These are lavas erupted in the Old Red Sandstone (Devonian) era more than 400 million years ago, and predate the Carboniferous volcanoes that produced familiar features such as Bass Rock, N Berwick Law and Arthur's Seat among others. These Devonian lavas are well seen a few km to the NW on the coast at St Abb's Head.
Uploaded to Geograph by Jim Barton on 4 September 2012
Photo © Jim Barton, 4 September 2012. Licensed for reuse under this Creative Commons licence