Lower Cretaceous nautilus fossils (Madagascar ammonites)
The Lower Cretaceous is about 0.112 billion to 0.1 billion years old. Nautilus (Ammonite) is a class of paleontology, belonging to a cephalopod. They are a group of extinct marine invertebrates with a spiral shape. This ammonites is in the Mahajanga basin of northwest Madagascar, also known as Madagascar ammonites fossils. The Museum of Natural History in Vienna
