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Yes I agree that rotten Cheviot granodiorite (sl) in the North Sea Tills is unlikely. The one pic of a Cheviot granite (sic) from those tills in the literature looks quite unweathered.
You do not mean millions of years?? unless you are going to invoke Kellaway''s Pliocene glaciation. ''Tis but a short hop from there but to enter tractor beam country.
I too first thought in situ weathering but, but the grus/ real fine grained grus is enclosed within pedogenic carbonate coatings. so perhaps suggesting weathering before entering the chalklands.
It is a great puzzle,
Rob Ixer
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