Large quantities of prehistoric worked flint, said to number in the thousands, have been observed and collected at Cass ny Hawin.  Material has been observed at various points along the coastal periphery of Ordnance Survey Field no. 2969, and also as a result of ploughing.  The site is now affected by quarrying. Two trial excavations were undertaken by Gelling and Cubbon in 1973 prior to an extension of quarrying in the vicinity. No significant discoveries were made, but an adjoining area to the east requires similar investigation.