You know that rocks out of mines have been cracked open and live toads have come out of them. There was also an incident of a taradactle-like creature one time.. they need to x-ray it.
The pterodacrtyl story took place in France in railway tunnel, I couldn't find much on-line about it but I don't think there is much more to it than a story.
The original story was in 'The Illustrated London News', Feb 9th 1856 on page 166. Good luck finding a copy...