This shark tooth fossil is from a Squalicorax shark (sometimes simply referred to as Corax). Squalicorax is a genus of extinct lamniform shark known to have lived during the Cretaceous period. These sharks are of medium size, up to 5 meters in length (usually smaller – 2 meters). Their bodies were similar to the modern gray sharks, but the shape of the teeth is strikingly similar to that of a tiger shark. The age of this squalicorax shark tooth fossil is approximately 65 million years old.