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Wallington Hall

Wallington stone

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Here's one with grooves that have then eroded ! ( http://www.themodernantiquarian.com/post/12251 ) Millstone Grit erodes far less. The stone walls turn to sand, incidentally, which is usually washed away. Wonder if the geologist has an estimate for lifetime of the known oil reserves.

Y'areet SL?

Why wait 'till winter for Bygate? Howay up there this summer, and I'll show you the naturally eroded outcrops where all those stones were quarried. Shaftoe crags. It's a good place.

I spoke to our geologist who came down on the side of weathering.
I can see his point, for example if you took a lovely piece of gritstone like this one http://www.themodernantiquarian.com/post/27232 and upended it to create a standing stone, the horizontally weathered bedding planes would then become vertical, this would definately help to excellerate the erosion process.

When is the oil going to run out?
Tomorrow!