The beginning of the Paleozoic Era witnessed the breakup of the supercontinent of Pannotia and ended while the supercontinent Pangaea was assembling.
Also, the brain is contained in a tight membrane called the dura which is, in turn, cushioned by a thin layer of fluid located between it and the skull.
The resulting vibration is received and transmitted into the brain itself via the fluid filled third and left ventricles located above the brain stem.