The Palaeozoic has been broken down into six smaller units of geological time called periods. Cambrian is the oldest period of the Palaeozoic followed successively by Ordovician, Silurian, Devonian, Carboniferous and Permian Periods.
Evidence of abrupt change — on a geological time scale — wrought by human hands would seem to be overwhelming.
There were many hydrocarbon plays with long geological time span in the western part of Pearl River Mouth Basin. The major plays were different from one structural zone to another.
Ever since people had begun to catalog the strata in particular outcrops, there had been the hope that these could somehow be used to calculate geological time.
The sudden appearance of abundant and varied fossils makes a worldwide time line for dividing the geological time scale into two main parts.
It's equally hard to fathom the ages of geological time that drive evolution or to directly see the folding and unfolding of DNA on an everyday basis.
In the 18th James Hutton opened up depths of geological time that dwarf the narrow now.
In terms of geological time scales, the whole process was lightning-fast.
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