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The Altar Stone was believed to be from old red sandstone in south Wales - rocks that extend in the east across Britain.

Now Aberystwyth scientists have compared analysis of the Altar Stone with 58 samples of old red sandstone from across Wales and the Welsh borders.

When Matthias arrived at the wall he felt like patting the old red sandstone.

At the time, this terrain lay far from the arctic, at lower latitudes, locked in the arid interior of a landmass called the Old Red Sandstone Continent.

Then Abner Dean of Angel's raised a point of order, when A chunck of old red sandstone took him in the abdomen, And he smiled a sickly smile, and curled up on the floor, And the subsequent proceedings interested him no more.