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Basilosaurs are a family of extinct, primitive whales of the early to middle eocene. As whales early ancestors left the land in favor of the sea, it is likely that these were the first fully aquatic whale.

In 1986 the Alaska state legislature officially designated the Woolly Mammoth (Mammuthus primigenius) as the Alaska state fossil.

In 1988 the Arizona state legislature designated the petrified wood of Araucarioxylon arizonicum, a prehistoric conifer as the Arizona state fossil.

Kambaba jasper is a greenish stone full of black orbs that superficially resembles fossil stromatolites. But, is it one?

In 2013 the North Carolina state legislature officially designated the fossil teeth of the prehistoric Megalodon shark as the North Carolina state fossil.

Celestite is a strontium based mineral that frequently has a deep, sky-blue coloration. It tends to form attractive, well-shaped crystals often found inside of geodes.

In 1976 the Louisiana state legislature officially designated petrified palm wood of the genus Palmoxylon as the Louisiana state fossil.

Texas is one of the few states that have multiple state fossils by way of having a state stone which is also a fossil as well as a state dinosaur.

Who would win in a hypothetical battle to the death between two of the top marine predators of all time. The Megalodon and the Mosasaurus.

Meet the 11 most terrifying creatures to ever exist—giant ocean jaws, armored nightmares, and river-stalking horrors. Not for the faint of heart.