Vietnam or Thailand ? Vote for the TOP Country of the Week !

Updated: June 1, 2025


He says that it is merely the special application to the arch of the great ornamental system of foliation, which, "whether simple as in the cusped arch, or complicated as in tracery, arose out of the love of leafage. Not that the form of the arch is intended to imitate a leaf, "but to be invested with the same characters of beauty which the designer had discovered in the leaf."

Looking to the basal, metamorphic, and plutonic rocks of the continent, the areas formed of them are likewise vast; and their planes of cleavage and foliation strike over surprisingly great spaces in uniform directions.

Foliation may be used for those alternating layers or plates of different mineralogical nature of which gneiss and other metamorphic schists are composed. That the planes of foliation of the crystalline schists in Norway accord very generally with those of original stratification is a conclusion long since espoused by Keilhau. In Scotland, also, Mr.

On this side the dip was also to the northward, and the whole cliff was crossed by cleavage planes, dipping south, and apparently cutting those of the foliation at an angle of about 60 degrees: it is the only decided instance of the kind I met with in Sikkim. Soc.

Where in one district the rocks are fissile, and in another adjoining district they are foliated, the planes of cleavage and foliation are likewise generally parallel: this is the case with the feldspathic homogeneous slates in the southern part of the Chonos group, compared with the fine foliated mica-schists of the northern part; so again the clay- slate of the whole eastern side of Tierra del Fuego cleaves in exactly the same line with the foliated gneiss and mica-slate of the western coast; other analogous instances might have been adduced.

For a space of 300 miles on the shores of the Chonos and Chiloe Islands, we have seen that the foliation seldom deviates more than a point of the compass from a N. 19 degrees W. and S. 19 degrees E. strike.

Every crocket which you are to crest with sculpture, every foliation which you have to fill, presents itself to the spectator's fancy, not only as a pretty thing, but as a problematic thing.

The larger, on the north, consists of three lights, with three circles in the head; the foliation of these outside the glass forms cinquefoil openings; the smaller window is of a similar character, but consists of two lights only, with a single foliated arch above them.

In Eastern Banda Oriental, in parts of Brazil, and in some other districts, the foliation runs in the same direction with the mountain-ranges and adjoining coast-lines: amongst the Chonos Islands, however, this coincidence fails, and I have given my reasons for suspecting that one granitic axis has burst through and tilted the already inclined folia of mica-schist: in the case of cleavage, the coincidence between its strike and that of the main stratification seems sometimes to fail.

TALC SCHIST consists of quartz and TALC, a light-colored magnesian mineral of greasy feel, and so soft that it can be scratched with the thumb nail. HORNBLENDE SCHIST, resulting in many cases from the foliation of basic igneous rocks, is made of folia of hornblende alternating with bands of quartz and feldspar. Hornblende schist is common over large areas in the Lake Superior region.

Word Of The Day

dishelming

Others Looking