How is absolute dating used to evaluate geologic time
In other words, the fossil species must have had a short temporal range.
The most useful indication of time equivalence is similar fossil content, provided of course that such remains are present.
Nevertheless, there is no greater testimony to the validity of fossil-based stratigraphic geology than the absolute dates made possible through radioactive measurements.
Almost without exception, the relative order of strata defined by fossils has been confirmed by radiometric ages.
In addition, its fossilized population should be sufficiently abundant for discovery to be highly probable.
Such an array of attributes represents an ideal, and much stratigraphic geology is rendered difficult because of departure of the natural fossil assemblage from this ideal.