That old un-conformist Hutton

Edinburgh can be seen as the birthplace of the science of Geology, where Hutton first published his controversial theories, challenging the orthodoxy that the Earth was only a few thousand years old. He was inspired by numerous geological features, but one of them can be seen in Holyrood Park in Edinburgh, home to the extinct volcano Arthur's Seat.

Here a section of older sedimentary rock can be seen curling up into a massive vein of intruded basalt above it. It is called Hutton's Section, or Hutton's unconformity, after he persuaded the quarrymen at the time to work around it and leave it intact.
Behind this feature is Arthur's Seat - the basaltic plug from an ancient volcano. Using this rock as the base for the glaze and every other material, including the clay, I made this 'Edinburgh' pot.