A conical calcareous fossil tapering to a place within lower extremity with a conical cavity at the other end where it is normally damaged but when perfect it includes a little chambered cone called the phragmocone extended using one side into a delicate concave knife the thunderstone it will be the interior layer of a cephalopod linked to the sepia and belonging to an extinct household The belemnites are observed in stones of Jurassic and Cretaceous many years
- a conical calcareous fossil tapering to a spot at one end with a conical cavity on other end containing (whenever unbroken) a tiny chambered phragmocone from the shell of any of various extinct cephalopods regarding the household Belemnitidae
- A conical calcareous fossil, tapering to a point during the lower extremity, with a conical hole at the other end, where it really is ordinarily broken; however when perfect it has a tiny chambered cone, known as the phragmocone, prolonged, using one side, into a fragile concave knife; the thunderstone. It will be the inner layer of a cephalopod pertaining to the sepia, and belonging to an extinct family. The belemnites are located in stones regarding the Jurassic and Cretaceous centuries.
(letter.) A conical calcareous fossil, tapering to a spot at lower extremity, with a conical hole during the other end, in which it really is ordinarily damaged; but once perfect it has a small chambered cone, labeled as the phragmocone, extended, using one side, into a delicate concave blade; the thunderstone. It will be the internal shell of a cephalopod associated with the sepia, and belonging to an extinct household. The belemnites are observed in stones associated with the Jurassic and Cretaceous centuries.