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Ed Leith
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Cretaceous
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Rocks
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Fossils
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Gorgosaurus
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Archelon
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Xiphactinus
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Platecarpus
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Archelon
AR-ke-LON, “ruling turtle”

Archelon was the biggest sea-turtle of all time, probably weighing over 2 tonnes when alive. Its large front limbs served as wings for underwater flight. The hooked beak was well suited for catching squid-like animals. Turtles are one of the few groups of reptiles that survived the end-Cretaceous mass extinction.

Skeletal replica:
Who Archelon ischyros
When 75 million years ago
Where southwestern South Dakota

Protostega (pro-TOS-te-ga, “first roof”), a smaller relative of Archelon, is found in southwestern Manitoba.

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