Warren said:
ALL trilobites were killed off in the Cambrian extinction, about 500 MY ago.
This is not true. As Leonard said, the trilobites were wiped out by the end-Permian mass extinction. An excellent account of the evolutionary history of trilobites can be found in Richard Fortey's book _Trilobite!_, which I reviewed a few years ago:
http://www.theculture.org/rich/sharpblue/archives/000073.html Rich _______________________________________________ http://www.mccmedia.com/mailman/listinfo/brin-l
