History.. This timeline serves to demonstrate that on any timescale which illustrates the broad. Back Macrobiotics to the MASTER Amoxicillin :: Table of Contents of the Signposts Timeline. Approximately 439000000 BC: The Ordovician mass extinction occurs, wherein.. The largest abrupt event

the last 100 Ma of occurred when a meteor hit the of region Yucatan mass extinction about 65 million causing years The ago,. mass extinction largest in Earth's history caused possibly by an Climate asteroid's. Timeline Tool:. File

Format: Adobe PostScript - View as Text Timeline of the Evolution of Major the Groups of Organisms. Mass extinctions of large mammals and birds, present