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Puckett, T. M. Santonian–Maastrichtian planktonic foraminiferal and ostracode biostratigraphy of the northern Gulf Coastal Plain, USA.

That technique is known as biostratigraphy, and it is typically much less accurate than methods such as uranium-lead dating.

Their method, known as biostratigraphy, allows geologists to assign relative ages to rocks based on the types of fossil creatures found within them.

This is because the rocks have been dated using only biostratigraphy, a process in which paleontologists compare the fossils preserved in a rock unit of uncertain age with rock units of known age that preserve similar fossils.