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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.
This is difficult for some time periods, however, because of the barriers involved in matching rocks of the same age across continents.
Despite being relatively common, though, we can still learn some amazing things from it.
For our first entry of our new science video series, we looked at some one-of-a-kind hardware that gets things moving at nearly the speed of light.