In message , Andrew Mawson
writes

Tim, if you search for bore hole data near you, you will get a full
written description of the sections of the ground through which they
have bored:

http://www.bgs.ac.uk/data/boreholescans/home.html

Interesting. Thanks. The local water co. bored a large well on our land
in 2005.

The detailed register shows no information although I can tell the world
it was sandy chalk down as far as they went. I hope the residents of
Welwyn/Hatfield are suitably grateful:-)

--
Tim Lamb