The ratios of strontium isotopes in fossil shark teeth can be used to better understand how coastal environments evolved in ...

Roughly half a million years ago, a group of armadillo-like mammals, horses, and sloths met their end in a sinkhole in what ...

Remarkably, fossil shark teeth are also incredibly abundant ... scientists could estimate the age of the sites based only on mammal fossils. The sites were thought to be the same age.

Fossil collectors in Florida have discovered an ancient sinkhole, now at the bottom of a river, which holds the remains of animals rarely seen in the state, including a type of giant armadillo, giant ...

The age of the teeth helped to clarify the age of the ... scientists could estimate the age of the sites based only on mammal fossils. The sites were thought to be the same age.