrian schist is reached, after crossing the culminating point of S.
The highest rock observed with mica schist was at an altitude of 3440 feet.
Numerous large pitholes in the fine-grained schist in its bed show that much water has flowed in it.
Near the Lake, and along its eastern shore, we have mica schist and gneiss foliated, with a great deal of hornblende; but the most remarkable feature of it is that the rocks are all tilted on edge, or slightly inclined to the Lake.
All gradations may be found between it and unfoliated quartzite on the one hand and mica schist on the other.
The limestones have recrystallized into marbles, among them the famous marbles of Vermont; the Cambrian sandstones have become quartzites, and the Hudson shale has been changed to a schist exposed on Manhattan Island and northward.
Hornblende schist is common over large areas in the Lake Superior region.
Twenty years ago, at the date of the final publication of the New Hampshire maps, the doctrine of an igneous origin of the crystalline schisthad hardly been hinted at.
Next to this is a great belt of Palaeozoic rocks, through which rise the granite, gneiss and schist of the Zanskar and Dhauladhar ranges and of the Pir Panjal.
Finally, in Baltistan and the Ladakh range there is a broad zone composed chiefly of gneiss and schist of ancient date.
The pebbles were derived from the central nucleus of granite from beyond Assouan to the upper end of the Red Sea, round which are folded successive zones of gneiss and schist pierced by intrusive masses of porphyry and serpentine.
In this group calc-spar or dolomite wholly replaces the quartz and films of argillaceous matter, of which, especially in Scotland, micaceous schist is usually composed.
They are micaceous strata; and thus the true cipollino is a mixture of talcose schist with white saccharoidal marble, and may be said to form a transition link between marble and common stone.
MacCulloch, "may at first have been mere clay; for clay or shale is found altered by trap into Lydian stone, a substance differing from hornblende-schist almost solely in compactness and uniformity of texture.
Thus, in Glen Tilt, in Scotland, alternating strata of limestone and argillaceous schist come in contact with a mass of granite.
As in fossiliferous formations strata of pure siliceous sand alternate with micaceous sand and with layers of clay, so in the crystalline or metamorphic rocks we have beds of pure quartzite alternating with mica-schist and clay-slate.
This killas is converted into hornblende-schist near the contact with the veins.
Frequently, between the granite and the hornblende slate, above mentioned, grains of mica and crystalline felspar appear in the schist, so that rocks resembling gneiss and mica-schist are produced.
Unconformable junction of old red sandstone and Silurian schist at the Siccar Point, near St. Abb's Head, Berwickshire.
General view of junction of granite andschist of the Valorsine.
As in the secondary and tertiary series we meet with limestone alternating again and again with micaceous or argillaceous sand, so we find in the hypogene, gneiss and mica-schist alternating with pure and impure granular limestones.
The first three invariably are, unless protected by a harder rock; the next three usually are; the Catoctin schist only in small parts of its area; the Weverton only along a small part of Catoctin Mountain.
The type consists of fairly rough mountain land, and is very stony, having from 15 to 60 percent of small and large schist fragments on the surface, some of which are several feet in diameter.
Throughout its entire area the schist is singularly uniform in appearance, so that only two divisions can be made with any certainty at all.
The Catoctin schist is geographically the most important of the volcanic rocks of Loudoun.
It produced effects varying from granite with a rude gneissoid appearance, through a banded fine gneiss, into a fine quartz schist or slate.
The relation between marble and schist is very perfectly shown at an old quarry west of Leesburg.
Sections of the finer schist in polarized light show many small areas of quartz and plagioclase and numerous crystals of epidote, magnetite, and chlorite, the whole having a marked parallel arrangement.
The soil and subsoil are usually free from stones, but occasional areas have from 5 to 30 per cent of angular quartz orschist fragments on the surface.
The pebbles of limestone range in color from gray to blue and dark blue, and occasionally pebbles of a fine white marble are seen; with rare exceptions also pebbles of Catoctin schist and quartz occur.
The surface is generally free from stones, though occasional small areas have a few quartz and granite or schist fragments.
Often a mica-schist enters into the composition of the subsoil, giving it a soft and greasy feel.
For instance, an igneous rock may become a schist without going through the intermediate stage of sedimentation.
In eastern Wyoming is a unique deposit of uranium ore in a quartzite which lies between mica-schist and granite.
The ore is in a series of parallel and overlapping veins striking with the trend of the range, associated with granodiorite intrusives in schist and slate.
It is characteristic of the paragonite schist of the Alps.
From time to time Tundup Sonam reared up a slab of schist to show the way to Tsering, who was coming behind without a guide.
Now we followed the northern shore over many very difficult mountain spurs of black schist and quartzite; the ground is covered with gravel, sometimes with small patches of coarse grass, and then again is very sandy.
A staircase of flags of schist leads up to the Dopcha, an open platform paved with flagstones where the religious spectacles take place on feast days.
On the right side, which we follow, the cliffs of schist fall perpendicularly to the river, and the dangerous, narrow road runs like a sill along the wall of rock.
It is very seldom that a small hill of dark schist peeps out above the snow.
We mounted the acclivity past rows of well-kept manis, which had the appearance of broken-down walls, with red-painted inscriptions chiselled out of the blocks of schist and framed in red.
