22227 - Great Collection of 2 Perisphinctes virguloides Late Jurassic Ammonite - Madagascar Olcostephanus Impressive natural association with one

Impressive natural association with one specimen of the genus Acanthopyge and other specimen of the genus Phacops

Congosaurus

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Superb huge and nicely preserved specimen

Al)(SiO4)(Si2O7)O(OH)

22227 - Great Collection of 2 Perisphinctes virguloides Late Jurassic Ammonite - Madagascar Olcostephanus Impressive natural association with oneGreat Collection of 2 Perisphinctes virguloides Late Jurassic Ammonite Madagascar. Perisphinctes sp, (ammonite) Cephalopoda Ammonoidea Perisphinctidae Perisphinctes is an extinct genus of ammonite cephalopod. They lived during the Middle Late Jurassic Epochs and serve as an biostratigraphic index fossil for that time period. This species of Perisphinctes comes from the classic locality of the Upper Jurassic (Oxfordian stage) of Madagascar.