The great extinctions in geologic history

Seems to me that this topic deserves it's own line of discussion, so I'm bringing this over from message 67 of the "Is the Global Flood Feasible? Discussion Q&A" string.See "The Five Worst Extinctions in Earth's History" at:
http://www.space.com/scienceastronomy/planetearth/extinction_sidebar_000907.htmlMoose------------------
Old Earth evolution - Yes
Godly creation - Maybe

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Originally posted by TrueCreation:
What evidence is there that these impacts did indeed have to happen only during the Permian-Triasic, and other geologic periods, and not other periods in geologic time? Besides that we see declines in animal populations after certain periods in the geologic column as most people would indicate as 'extinctions'.

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I don't really see the point behind this question. That impacts have been implicated in the great extinctions that define the ends of the Paleozoic and Mesozoic periods, makes no comment about the happenings of other impacts at other times.Certainly other impacts have happened. Seemingly, any others that happened in the Phanerazoic were not of as great a magnitude as the two noted above.Side note: Strong evidence indicates that an extra-terrestrial object impact was behind the formation of the great nickel deposit at Sudbury, Ontario, Canada. This happened in the pre-Cambrian, before significant life was on Earth.Moose------------------
Old Earth evolution - Yes
Godly creation - Maybe{Edited to unbold the text. - Moose}This message has been edited by minnemooseus, 11-26-2005 12:53 PM