Only sandstone and schist were round us after that, and when the truck rolled towards the shaft, I followed, with my heart as full as though it were a funeral.
There the vein had failed, between the schistand the tertiary sandstone.
They ran through the wall of schist and sandstone, some shored up with great, roughly-hewn beams, others lined with a thick casing of wood.
The inhabitants fled for safety to the top of the schist rocks bordering the lake; terror spread in all directions; whole families in frantic haste rushed towards the tunnel in order to reach the upper regions of the pit.
The schist was excessively hard, and it had not been necessary to bank up the end of the tunnel where the works had come to an end.
The castle stands amidst a group of schist rocks, about a mile in circumference.
On the brow the schist blocks, traversed by porphyry, are upheaved in the wildest confusion, and assume an endless variety of form, more so than the shore blocks, which are washed and rolled and rounded by the waves.
The beautiful emerald of Peru is found in a clay schist mixed with some calcareous matter.
When free from lime and iron, it forms an excellent material for making refractory fire-bricks, being an infusible compound of alumina and silica; one of the best examples of which is the schist known by the name of Stourbridge clay.
Red clay, a bed of variable thickness as well as the lower strata, according as the cupreous schist is nearer or farther from the surface.
These washings may be added to the schist lixivia.
Mansfeldt copper schist mines in the district called Burgoerner, or Preusshoheit.
Alum schist very commonly contains vitriolkies, and affords, after being roasted and weather-worn, a considerable quantity of copperas, which must be carefully separated by crystallization from the alum.
Hericart de Thury observed at very great heights in the Alps of Dauphiny, in a formation of schist and grey-wacke with vegetable impressions, which reposes directly on the primitive rocks.
The curious strata of bituminous schist in the first of these localities, are among the most ancient of any which contain the exuviae of organised bodies not testaceous.
A mortar made of quicklime mixed with the exhaustedschist in powder, and iron turnings, is said to answer well for this purpose.
Cupreous schist (kuperschiefer), of which the bottom portion, from 4 to 6 inches thick, is that selected for metallurgic operations.
At Whitby 130 tons of calcined schist produce on an average 1 ton of alum.
The flame and hot air of a reverberatory furnace are made to play along the mixture, in the same way as described for evaporating the schist liquors.
It is in this schist that the fine marble known under the name of the lumachella of Bleyberg is quarried.
Veins of red granite are there seen branching out from the principal mass, and traversing the black micaceous schist and primary limestone.
There are signs of the former action of such vapors in rents of the micaceous schist of Thermia, and thermal springs now issue from the grottoes of that island.
The quartz rock on the east of Walls, and the gneiss and mica-schist of Garthness, suffer the same fate.
The cavernous structure here alluded to is not altogether confined to calcareous rocks; for it has lately been observed in micaceous and argillaceous schist in the Grecian island of Thermia (Cythnos of the ancients), one of the Cyclades.
The uneven schistose layers of mica-schist and gneiss are probably layers of deposition, which have assumed a crystalline texture.
Sure enough, in one of the soft mica-schist rocks of the chimney, someone had chiseled a deep and delightful hidey-hole.
Under a rafter he found a cunningly concealed hidey-hole, drilled like a flicker's nest into one of the soft mica-schist stones of the chimney.
On what did these so-called 'most ancient' formations rest, if gneiss and mica schist must be regarded as changed sedimentary strata?
Origin of granular or saccharoidal marble, silicification of schist into ribbon jasper.
Strate of transition argillaceous schist in the Fichtelgebirge, which can be traced for a length of 16 miles, are transformed into gneiss only at the two extremities, where they come in contact with granite.
If we pass from these general considerations to individual examples, we find that schist is converted, by the vicinity of Plutonic erupted rocks, into a bluish-black, glistening roofing slate.
I was leaving the dark schistand was approaching those immense accumulations of jurassic rock, whose singular forms and brilliant colours lend such extraordinary grandeur to the scenery of the Upper Tarn.
Below 7000 feet, mica-schist prevails, always inclined at a very high angle; and I found jasper near Namtchi, with other indications of Plutonic action.
The ascent to the village from the river is by steps cut in a narrow cleft of the schist rocks, to a flat, elevated 4,178 feet above the sea: we here procured a cottage, and found the people remarkably civil.
In the Menominee region of Michigan and Wisconsin, the Quinnesec schist series mainly consist of schistose quartz porphyry with associated gneisses.
In Japan, in the Abukuma plateau, there is much granite, gneiss and schistwhich may be of this age.
A HUNCH of granite heaved up, and carrying on its back the beds of schist and gneiss that had overlain it, stands up between the Gapeau and the Argens.
He soon saw the strategic value of the chain of granite and schist mountains, and returning to Africa collected a large band, crossed the sea, and took possession of the whole mountainous block.
At Hyères we have passed abruptly from the limestone to the schist that has been heaved up by the granite of the Montagnes des Maures.
Its mass of granite, gneiss, and schist is separated from the surrounding limestone mountains by profound and wide valleys, those of the Aille, the Argens, and the Gapeau.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "schist" in a variety of sentences. We hope that you will now be able to make sentences using this word.
