PHOTO DRUMADOON SILL THIS IS A GEOLOGICAL SILL THIS MEANS IT'S A LOAD OF IGNEOU
£2.15
SO THE TOP AND BOTTOM OF THE SILL IS BASALT WHILE THE MIDDLE IS QUARTZ FELDSPAR PORPHYRY (QFP). THE OTHER CRYSTALS ARE SMALL AS THEY HAVE HAD TO COOL QUICKLY. THE SURROUNDING BED ROCK HAS ERODED AWAY REVEALING THE SILL.
