Ammonite shells are used today as index fossils, meaning they can help date other fossils that are found in the same layer of marine rock. These cephalopods make for ideal index fossils because ...

To find answers, a team of researchers studied North America’s fossil record, focusing on the 18 million years before the mass extinction at the end of the Cretaceous period. The new analysis ...

Have them include at least 3 events from the class list and at least 3 events not on the class list. I have my students use a ruler to space years accordingly. An Index fossil is any animal or plant ...

Because some ammonites only lived during specific periods, when geologists find such fossils, they know the age of the ...

March 12 (Reuters) - Scientists have unearthed in Spain fossilized facial bones roughly 1.1 million to 1.4 million years old that may represent a previously unknown species in the human ...