Robert Holdstock 
Earthwind [EPUB ebook] 

On the planet Aeran, the original colonists have undergone a drastic change: under the influence of some strange psychic force they have forgotten their identity and created a new culture – an exact reconstruction of the Stone Age society that flourished in Ireland 6, 000 years ago.Has some strange racial memory been awakened? Or are both cultures the product of a social blueprint implanted throughout the cosmos by a long-vanished race?