Dolerite , on NE face of Pen Anglas headland .
Showing the 4 , 5 , 6 sided cooling joints of the columns - " Penny Loaves ".
Similar to columnar jointed Basalt - Giant's Causeway - Fingals Cave .
The trumpet of a foghorn can be seen protruding from the top of a nearby
building from this location.
Location: SM 949 405