Geologic Eras

Geological Time Scale

http://www.geo.ucalgary.ca/~macrae/timescale/timescale.html

Geologic Time (USGS)

http://pubs.usgs.gov/gip/geotime/

Web Geological Time Machine

http://www.ucmp.berkeley.edu/help/timeform.html

Geologic Time Table

http://www.geo.wvu.edu/~wilson/geol1/lec43b/EHist1.htm

Toilet Paper Geologic Time Scale (Learning Activity)

http://www.nthelp.com/eer/HOAtimetp.html

Making the Geologic Time Scale Real (Learning Activity)

http://www.accessexcellence.com/AE/AEPC/WWC/1991/geologic.html

Paleozoic Era (Earth and Space Science for Middle School Teachers)

http://www.gpc.edu/~pgore/Earth&Space/paleozoic.html

A Chart of Geologic Time from a Trilobite's Point of View

http://www.trilobites.info/geotime.htm

Evolutionary Clocks

The Age of the Earth FAQS

http://www.talkorigins.org/origins/faqs-youngearth.html

Radiometric Dating and the Geologic Time Scale

http://www.talkorigins.org/faqs/dating.html

Radiometric Time Scale

http://pubs.usgs.gov/gip/geotime/radiometric.html

Radiometiric Dating

http://www.gpc.edu/~pgore/geology/geo102/radio.htm

Geologic Time and the Rock Record

http://www.geology.ucdavis.edu/~cowen/~GEL107/timeandrecord.html

Geologic Time Scale

http://www.mcz.harvard.edu/Departments/InvertPaleo/Trenton/Intro/GeologyPage/
Geologic%20Setting/geologictime.htm

Age Dating: Educational Resources for K-16

http://www.uky.edu/KGS/education/agedating.html

Plate Tectonics

Introduction to Plate Tectonics

http://volcano.und.nodak.edu/vwdocs/vwlessons/plate_tectonics/introduction.html

An Introduction to Plate Tectonics

http://www.hartrao.ac.za/geodesy/tectonics.html

Plate Tectonics (Wikipedia)

http://en.wikipedia.org/wiki/Plate_tectonics

An Introduction to the ABC's of Plate Tectonics

http://webspinners.com/dlblanc/tectonic/ptABCs.php

This Dynamic Earth (USGS)

http://pubs.usgs.gov/gip/dynamic/dynamic.html

Plate Tectonics Animations

http://www.ucmp.berkeley.edu/geology/tectonics.html

Plate Tectonics and Sea Floor Spreading

http://vulcan.wr.usgs.gov/Glossary/PlateTectonics/framework.html

Extinctions

Teaching Documents about Mass Extinction Events

http://www.uni-wuerzburg.de/mineralogie/palbot/teach/extinctionteach.html

The Late Cambrian Extinction (BBC Education)

http://www.ecology.com/archived-links/cambrian-extinction/index.html

Extinctions: Cycles of Life and Death Through Time

http://park.org/Canada/Museum/extinction/tablecont.html