It looks fantastic Dennis.
How thick did you make the stone. And what sort of density/weight is it?
I'm heading out to York today, for our summer Christmas dinner. We do it every year since our family is spread all over now and meeting in December means we never all get to the same spot at the same time.
The location we will meet will be Malton. There is some interesting Geology in the area, And some Ancient British history. Namely there are some chariot burials in Wetwang from the pre-roman celts.
I'm going to have a wander down the river Derwent if I get chance. And see if I can spot anything of interest. I thick my target should be the Scalby formation.
http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=SCY