Grey Mare Stone is a natural boulder that has been used as a boundary marker for many centuries. Although I didn’t spot any particular resemblance in shape to a horse.

There are a whole series of dates carved into the rock, 1745, 1774, 1735 RC / RG, 1713, 1799, 1821, 1844 and a much more recent 1979.

There’s also an “Egton” with a backward N

Many of the dates recorded at the same as Swarth Howe Cross which must mark periods of “beating the bounds“