Ammonite Fossils cut and polished (pair)
 
Small -12 grams , approx 2cm
Medium- 28 grams, approx 4cm
Large- 50 grams, approx 6cm
 
Ammonites are perhaps the most widely known fossil, possessing the typically ribbed spiral-form shell as pictured above. These creatures lived in the seas between 240 - 65 million years ago. The name 'ammonite' (usually lower-case) originates from the Greek Ram-horned god called Ammon. Ammonites belong to a group of predators known as cephalopods, which includes their living relatives the octopus, squid, cuttlefish and nautilus