Can radiocarbon dating be used on rocks fail blog dating website
This is difficult for some time periods, however, because of the barriers involved in matching rocks of the same age across continents.
Family-tree relationships can help to narrow down the date when lineages first appeared.
For example, if fossils of B date to X million years ago and the calculated “family tree” says A was an ancestor of B, then A must have evolved earlier.
Stratigraphy and biostratigraphy can in general provide only relative dating (A was before B), which is often sufficient for studying evolution.
There are several different methods for estimating the ages of fossils, including: Paleontologists rely on stratigraphy to date fossils.
Stratigraphy is the science of understanding the strata, or layers, that form the sedimentary record.
If a fossil is found between two layers of rock whose ages are known, the fossil’s age is thought to be between those two known ages.
Because rock sequences are not continuous, but may be broken up by faults or periods of erosion, it is difficult to match up rock beds that are not directly adjacent.