April 22, 2002

A couple of weeks ago, you learned how to tell how old things are.

This week and next week, you will be learning how scientists think the Earth has changed over time, by looking at rocks and fossils and by using the present as the key to the past.

The class' task: Make a scale model of the geologic time scale. Each group will contribute a portion to this scale.

On the scale, 1 cm will stand for 1 million years.

Here are the links to help you construct your portion of the scale:

The Full Geologic Time Scale - No matter what else you find on the web, use the dates here on the scale. Plus, there are some great links from this page. "Mya" stands for "Million years ago."

Precambrian Time

Hadean Era	Archaean Era
Proterozoic Era

Paleozoic Era

Cambrian Period	Ordovician Period
Silurian Period	Devonian Period
Mississipian Period	Pennsylvanian Period
Permian Period

Mesozoic Era

Triassic Period	Jurassic Period
Cretaceous Period

Cenozoic Era

Tertiary Period

Paleocene Epoch	Eocene Epoch
Oligocene Epoch	Miocene Epoch
Pliocene Epoch

Quaternary Period

Pleistocene Epoch

Holocene Epoch

Hadean Era

Introduction to the Hadean
The Hadean Era

Archaean Era

The Archaean

Proterozoic Era

Introduction to the Vendian Period
The Proterozoic Era
Vendian Animals

Paleozoic Era

Paleozoic Extinctions

Cambrian Period

Cambrian Period

Burgess Shale

Cambrian Paleogeography

Burgess Shale fossil

When Life Exploded

Ordovician Period

Ordovician Paleogeography

The Ordovician

Silurian Period

Silurian Paleogeography

The Silurian Period

The Silurian

Virtual Silurian Reef

Devonian Period

Devonian Paleogeography

Devonian Age in Kentucky
The Devonian
Mississipian Period

Early Carboniferous (Mississippian)

Mississippian Paleogeography

The Carboniferous Period

The Carboniferous

Pennsylvanian Period

Pennsylvanian Paleogeography

The Carboniferous Period

The Carboniferous

Permian Period

The Permian Period

The Permian
Yale Peabody Museum The Mural, Permian
Permian Paleogeography

Mesozoic Era

Introduction to the Mesozoic Era

Mesozoic Era
The Mesozoic
World Book Mesozoic Era
BBC - Walking with Dinosaurs

Triassic Period

The Triassic Period

Triassic Paleogeography

Jurassic Period

Jurassic Paleogeography

The Jurassic Period

Cretaceous Period

The Cretaceous

Cretaceous Period

Cenozoic Era

Cenozoic Era
Introduction to the Cenozoic
World Book Cenozoic Era
Human Evolution
Walking With Prehistoric Beasts
Walking with Beasts (BBC)
BBC - Beasts

Tertiary Period

Horse Evolution

Tertiary Paleogeography

Paleocene Epoch

Paleocene mammals of the world

Paleocene Age of Mammals

Eocene Epoch

The Eocene Epoch

Eocene Age of Mammals

Oligocene Epoch

The Oligocene Epoch

Oligocene Age of Mammals

Miocene Epoch

The Miocene Epoch

Miocene Age of Mammals

Pliocene Epoch

The Pliocene Epoch

Pliocene Age of Mammals

Quaternary Period

The Quaternary Period

Britannica.com

Quaternary Period

Pleistocene Epoch

Land of the Mammoth

FLMNH Pleistocene Page

Neanderthal

NMU Pleistocene Page

Pleistocene Art

Pleistocene Animals

The Midwest at 16,000 Years Ago

Holocene Epoch

The Holocene Epoch - the modern age