There are four types of fossils: mold fossils, cast fossils, trace fossils and true form fossils. Fossils are divided into two distinct categories: fossilized body parts, such as teeth, claws, bones and embryos, and foss... More »

Four types of fossil fuels include the traditional fossil fuels of oil, coal and natural gas, and a third propriety fuel developed by British Petroleum known as Orimulsion. Fossil fuels are found within the Earth and are... More »

More than any other type of fossil, index fossils define geological time periods for geologists by providing the most useful information about the age of the rock they are found in. Index fossils are also called key foss... More »

Five of the most common types of fossils include mold and cast, trace, body, compression and petrifaction. Each type of fossil forms differently and is preserved by more than one method. More »

Discovering Fossils states that the conditions necessary for fossil formation include rapid burial, ample sediment accumulation and eventual bedrock uplift. Time is also an important factor because fossils develop over m... More »

Fossils, embryos and other clues provide evidence that fish evolved before birds. The evolutionary record indicates that limbs and wings developed over millions of years after fish evolved. More »

If the Earth were to suddenly stop spinning, it would be the high winds, rather than gravity, that would immediately remove all traces of life from the Earth's surface. Thankfully, there is virtually no chance of the Ear... More » Science Earth Science