ScienceDaily (Jun. 8, 2008) — For the first time paleontologists have found fossilized burrows of tetrapods -- any land vertebrates with four legs or leglike appendages -- in Antarctica dating from the Early Triassic epoch, about 245 million years ago.The fossils were created when fine sand from an overflowing river poured into the animals' burrows and hardened into casts of the open spaces. The largest preserved piece is about 14 inches long, 6 inches wide and 3 inches deep. No animal remains were found inside the burrow casts, but the hardened sediment in each burrow preserved a track made as the animals entered and exited.
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