Photos of the fossil — yes, it’s assumed to be a fossil — were ... Response to the post has been muted, but some suggest it’s ...

Sharks have ruled the Earth’s oceans for 400 million years and recent research on fossilized shark teeth has led to the discovery of an innovative method for dating ancient sediments.

Strontium is also released by deep-sea vents. Geochemist Donald DePaolo ... as well as the age of mollusks and other shell-producing marine fossils. Properly dating ancient sites is key to ...