I knew that Cambrian was older, so decided to go to Wiki. It has an excellent graphic for earth history buffs. Unfortunately the graphic refused to print here, so below is the link. Maybe someone else knows how to make it print, it is a beauty. It shows that 360 mya was at the end of the Devonian and start of the Carboniferous. So that meteor strike probably did cause the significant break between these two.
http://en.wikipedia.org/wiki/Geologic_time_scale