ANSWERS: 2
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This link may help; https://publicaffairs.llnl.gov/news/news_releases/2006/NR-06-03-09.html
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I assume that this is for a project. 430 million years would roughly place you in the Silurian period (give or take a few million years). This is the best pic I can come up with (and it's just a graph, and one that you can't necessarily say is accurate due to differences in opinion of the events that happened around that period). http://1.bp.blogspot.com/_m3-JLA7X59Q/R6vdyw-kEAI/AAAAAAAAAAg/CMbvrvLXpU8/s400/112747981_6990ff2b33_o.jpg Just before the beginning of the Silurian period, came the Ordovician extinction event (or more formally known, the 2nd mass extinction event). If you believe the gamma ray burst theory, then you'd need to consider that more than half of what would be the Earth's ozone layer would've been destroyed. As far as understanding how long it would take for the ozone layer to recover, this is a little bit out of my league to even speculate. I hope you can find a better image.... :D
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