Geological history of Earth The geological history of Earth follows the major events in Earth s past based on the geological time scale, a system of chronological measurement based on the study of the planet s rock layers stratigraphy.Earth formed about . billion years ago by accretion from the solar nebula, a disk shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of Geological History of Oxygen HHMI BioInteractive Today, oxygen, or O , makes up about % of Earth s atmosphere, but for most of our planet s long history, O levels in the atmosphere and dissolved in the ocean were much less than they are today In this Click and Learn, you will learn the complex biological and geological factors that have Geological History of the Blue Mountains Secrets Underground Beyond the township of Kurrajong, Bells Line of Road winds along an isolated ridge from Kurrajong Heights, through Bilpin, Berambing and Mt Tomah and on to Lithgow in NSW, Australia. Geologic time scale The geologic time scale GTS is a system of chronological dating that relates geological strata stratigraphy to time.It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth s history.The table of geologic time spans, presented here, agree with the nomenclature, dates and standard color codes set Niagara Falls Geology Geological History, Facts Find Geology and Geological History of Niagara Falls The Story of the Falls began million years ago The future site of the Great Lakes stood at the centre of a broad, shallow sea that covered much of North America Niagra Falls, Ontario, Canada Niagara Falls Origins a Geological History A GEOLOGICAL HISTORY Last updated on Sunday June , The following locations and facts about them are but a few of many famous sites attractions to be found in Niagara Falls. Geology Home Western Washington University DISCOVER LINKS Geology History Bird List Plant List Top Locations Geology The Chuckanut Formation Fifty million years ago, during the Eocene period, in a time before the Cascades were formed, a giant swampy flood plain and river system covered most of the Pacific Northwest, from the southern part of Canada to where Everett sits today. Geology of Kentucky, Kentucky Geological Survey site Geology of Kentucky, kentucky geological survey KGS Home Geology of Kentucky If you see an image you like, right click and Save picture as to your computer History of Life Across Geological Time FOSSIL MALL Cretaceous to ma Upper End Cretaceous extinction event annihilates all non avian dinosaurs and ammonites % of all species, % of genera and % of families meet extinction. Geologic time scale UCMP Online exhibits Geologic time scale Take a journey back through the history of the Earth jump to a specific time period using the time scale below and examine ancient life, climates, and geography.