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Updated: May 27, 2025
At the beginning these injections have been the same as the first massive intrusive rocks, either granite or greenstone; but as the rocks gradually cooled, the fissures reached greater and greater depths; and the lighter constituents having been drawn off and exhausted, only the heavier molten silica, mingled with metallic and aqueous vapours, has been left, and with these the last-formed and deepest fissures have been filled.
Some people there will be who will believe in the original solid rock and its toad, despite the assertion of the geologists that the earliest fossils of toads appear in almost the last-formed rocks, and that a live toad in rocks of very ancient age presuming, according to the popular belief, that the animal was enclosed when the rock was formed would be as great an anomaly and wonder as the mention, as an historical fact, of an express train or the telegraph in the days of the patriarchs.
Sir Charles Lyell perceived similar footprints in the red mud in the Bay of Fundy, which had just been formed by sandpipers; and on examining an inferior layer of mud, formed several tides before, and covered up by fresh sand, he discovered casts of impressions similar to those made on the last-formed layer of mud.
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