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As regards the geological indications of age, the best authority seems to point to the first appearance of man in the post-glacial times: that is to say, that the gravels in which the palaeolithic implements are found were deposited by the action of fresh water after the great glacial period, when, at any rate, Northern Europe, a great part of Russia, all Scandinavia, and part of North America were covered with icefields, the great glaciers of which left their mark in the numerous scoopings out of ravines and lake beds and in the raising of banks and mounds, the deposit of boulders, and the striation of rocks in situ, which so many districts exhibit.
When about half a mile from Five Lake Creek the largest portion of the canyon is taken up with irregular masses of granite over which a glacier, or glaciers, have moved. The striation and markings are down the valley, and looking up from below the canyon for a mile or more it has the appearance of a series of irregular giant steps, each step gradually sloping back to the step above.
Some of their conditions, which, in their rich striation, resemble crystals of beryl, are very massy and grand; others, meagre, harsh, or effeminate in themselves, are redeemed by richness and boldness of decoration; and I have long had it in my mind to reason out the entire harmony of this French Flamboyant system, and fix its types and possible power.
There was, however, not a whisper of war, nor anything visible except the thin, pale line like a striation on the distant hills. Then a far-off sound of thunder is heard. It is a gun. A faint puff of smoke is pointed out to us. Neither the rumble nor the transient cloudlet makes any apparent impression on the placid and wide dignity of the scene. Nevertheless, this is war.
Barney Bill cocked his white poll across the table with the perkiness of a quaint bird Paul saw that the years had brought a striation of tiny red filaments to his weather-beaten face and fixed her with his little glittering eyes. "Bill what? You think I'm 'urting his feelings?" He jerked a thumb towards his host. "I ain't.
Where portions of the till have been removed by the sea on the shores of the Forth, or in the interior by railway cuttings, the boulders imbedded in what remains of the drift are seen to have been all subjected to a process of abrasion and striation, the striae and furrows being parallel and persistent across them all, exactly as if a glacier or iceberg had passed over them and scored them in a manner similar to that so often undergone by the solid rocks below the glacial drift.
This is not, however, always so: for some clustered shafts are little more than solid piers channelled on the surface, and their form appears to be merely the development of some longitudinal furrowing or striation on the original single shaft. That clustering or striation, whichever we choose to call it, is in this case a decorative feature, and to be considered under the head of decoration.
These erratic blocks of foreign origin are often polished and striated, having undergone what is called glaciation, of which more will be said by and by. Blocks of the same mineral character, embedded at Biddenham in the gravel Number 3, have lost all signs of this striation by the friction to which they were subjected in the old river bed.
Even a simple inorganic crystal does not spring ready formed from its solvent, but first passes through phases of granulation and striation comparable with those which characterise the beginnings of vital growth. Metals exhibit in some respects phenomena similar to those possessed by organised beings. Thus, they show fatigue under long continued stress, and they recover their strength with rest.
Traces of an earlier and independent glaciation have also been observed in some regions where the striation, apparently produced by ice proceeding from the north-west, is not explicable by the radiation of land-ice from a central mountainous region. The mountains of North Wales were recognised, in 1842, by Dr.
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