The ratios of strontium isotopes in fossil shark teeth can be used to better understand how coastal environments evolved in ancient times, according to our newly published work in Palaeogeography, Palaeoclimatology, Palaeoecology. The ratios of strontium isotopes in fossil shark teeth can be used to better understand how coastal environments evolved in ancient times, according to our newly published work in Palaeogeography, Palaeoclimatology, Palaeoecology. Evolution Paleontology & Fossils Phys.org – latest science and technology news stories