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Updated: June 26, 2025
Thus, after seven dreary months of negotiation, after protocols and memoranda in ten thousand folia, the august diplomatists had travelled round to the points from which they had severally started.
The folia in the fragment and in the surrounding rock strike in the same N.N.E. and S.S.W. line; but in the fragment they are vertical, whereas in the gneiss-granite they dip at a small angle, as shown by the arrows, to S.S.E. This fragment, considering its great size, its solitary position, and its foliated structure parallel to that of the surrounding rock, is, as far as I know, a unique case: and I will not attempt any explanation of its origin.
Are we to admit that in the northern part of the Chonos Archipelago, mica-slate was first accumulated in parallel horizontal folia to a thickness of about four geographical miles, and then upturned at an angle of forty degrees; whilst, in the southern part of this same Archipelago, the cleavage-laminae of closely allied rocks, which none would imagine had ever been horizontal, dip at nearly the same angle, to nearly the same point?
Great veins of quartz are numerous in the mica-schists; wherever these occur the folia are much convoluted.
See also Beers's English Romanticism. Percy. Essay, by J.W. Hales, Revival of Ballad Poetry, in Folia Literaria. See also Beers's English Romanticism, etc. Defoe. Essay, by L. Stephen, in Hours in a Library. Richardson. Life: by Thomson; by A. Dobson. Essays, by L. Stephen, in Hours in a Library; by A. Dobson, in Eighteenth Century Vignettes. Fielding. Smollett.
By the term FOLIATION, I refer to the layers or plates of different mineralogical nature of which most metamorphic schists are composed; there are, also, often included in such masses, alternating, homogeneous, fissile layers or folia, and in this case the rock is both foliated and has a cleavage.
As in the case of cleavage, the angle of the dip in foliated rocks is generally high but variable, and alternates from one side of the line of strike to the other side, sometimes being vertical: in the Northern Chonos Islands, however, the folia are inclined almost always to the west; in nearly the same manner, the cleavage-laminae in Southern Tierra del Fuego certainly dip much more frequently to S.S.W. than to the opposite point.
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.
Thus, after seven dreary months of negotiation, after protocols and memoranda in ten thousand folia, the august diplomatists had travelled round to the points from which they had severally started.
Hence it appears very difficult, without varying considerably the elements of the problem, thus to explain the anomalous strike and dip of the foliated mica- schist, especially in those parts, namely, at the base of the range, where the folia are almost horizontal. Mr.
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