Sometimes, when finding fossils in Flaggy limestones, the bedding is subject to different forms of mineralization. This pterosaur fossil in the Natural History Museum, London, has a formation of black manganese dioxide (dendritic pyrolucite) forming crystal structures around the fossil bones. This is quite common in these Bavarian specimens, though they are not very frequiently seen beyond the storage rooms of museums.
Just an oddity to share at the end of 2008.
Happy New Year