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Updated: May 25, 2025
The chain that extends from Alaska to Chili within the eastern shore of the Pacific Ocean, and the many hundreds of volcanoes of the Pacific Islands bring to the surface vast quantities of eruptive rocks which break up and overlie the sedimentary strata formed regularly in other ways and at other times.
Here the sedimentary rim-rock lay open as a book and as he followed along its face he found hole after hole pecked into one copper-stained stratum. It was the same broad stratum of quartzite which, on coming to the creek, had dipped down into Bunker's claim; and now Denver knew that others beside himself thought well of that mineral-bearing vein.
Considering the perishable nature of many of the lower organic forms, the metamorphosis of many sedimentary strata, and the gaps that occur among the rest, we shall see further reason for distrusting our deductions.
When boilers are free from fur, and where it is intended to keep them free from such, a continuous current may be set up, by means of which the sedimentary salts may be decomposed, and a precipitate produced in a pulverized form, which can be removed with equal facility.
It possesses gold, copper, and coal, hot springs and geysers, sedimentary and volcanic rocks and coralline limestone, alluvial plains, abrupt hills and lofty mountains, a moist climate, and a grand and luxuriant forest vegetation. The few days I stayed here produced me several new insects, but scarcely any birds. Butterflies and birds are in fact remarkably scarce in these forests.
From this same cause, the strata which were formed within the lagoons of atolls and lagoon-channels of barrier-reefs, and which must consist in a large part of sedimentary matter, would more often be preserved to future ages, than the exterior solid reef, composed of massive corals in an upright position; although it is on this exterior part that the present existence and further growth of atolls and barrier-reefs entirely depend.
According to a third theory they represent portions of the earth's original crust; not, indeed, its original surface, but deeper portions uncovered by erosion and afterwards mantled with sedimentary deposits. All these theories agree that the present foliated condition of these rocks is due to the intense metamorphism which they have suffered.
The example of the Paris Communists in 1871 enforced his pleas; and in the subsequent years thousands of students, many of them of the highest families, quietly left their homes, donned the peasants' garb, smirched their faces, tarred their hands, and went into the villages or the factories in the hope of stirring up the thick sedimentary deposit of the Russian system . In many cases their utmost efforts ended in failure, the tragi-comedy of which is finely set forth in Turgenieff's Virgin Soil.
Finally comes the Anthropozoic or Quaternary age, the age of man, three hundred thousand years, with not much addition to the sedimentary rocks. Man seems to be the net result of it all, of all these vast cycles of Palaeozoic, Mesozoic, and Caenozoic life. He is the one drop finally distilled from the vast weltering sea of lower organic forms.
Succession implies time; the lower members of a series of sedimentary rocks are certainly older than the upper; and when the notion of age was once introduced as the equivalent of succession, it was no wonder that correspondence in succession came to be looked upon as a correspondence in age, or "contemporaneity."
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