
	Where results make sense

Topic: Orosirian

In the News (Mon 6 Jul 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Orosirian - Palaeos (Site not responding. Last check: 2007-10-13)
		The Orosirian (from Greek orosira, "mountain range") is the third geologic period in the Paleoproterozoic Era and lasted from 2050 Ma to 1800 Ma (million years ago).
		Probably during this period Earth's atmosphere changed to oxygen-rich due to photosynthesis of cyanobacteria.
		At the very beginning of the period, 2023 Ma, a large asteroid collision created the Vredefort impact structure.
	www.palaeos.org /Orosirian (140 words)

	Pharyngula: Age of the Earth
		Also, the Ediacaran is the most recently fully approved one, but there are a whole passle of new Periods in the works.
		From oldest to youngest, they are: (for the Paleoproterozoic Era) Siderian, Rhyacian, Orosirian, Statherian; (for the Mesoproterozoic Era) Calymmian, Ectasian, Stenian; (for Neoproterozoic Era) Tonian, Cryogenian, Ediacaran.
		Comments are moderated for spam, your comment may not appear immediately.
	scienceblogs.com /pharyngula/2006/07/age_of_the_earth.php#more (2887 words)

	Geological Society - Teaching Resources - Mnemomania
		Thomas Holtz (University of Maryland) has created the following mnemonic for the proposed new Proterozoic Periods:
		For: Siderian Rhyacian Orosirian Statherian (Paleoproterozoic); Calymminian Ectasian Stennian (Mesoproterozoic); Tonian Cryogenian Ediacaran (Neoproterozoic).
		Phil Plummer CGeol writes: "During my university days (a quarter of a century ago!) the following mnemonic was used for the mineral hardness scale: The Gem Cutters From Adelaide Must Queue To Cut Diamonds, the minerals, of course, being Talc, Gypsum, Calcite, Fluorite, Apatite, Microcline, Quartz, Topaz, Corundum, Diamond."
	www.geolsoc.org.uk /template.cfm?name=Mnemonics (1169 words)

Try your search on: Qwika (all wikis)