Stone Age Selkies?

From a series of stamps from the Faroe Islands depicting legends of the Seal Folk.

"While there is nothing unusual in finding isolated fragments of human bone in Mesolithic deposits, the find at Oronsay was rather out of the ordinary in that, of the forty or so bone fragments recovered, thirty were small bones from the hands and feet, and one of the groups of human finger bones was found to lie on a cluster of bones from a seal's flipper ... [in what] would appear to be a deliberate act of association."

Barry Cunliffe Britain Begins