They have not yet been found in the fossil record.

They are not known to be present in the fossil record.

But the fossil record doesn't show the sort of behavior we're seeing here.

Find out what Earth's fossil record may be telling us about our future.

The older the fossil record gets, the more difficult it is to read.

A further two species are known from the fossil record.

They are also known from Europe in the fossil record.

There are more species to be found in the fossil record.

He thinks, This is the fossil record of our lives.

This view is supported by the fossil record and other evidence.