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Updated: June 19, 2025
Geographical provinces and zones may have been as distinctly marked in the Paleozoic epoch as at present, and those seemingly sudden appearances of new genera and species, which we ascribe to new creation, may be simple results of migration. It may be so; it may be otherwise.
Robert Watts uses these emphatic words: "The record of the rocks know nothing of the evolution of a higher form from a lower form. Neither the paleozoic age nor the living organisms of our world reveal an authentic instance of such evolution. Both nature and revelation proclaim it as an inviolable law that like produces like."
From their bases lowlands extended westward to beyond the Missouri River. At the same time ranges were upridged out of thick Paleozoic sediments both in the Bay of Fundy region and in the Indian Territory. The eastern portion of the North American continent was now well-nigh complete. The date of the Appalachian deformation is told in the usual way.
Don't press him too hard when he is turning a sharp corner. Remember he has a long reach with his old paleozoic tail. Luck!" with a laugh through her tears; a laugh with tremulous cheer in it and yet with the ring of a key in the lock of a gate. Unsteadily he bent over and taking her hands in his pressed his lips to them. "Yes, luck!" he repeated, and half staggering turned toward the defile.
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.
"Do you remember that maniacal creature that attacked our motor-car that time we went to Silver Ranch, years and years and years ago? You know, back in the Paleozoic Age!" "Quite so," agreed Helen. "I have a photographic remembrance of that creature ugh! And how he burst our tires!" "He, forsooth! What a way to speak of a cow!" "It wasn't a cow; it was a steer," declared Helen confidently.
On all sides the borders of this highland area are deeply grooved by numberless streams flowing in narrow gorges. Against its nucleus of very ancient granites and porphyries the Ozark series of magnesian limestone was laid down. Then the area occupied by these rocks was elevated, and around its margins were deposited successively the other members of the Paleozoic.
Turning to the Vertebrata, the only Paleozoic Elasmobranch Fish of which we have any complete knowledge is the Devonian and Carboniferous 'Pleuracanthus', which differs no more from existing Sharks than these do from one another. Decade x.
These are much more advanced and much younger than the lowest vertebrate, the Amphioxus, and the numerous skull-less vertebrates, related to the Amphioxus, that must have lived at that time. The whole of the invertebrate ancestors of the human race must have preceded these. The primordial age is followed by a much shorter division, the paleozoic or Primary age.
The leading events of the long ages of the era we can sketch only in the most summary way. In eastern North America the Mesozoic rocks are much less important than the Paleozoic, for much of this portion of the continent was land during the Mesozoic era, and the area of the Mesozoic rocks is small.
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