They've bitten off a big chunk -- about 4 billion years from the formation of Earth to the end of the Permian Period (251 mya). Alex and I gave short shrift to the first billion years or so -- drawn into the Cambrian period by giant sea creatures floating above the floor. Excellent reproductions and reconstructions of ancient marine life -- like a huge, armored fish (Dunkleosteous) forever chasing a Cladoselache (an early cartilaginous fish that looks very shark-like) put likely skins on bony fossil remains.
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Across the main hall, in the temporary exhibits gallery, SuperCroc holds sway. Sarcosuchus was probably the largest crocodile to walk the earth. His skull was six feet long, making him about 40 feet in all.
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The Sam Noble has been a winner since it opened -- it's even better now. If you have kids, get them down there before SuperCroc leaves. No kids? Borrow some -- or go by yourself. This is one cool place to spend a hot afternoon.