In legal medicine, the post mortem interval (PMI) of interest covers the last 50 years.When only human skeletal remains are found, determining the PMI currently relies mostly on the experience of the forensic anthropologist, with few techniques available to help.

But, how can we determine how old a rock formation is, if it hasn’t previously been dated?

Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.

This gap is from about 40,000 ya (years ago) to about 200,000 ya on the evolutionist's time scale.

Antonio Simonetti, a research associate professor in the Department of Civil Engineering and Geological Sciences at the University of Notre Dame, is the coauthor of an important new paper describing a novel method for age dating dinosaur fossils.

Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.

Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.

Yet, accurate dating of fossils is so essential that the scientific respectability of evolution is contingent upon fossils having appropriate dates.

Popular presentations of human evolution show a rather smooth transition of fossils leading to modern humans.

Recently, several radiometric methods have been proposed to reveal PMI.