04569 - Top Quality 5.32 Inch Hybodus Shark Dorsal Spine KemKem

Beautiful spine corresponding to the dorsal fin of this incredible shark that reigned the seas and the fluvial systems next to the coast during all the Mesozoic Era. It is a species of shark that presented particular features, such as this sharp spine in its flipper. The preservation of this piece is very good, and the strong and well defined longitudinal stretch marks can be observed. Its fossilization color has gorgeous orangish shades. It has some glued or filled fractures.

The lithology of this body of sediment is characterized by the dominance of sandstones (also known as arenites) and fluvial gravel, of siliceous nature. Sometimes large concentrations of iron oxide are present, and then a small sample of that is usually present at the base of the tooth. These mineralizations are responsible for the wide range of beautiful reddish color tones, slowly drawn during millions of years via fossil-diagenetic processes. The complicated sedimentarian architecture of the layers where most large vertebrates are found makes the excavation methodology a real challenge. Sometimes the local miners have to excavate long tunnels that follow the distribution of the fossiliferous layer.