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FOSSILS: how fossils are dated

Many times paleontologists will never know exactly how old a fossil is. Usually they guess its range or span of time. A good way of guessing the range is to look at the layers of rock that were formed by volcanoes. It's easier to guess the age of volcanic rock because it's brand new rock from the moment that it is spit onto the earth's surface. Many times paleontologists will never know exactly how old a fossil is. Usually they guess its range or span of time. A good way of guessing the range is to look at the layers of rock that were formed by volcanoes. It's easier to guess the age of volcanic rock because it's brand new rock from the moment that it is spit onto the earth's surface. Other dinosaurs... ARCHEOPTERYX:    • ARCHAEOPTERYX - the jurassic period   DATING FOSSILS:    • FOSSILS: how fossils are dated   DESMATOSUCHUS:    • DESMATOSUCHUS - the triassic period   EORAPTOR:    • EORAPTOR - the triassic period   MAIASAUR:    • MAIASAUR - the cretaceous period   SALTOPUS:    • SALTOPUS: the triassic period   STEGOSAURUS:    • STEGOSAURUS - the jurassic period   SUPERSAURUS:    • SUPERSAURUS - the jurassic period   TRICERATOPS:    • TRICERATOPS - the cretaceous period   TYRANNOSAURUS REX:    • TYRANNOSAURUS REX: the cretaceous period   WHAT ARE FOSSILS?    • WHAT'S A FOSSIL?   WHAT IS EVOLUTION?    • WHAT IS EVOLUTION?   WHAT IS PALEONTOLOGY?    • WHAT IS PALEONTOLOGY?