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Updated: June 19, 2025
In the older tertiaries, the places of existing animals and plants are taken by other forms, as numerous and diversified as those which live now in the same localities, but more or less different from them; in the Mesozoic rocks, these are replaced by others yet more divergent from modern types; and in the Paleozoic formations the contrast is still more marked.
There was no higher, more far-reaching "common good" than this to which acres prepared from Paleozoic days and consecrated of unselfish adventure could be devoted. I cannot find anywhere in our history an appreciation of this particular contribution to the foundation of free institutions in America. But it is one that should be recorded and remembered along with the more tangible contributions.
This one-time bed of the Paleozoic sea between Archaean shores, raised in time above the ocean and enriched of the mountains that through millions of years were gradually to be worn down by the natural forces of the valley, and finally, as we have seen, opened by the French as a new- created world to be peopled by the old world, then overflowing its brim, became all of it in the space of a single lifetime the property of a few million human beings, their heirs, and assigns forever.
Assuming that they did exist, the task of accounting for the mode of occurrence of our auriferous quartz lodes is comparatively simple. Chloride of gold is at present day contained in sea water and in some mineral waters, and would have been likely to be more abundant during the Azoic and early Paleozoic period.
But then, on careful consideration of the facts, the objection arises that the stalk, calyx, and arms of the paleozoic Crinoid are exceedingly different from the corresponding organs of a larval 'Comatula'; and it might with perfect justice be argued that 'Actinocrinus' and 'Eucalyptocrinus', for example, depart to the full as widely, in one direction, from the stalked embryo of 'Comatula', as 'Comatula' itself does in the other.
When the Carboniferous was ended the waste which had been removed from the land and laid along its margin in the successive formations of the Paleozoic had reached a thickness of between thirty and forty thousand feet. Both by sedimentation and by subsidence the trough had now become a belt of weakness in the crust of the earth.
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.
These are lizard-like animals; the first to be discovered was the Proterosaurus, from the marl at Eisenach. The rise of the earliest Amniotes, among which must have been the common ancestor of the reptiles, birds, and mammals, is put back towards the close of the paleozoic age by the discovery of these reptile remains.
Considering the large amount of feldspathic material in these rocks, do you infer that they were derived from the adjacent crystalline and metamorphic rocks of the oldland of Appalachia, or from the sedimentary Paleozoic rocks which had been folded into mountains during the Appalachian deformation?
To the east lay a land which we may designate as APPALACHIA, whose western shore line was drawn along the site of the present Blue Ridge, but whose other limits are quite unknown. The land of Appalachia must have been large, for it furnished a great amount of waste during the entire Paleozoic era, and its eastern coast may possibly have lain even beyond the edge of the present continental shelf.
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