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Snake Stones: Fragment of a Tulear Nautilus


nautilus fragmentA polished fragment of a fossil nautilus, showing the geometric arrangement of its chambers and the tube that connected them all together, known as a siphuncle (Latin sīphunculus, meaning “a little siphon”), seen here as a dot repeated in each section.

This nautilus comes from the Morondava River Basin, near the
town of Sakaraha, in the Atsimo-Andrefana region of southwest
Madagascar (right), in the former province of Tuléar.  It dates from the Late Jurassic period, Oxfordian age (~161 to 156
million years ago).

© 2014, Images and Text, Christopher Lee Matthews

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