010034 - Nicely Preserved Knightia Fossil Fish Eocene Green River Fm, Wyoming (USA) Onchopristis Bones This factor makes this tooth

This factor makes this tooth much more valuable for collectors

From these we cannot deduct the species because they are almost completely buried in the rock

the biggest shark that has ever existed

which has as a result that some small pieces are lost forever

1371/journal

010034 - Nicely Preserved Knightia Fossil Fish Eocene Green River Fm, Wyoming (USA) Onchopristis Bones This factor makes this toothMagnificent specimen with detailed preservation. You can see the whole bone structure as well as details of the jaw and its small teeth. From this type of fossilization, through taphonomy, many aspects of the original paleoenvironment can be learned. This type of preservation only occurs under certain very special circumstances, in the bottoms of lakes, with anoxic conditions, for example.