Stromatolites at Yesnaby.

The geology at Yesnaby is superb.  Just by the carpark there are some excellent horse-tooth stromatolites (fossilised remains of blue-green algae for the mud flats of Lake Orcadie - Devonian) that show the yearly growth rings, just like trees. These are 400 million years old - and should be left for others to enjoy - sadly there was some evidence of bits being removed.

As you walk along the coast there are plenty of examples of fossilised ripples and cracks in the sediments of Lake Orcadie.

...and some very pretty patterns on which I am planning to do a tapestry weaving.