What is "ventriculites"

Usage examples of "ventriculites".

Though the limestone formation was, on the evidence of such typical imbedded fossils as ventriculites, positively and unmistakably Comanchian and not a particle earlier, the free fragments in the hollow space included a surprising proportion from organisms hitherto considered as peculiar to far older periods - even rudimentary fishes, mollusks, and corals as remote as the Silunan or Ordovician.