It appears I wrongly attributed this to a Diplodocus when I first modelled it, I was wrong, it appears it is to be the huge footprint from a Brachiosaurus. A single Dinosaur footprint measuring 0.9 metres across near Purbeck, Dorset. A series of small impressions c.10cm across running around the edge have been interpreted as the footprints of an infant dinosaur.
This model was created to secure a detailed an precise 3D record of the footprints which could be shared around the world. To read more about the footprints follow this link http://www.landscaperesearchcentre.org/wp/?p=113