Science blogger Bora at a Blog around the Clock has taken up the cause of the unidentified fossil. Thanks, Bora.
Brian at Laelaps has pitched in, too. I bet Gideon Mantell wished he had this kind of support when he wrongly put Iguanodon's thumb spike on its nose.
Thanks too Neil for your comments. The idea that this might be ediacaran which would cause wigs on the green and a stampede of -ologists, the whole coastline hereabouts being jurassic.
A sedimentary geologist thinks it may be physical process around the belemnite rather than an imprint of preserved soft tissue.