22227 - Great Collection of 2 Perisphinctes virguloides Late Jurassic Ammonite - Madagascar Olcostephanus Congosaurus

Congosaurus

Age range: 318

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

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

22227 - Great Collection of 2 Perisphinctes virguloides Late Jurassic Ammonite - Madagascar Olcostephanus CongosaurusGreat 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.