Unit 5 Lesson 1 What is a Fossil?

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index fossil

A fossil of a type of organism that lived in many places during a relatively short time span.

Pangae;

Long ago, all of Earth's land formed one giant continent.

What features of the fossil might help you determine what kind of fossil it is?

Look at its size, shape and parts

Era

A major division of geological time composed of a number of periods and is marked by distinctive character or events.

cast

A model of an organism, formed when sediments fills a mold and hardens.

mass extinction

A period in which a large number of species become extinct.

period

A series of years by which time is measured.

fossil record

All the fossils in Earth's rock layers containing information about Earth's history and the history of life on Earth.

mold

An impression of an organism, formed when sediment hardens around the organism.

Geologic Time Scale

Divides earth's history into manageable units. The fossils each unit contains defines that unit.

living fossils

Organism that look as if they have not change much over time.

Relative age

The age of a layer of rock when you compare it to other layers.

eon

The largest division of geologic time is an indefinitely long period of time.

What might a scientist infer from a plant that has remained unchanged for a long time?

The plant existed in an area that had a very stable environment.

fossil

The remains or traces of a plant or animal that lived long ago.

paleontology

The science of the forms of life existing in former geologic periods, as represented by their fossils.

Which type of fossil would more closely resemble how an organism looked in life - a mold or a cast?

a cast would more closely resemble how an organism looked.

epoch

any of several divisions of a geologic period during which a gelogoic series is formed. A point of time distinguished by a paricular event or state of affairs.

Ohio fossils are

brachiopod, cephalopod, trilobite, and horsetail plant fossils

What happens to living things when they die?

decompose, wash away, get eaten or get buried

Most fossils are found in

sedimentary rock.

Trace Fossil

shows how an organism lived.

Fossils help us

understand Earth's history.


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