An unusual naturally black ammonite from Ancash, Peru. It is mounted on a custom wooden base.
Ammonites are extinct relatives of modern day nautiloids and squid. The largest known ammonite in the world would have been 8 1/2 feet (2.59 metres) across if it were complete.
1 inch (2.5 cm) wide, 13/16 inch (2.0 cm) deep and 7/8 inch (2.2 cm) tall.