What is a Saddle Stone?

Question

What is a Saddle Stone?

Answer 1

Saddle Stones

Concave stones, known as saddle stones, were used by many cultures and numerous fine examples still exist today. Grain placed on the bowl like stone would be pulverised by moving a second stone backwards and forwards by hand. Experimentation with the shape of the top crushing stone eventually led to the development of a round stone used in a circular motion and the development of the Quern.

The saddle-stone is the connecting link between the primitive pounder, or muller, and the quern,

As far as i can find  a Saddle Stone has nothing to do with horses, Though i did read somewhere, some one said it was a rubber stone used to clean saddles without dampening them? .... Maybe i'm all together wrong lol