caption: The image shows a group of four different types of ammonites on a black surface, with two papers with text written on them in the foreground. The papers appear to be from the National Museum of Natural History in Amsterdam, as indicated by the text on the papers. The ammonites are arranged in a neat row, with the largest one in the center and two smaller ones on either side. The colors of the ammonites range from light brown to dark brown, and the papers have a glossy finish.