Fossils - Chapter 8

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Vocabulary terms for Unit assessment

mold

The hollow space that is left after an organism's remains dissolve.

absolute age

The age of a rock in years.

index fossil

A fossil that lived in many places around the world for a short period of time; it can help scientists find the age of a rock layer that may be out of order.

paleontologist

Scientists who study fossils and compare them to living things today.

trace fossils

A type of fossil formed when an animal's footprint hardens in sediment.

relative age

The age of a rock compared with ages of other rocks.

petrified

A type of fossil formed when minerals may slowly seep into the remains of living things, such as wood, and harden into a rocklike fossil.

carbon film

A thin coating of carbon that is left behind by a living thing.

fossil

The preserved remains or traces of past life found in some rocks.

amber

Hardened tree sap; can preserve a whole animal

Pangea

One huge landmass; all of the current continents were together.

cast

A type of fossil formed when minerals fill the space left after an organism's remains dissolve.

sedimentary

The type of rock where most fossils are formed.

lowest layer

Where would you find the oldest fossils

millions of years

some animals haven't changed

the sea

When fossils of water creatures are found in land areas, you know the area was once. . .

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