How are fossils dated? They are dated by the layer or strata of rock in which they are found. How is a strata of rock dated, geologists date the rock strata by the fossils found within it. Please excuse me if I find that this circular reasoning unconvincing. Then you have what they call anomalies, things that don’t fit, lots and lots of them. For instance, a fossilized tree is found growing through three strata of rock, representing as much as five hundred millions years. That is one old tree! Might we need to take a second look at evolution’s claims to origins? This is Just-A-Minute.