A quick analysis of the 2 burnt pieces 1/looks like the burn marks occured before they were shattered. 2/the heat source was intense and of a short duration as internal structure not melted.3/ the heat source effected both sides equally 4/burn marks show unequal burn intensity, blowtorch effect.5/as both pieces were found on different beaches unlikely they were burnt in a fisherman's beach fire.
Last edited by birdspeed; 15th Sep 2016 at 07:42.