| I have brought from that locality a single specimen of pitchstone, perfectly resinous, bleak and shining. |
| Also found was a flake of green Arran pitchstone, thought to be a waste fragment from the manufacture of a tool. |
| The walls, or banks, of the channel have been denuded away, thus converting the pitchstone casting into a projecting wall of rock. |
| In the Neolithic and the Early Bronze Age pitchstone from the Isle of Arran or items made from it were transported around Britain. |
| In the south of the island there are sills and dykes of felsite, quartz-porphyry, rhyolite, trachyte and pitchstone. |
| I strongly suspect the underlying granite has altered such beds into this pitchstone. |
