I have my students use a ruler to space years accordingly. An Index fossil is any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time ...

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 ...

Fossil species that are used to distinguish one layer from another are called index fossils. Index fossils occur for a limited interval of time. Usually index fossils are fossil organisms that are ...

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

We are collecting and imaging lots of modern and fossil Ginkgo leaves, including leaves submitted by citizen scientists across the nation, in order to help us better understand how variable the ...

SPDR S&P 500 Fossil Fuel Reserves Free allows tracking the S&P 500 excluding companies with fossil fuel reserves. Learn more ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. An almost ...

The University of Cambridge is working with Bloomberg Index Services Limited (BISL) to launch a corporate bond index which ...