Just north of Dunstanburgh Castle, you'll find Greymare or Saddle Rock, a fascinating geological feature situated in a rocky bay.
Comprised of a series of limestone beds extending into the sea amidst dolerite boulders, the rock's upper surface showcases a polished appearance due to wave action.
This unique formation boasts a twisted, wave-like shape resulting from the heat and pressure generated during the creation of the nearby Whin Sill.
Approximately 300 million years ago, a significant geological event occurred here, known as a Sill, where a horizontal sheet of magma, resembling a volcano's sideways flow,
forcefully infiltrated between existing layers of rock strata. As you gaze upon the exposed rock, shaped like a wave, you may envision the grey mares or white horses described
in folk tales, believed to gallop alongside breaking ocean waves or accompany the ancient pagan gods of the sea.