“If you thought ammonites were small creatures that would fit into the palm of your hand, have a look at this monster:
This is a specimen of Parapuzosia seppenradensis, which has
a diameter of 8 feet, 6 inches,
weighs 3.5 tonnes
and was found in rocks . . . at Seppenrade near Munster, Germany.
It was discovered in 1895 by Prof Hermann Landois and is currently on display at the Munster Natural History Museum (Westfälischen Landesmuseum für Naturkunde).
A cast is on display at the Museum of Natural History in LA