After the last retreat of the ice at the close of the Pleistocene epoch sea levels were up to 70 metres ( 230 ft ) lower than at present .
It is likely that circa 14,000 BP the island was connected to mainland Scotland .
After the last retreat of the ice at the close of the Pleistocene epoch sea levels were up to 70 metres ( 230 ft ) lower than at present and it is likely that circa 14,000 BP the island was connected to mainland Scotland .