Predator fish from Holzmaden (Pachycormus bollensis) fossil. This impressive Pachycormus from the Swabian layer stage country in Esslingen district is approx. 170 million years old. Posterity owes him after Shell Steinmannia (formerly Posidonia) bronni nominated slate, which was created in poorly ventilated water (Gyttja) and the fossilization beneficiary Jura / Lias, approx. 170 million old. Original: Private collection, slate.