>Dr.W.Widdansen said that such cupmarks were seen on many churches in Germany, and on other buildings besides. Apparently they were made to obtain stone dust for medicinal purposes.<
That might tie in with Layamon's poem <b>Brut</b> from AD1200 describing Stonehenge -
The stones are great
And magic power they have
Men that are sick
Fare to that stone
And they wash that stone
And with that water bathe away their sickness