Ammanoids evuation

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Ammanoids what are they

  • Ammanoids have a coiled and chambered shell with a suture line where chambers intersect  with the outside
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EVOLUTION OF THE SUTURE LINE: GONIOTITE

EVOLUTION OF THE SUTURE LINE:

GONIOTITE

  • carboniferous+ permian (oldest ammanoid)
  • rounded saddle
  • pointed lobe
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EVOLUTION OF THE SUTURE LINE:CERATITE

  • triassic
  • rounded saddle
  • fluted lobe
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EVOLUTION OF THE SUTURE LINE:AMMONITE

  • jurassic + cretaceous (youngest ammanoid)
  • fluted saddle
  • fluted lobe
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