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Updated: June 19, 2025
Inasmuch as these animals can be proved to have been alive in the Carboniferous epoch, it is perfectly clear that, if the Miltonic account is to be accepted, the huge mass of rocks extending from the middle of the Paleozoic formations to the uppermost members of the series, must belong to the day which is termed by Milton the sixth.
Deposition now gave place to erosion. The sedimentary record of the Paleozoic was closed, and after an unknown lapse of time, here unrecorded, the annals of the succeeding era were written under changed conditions. In western North America the closing stages of the Paleozoic were marked by important oscillations.
On the western side of the continent a narrow land occupied the site of the Sierra Nevada Mountains. Thus, even at the beginning of the Paleozoic, the continental plateau of North America had already been left by crustal movements in relief above the abysses of the great oceans on either side. The mediterraneans which lay upon it were shallow, as their sediments prove.
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