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Paul is qu ite right: I wrote Ga (billion years) when I meant
Ma (million years). I notice some of you guys have written
ma or my to mean million years. The lower case "m" really
means milli, so that "ma" meanss a thousandth of a year, or about
8 hours. "M" means mega, or million, "G" means giga, or billion.
The terminal Permian was at 284 Ma.
One of th ese days I must l earn how to edit these things.
>From: David Brez Carlisle