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Such exact repetitions, however, of the same mixtures of sediment have not often been produced, at distant periods, in precisely the same parts of the globe; and even where this has happened, we are seldom in any danger of confounding together the monuments of remote eras, when we have studied their imbedded fossils and their relative position.
It may be well to mention one more illustration of the manner in which single fossils may sometimes throw light on a former state of things, both in the bed of the ocean and on some adjoining land. We meet with many fragments of wood bored by ship-worms at various depths in the clay on which London is built.
He was dog-tired but before he slept he walked around the little pool. He had heard of fish being found in underground caverns or even the fossils of things that had once been there. But here Odin found no sign of life. Nothing except traces of the vast underground river that must have once swept through here long ago.
That it would prefer to associate with the meanest Troglodite, rather than appear amongst the present company. I understood it to say," continued the Kangaroo Rat, "that real law could only be understood by those deeply learned in fossils." "'Pon my word!" ejaculated the Judge. "Shiver my timbers! What blooming impudence!" "Oh! you naughty bird to use such words!" exclaimed Dot.
If you had been looking at fields and hedgerows all the while, you would have thought no time at all had passed. What curious sandy rocks on each side of the cutting, in lines and layers. Those are the freestone still: and full of fossils they are. But do you see that they dip away from us? Remember that.
==Significance of these Sources of History.== The real force of these sources of evidence comes to us only when we compare them with each other. They agree in a most remarkable fashion. The history as disclosed by fossils and that told by embryology agree with each other, and these are in close harmony with the history as it can be read from comparative anatomy.
I came thus to know Charles T. Jackson, Jules Marcou, and, later, the brothers Rogers, Henry and James. At the same time I kept up the study of zoology, undertaking to make myself acquainted with living organic forms as a basis for a knowledge of fossils.
DEPOSITION OF SEDIMENTS AND SUBSIDENCE. The stratified rocks of the land show in many places ancient sediments which reach a thickness which is measured in miles, and which are yet the product of well-nigh continuous deposition. Such strata may prove by their fossils and by their composition and structure that they were all laid offshore in shallow water.
They are only a small part of the total thickness of aqueous deposit of stratified rock which amounts to 60,000 feet more before the earliest remains of life in the Cambrian beds are reached, whilst older than, and therefore below this, we have another 50,000 feet of water-made rock which yields no fossils no remains of living things, though living things were certainly there!
The predominance in earlier ages of these mammalia of a low grade, and the absence, so far as our investigations have yet gone, of species of higher organisation, whether aquatic or terrestrial, is certainly in favour of the theory of progressive development. Line of Separation between Mesozoic and Palaeozoic Rocks. Distinctness of Triassic and Permian Fossils. Term Permian.
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