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The question then will assume this form. We know that the tides must have been greater in Cambrian or Laurentian days than they are at present; so that they were available as a means of assisting other agents in the stupendous operations of strata manufacture which were then conducted.
The emergence of strata at the surface is called by miners their OUTCROP, or BASSET. If, instead of being folded into parallel ridges, the beds form a boss or dome- shaped protuberance, and if we suppose the summit of the dome carried off, the ground-plan would exhibit the edges of the strata forming a succession of circles, or ellipses, round a common centre.
This chalky fragment is only one of many detached masses which have been included in the drift, and forced along with it into their present position. We are called upon, then, to explain how any force can have been exerted against the upper masses, so as to produce movements in which the subjacent strata have not participated.
The Lower Cambrian is characterized by the presence of a trilobitic fauna in which the genus Olenellus is predominant. This, the OLENELLUS ZONE, is one of the most important platforms in the entire geological series; for, the world over, it marks the beginning of Paleozoic time, while all underlying strata are classified as pre-Cambrian.
It is thus, upon chemical principles, to be demonstrated, That all the solid strata of the globe have been condensed by means of heat, and hardened from a state of fusion. But this proposition is equally to be maintained from principles which are mechanical.
The very marked dip in the strata did not extend beyond the latter, and here I could not detect any. Flights of large vampires, whistling ducks, many-coloured parakeets, and varieties of small birds, made the river quite alive, and their continued cry of alarm gave vivacity to the scene, and disturbed the stillness that had reigned there for years.
Thus, when human impatience rashly substitutes swiftly acting artificial contrivances for the slow methods by which nature drains the surface and superficial strata of a river-basin, the original equilibrium is disturbed, the waters of the heavens are no longer stored up in the earth to be gradually given out again, but are hurried out of man's domain with wasteful haste; and while the inundations of the river are sudden and disastrous, its current, when the drains have run dry, is reduced to a rivulet, it ceases to supply the power to drive the machinery for which it was once amply sufficient, and scarcely even waters the herds that pasture upon its margin.
New Zealand, like the Philippines, Java and the Japanese Islands, is situated over a great earth-fissure or line of weakness. Subsidence or dislocation from tensile strain of the crust took place, and the influx of water to new regions of heated strata may have developed the explosive force.
As the breeze is not felt in these immense forests of Guiana, and the refluent polar currents do not penetrate them, the column of air which reposes on this wooded zone is not renewed by dryer strata. It is saturated with vapours which are condensed into equatorial rains. The missionary assured us that it often rains here four or five months without cessation.
"The soil is a deep, rich, dark mould, on a deep stratum of tenacious clay; and that on a foundation of rocks, which often break through both strata, lifting their backs above the surface. The trees which chiefly grow here are the gigantic, black oak; magnolia grandi-flora; fraximus excelsior; platane; and a few stately tulip trees." What Mr.
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