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MADAGASCAR
细节
A SPLIT AMMONITE
MADAGASCAR
A Perisphinctes sp. from the Jurassic (200-145 Mya), split and polished to reveal inner chambers of brown calcite
10 in. (25.5 cm.) diameter
MADAGASCAR
A Perisphinctes sp. from the Jurassic (200-145 Mya), split and polished to reveal inner chambers of brown calcite
10 in. (25.5 cm.) diameter