Millions of Years Ago	Event
4600   3900   3800   2000   900   700   510   458   375   300   245   200   160   130   100   65   50   36   26   3.4   2   .600   .100   .015   .007   .000503   _________	Origin of the Earth   Oldest dated crustal rocks   Oldest evidence for life   First oxygen atmosphere/ozone layer forms   Oldest Metazoan fossils   First invertebrates   Oldest fossil fish   First land plants   Amphibians evolve   Island Arc in the Pacific that eventually becomes part of the Wrangellian Terrain forms   Huge mass extinction at the end of the Permian Period   First mammals   First birds   Angiosperms (flowering plants on the scene)   Wrangellian Terrain crashes into North American continent   Dinosaurs go extinct   Whales first appear in the oceans   Cascade Mountain Range begins to form   Yukatan Terrain crashes into Wrangellian Terrain   New discoveries of Australopithecus afarensis fossils (LUCY)   Pleistocene Ice Age begins   Age of Homo erectus fossils from Ethiopia   Homo sapiens appears in the fossil records   Last ice sheet retreats from Ohio   Grahams Harbor, San Salvador, Bahamas flood due to rising sea level after ice sheets are reduced to modern day volume   Columbus lands in the New World   Your birthday
Adapted from: "Geologic Time Scale Analogy". R. Hays Cummins, Interdisciplinary Studies, Miami University. 4/15/97. http://jrscience.wcp.muohio.edu/lab/GeoTime.html