"It is impossible to avoid associating such a formation with the fine, smooth, homogeneous clays and schists, poor in fossils, but showing worm- tubes and tracks, and bunches of doubtful branching things, such as Oldhamia, silicious sponges, and thin-shelled peculiar shrimps.

But just as a silicious deposit may be metamorphosed into opal or quartzite, and chalk into marble, so known metamorphic agencies may metamorphose clay into schist, clay-slate, slate, gneiss, or even granite.

And, as Wyville Thomson suggests, in the passage I have quoted above (p. 17), it further enables us to assign a new cause for the occurrence, so puzzling hitherto, of thousands of feet of unfossiliferous fine-grained schists and slates, in the midst of formations deposited in seas which certainly abounded in life.

The country through which this creek passes is poor and stony, low hills of sandstone schist and limestone rising immediately behind the narrow strip of grassy land, which is fertilised by the overflow of the creek in the rainy season.

At 6.0 a.m. left the camp and steered a course north 60 degrees east, gradually ascending among hills of schist and sandstone till 8.20, when we reached the level tableland.

Steered east from the hill, and traversed an undulating country, the rocks being basalt, sandstone schist, and jasper; the basalt forming the higher ground, though on the banks of the creek the jasper rested on the basalt.

The hills which bound the valley of the creek are basalt, sandstone, and schist.

Several of the horses had strayed some distance from the camp, and we did not start till 12.30 p.m., when we steered north by west till 5.15 p.m. and camped at a small creek in a deep rocky valley; the country after leaving the basaltic plain was very rocky, the hills composed of schist with a superstratum of red sandstone; grass was abundant in the valley, but the hills produced little but triodia and small gum-trees.

Slate, quartz, schist, granite, and trap are the principal rocks, and by their decomposition do not produce a soil favourable to vegetation, the country becoming more desolate as we advanced.

Low hills of schist trap and granite formed a country near the river, and farther back high ranges bounded the valley; they appeared to be flat-topped and with horizontal strata of sandstone on the summits.

The country appears to be chiefly granite and mica schist, with thin beds or streams of lava, which have come from the ranges to the north and advanced to various distances into the more level land.

The prevailing rock granite, traversed by numerous veins of dark trap, and in the latter part of the day porphyry and schist appeared; concretions of limestone were frequent near the trap veins.

Two leagues beyond Piri, at Salapunco, the road skirts the base of precipitous cliffs, the beginnings of a wonderful mass of granite mountains which have made Uilcapampa more difficult of access than the surrounding highlands which are composed of schists, conglomerates, and limestone.

In mountains, a series of serrated peaks denotes the presence of dolomites; rounded heads mean calcareous rocks; and needles, crystalline schists.

The flint tools, knives, scrapers and the like indicate that they thought they would hunt and slay their quarry when brought down, and fight their foes; and the schist objects found in the graves, which M. de Morgan identifies as amulets, shows that even in those early days man believed that he could protect himself against the powers of supernatural and invisible enemies by talismans.

When the calcareous region of the Gévaudan is reached, the schist, slate, and gneiss disappear.

Great black precipitous rocks of schist, their hollows filled with sombre foliage, rose in solemn grandeur far above me, and in the bottom the plunging stream foamed and roared.

Survey Mining Statistics, No 1), where seventy-seven mines are enumerated, of which three are said to be in "porphyritic schist," all the others in granite, mica schist, clay, slate, etc.]

Survey Mining Statistics, No 1), where seventy-seven mines are enumerated, of which three are said to be in "porphyritic schist," all the others in granite, mica schist, clay, slate, etc.]

There was Anvil Mountain, for instance, a bold schist peak crowned with a huge rock in the likeness of a blacksmith's anvil.

In fact, the number of fragments of coal isolated in schists and sandstone is very large, and without any communication with veins of coal or of bitumen that could have penetrated the vegetable.

The carbonized specimens were never fluid or pasty, since there are some that have left their impressions with the finest details in the schists and sandstones, but none of the latter that has left its traces upon the coal.

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.

All night long, stopping only when one or the other fell, they ploughed over basalt and hornblende schist that lacerated their feet, over blanched immensities under the steel moon, across grim, black ridges and through a basin of clay, circled by hills.

From hand specimens alone it is difficult to assign a name to this rock, as it partakes more or less of the characters of mica, chlorite, and talc-schists. PLANTS.