United States or Gabon ? Vote for the TOP Country of the Week !
The Carboniferous was the age of lycopods and amphibians, as the Devonian had been the age of rhizocarps and fishes. The upridging of the Appalachians had begun and a wide continental uplift proved by the absence of Permian deposits over large areas where sedimentation had gone on before opened new lands for settlement to hordes of air-breathing animals.
I would like to stay and study these people a little while, but we must get back on the trail of the Nevians," and the Boise leaped away into space, toward the line of flight of the amphibians. They reached that line and along it they traveled at full normal blast.
With the uplift at the edges of the continent came a steady rise of the internal marshes, until what had previously been swamp land became progressively first dry land and, in the western part, even desert, in that respect being somewhat like what it is now. This doubtless was true of the amphibians of the coal period.
But I had to point out then that no case was known of "parthenogenesis" that is to say, reproduction by unfertilised eggs among the whole series of vertebrate animals, the fishes, amphibians, reptiles, birds, and mammals.
Regularly, year by year, and in company with the reports of the sea-serpent's reappearance, we may read of the discoveries of toads and frogs in situations and under circumstances suggestive of a singular vitality on the part of the amphibians, of more than usual credulity on the part of the hearers, or of a large share of inventive genius in the narrators of such tales.
Costigan, bitterly resentful of the inhuman treatment accorded the three and fiercely anxious for the success of his plan of escape, held his breath and, grimly alert, watched the amphibians die.
It was raining that morning how many million years ago? as we know from the imprint of the raindrops upon the mud. Probably the shower did not cause him to quicken his pace, as amphibians rather like the rain. Just what his immediate forbears were like, or what the forms were that connected him with the fishes, we shall probably never know.
It is according to the successive stages in the advance of life that the Paleozoic formations are arranged in five systems, the CAMBRIAN, the ORDOVICIAN, the SILURIAN, the DEVONIAN, and the CARBONIFEROUS. On the same basis the first three systems are grouped together as the older Paleozoic, because they alike are characterized by the dominance of the invertebrates; while the last two systems are united in the later Paleozoic, and are characterized, the one by the dominance of fishes, and the other by the appearance of amphibians and reptiles.
When at last the real Atlantic winter had settled down upon the coast, binding it with bitter frost and scourging it with storm, then Captain Ephraim spent most of his time at home in his snug cottage. He had once, on a flying visit to New York, seen a troupe of performing seals, which had opened his eyes to the marvellous intelligence of these amphibians.
In the Cretaceous the teleosts, or bony fishes, made their appearance, while ganoids declined toward their present subordinate place. The amphibians culminated in the Triassic, some being formidable creatures as large as alligators. They were still of the primitive Paleozoic types.
Word Of The Day