Methods of absolute fossil dating
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.
To this day, fossils are useful as correlation tools to geologists specializing in stratigraphy.Unlike the principles of superposition and crosscutting, faunal succession is a secondary principle.That is to say, it depends on other sequence-determining principles for establishing its validity.Using fossils simply for identification purposes, Smith constructed a map of the various surface rocks outcropping throughout England, Wales, and southern Scotland.Smith’s geologic map was extremely crude, but in its effect on Earth study it was a milestone.
Failing that, the repetition of a certain layered sequence (e.g., a black shale sandwiched between a red sandstone and a white limestone) lends confidence to physical correlation.