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Date: 2009-12-30 15:02:33 Gamma-ray burst Ordovician–Silurian extinction event Extinction event Supernova Ordovician GRB 970228 Gamma-ray burst emission mechanisms Astronomy Space Nature		Untitled Add to Reading List Source URL: acdb-ext.gsfc.nasa.gov Download Document from Source Website File Size: 118,96 KB Share Document on Facebook

	COVER A Classopollis meyeriana conifer pollen grain (~30 micrometers across) preserved in lake sediments deposited just after a massive, volcano-induced extinction event ~200 million years ago. This fossilized pollen gr DocID: 1sPbN - View Document
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