A cone-shaped, fossilized inner layer of any of an extinct genus of cephalopods related to the cuttlefish.
An extinct band of Mesozoic marine cephalopod, virtually identical in several ways toward modern squid and closely associated with the current cuttlefish.
A conical calcareous fossil, tapering to a point within lower extremity, with a conical hole on other end, where it really is ordinarily damaged; however when perfect it includes a little chambered cone, labeled as the phragmocone, prolonged, on a single side, into a delicate concave knife; the thunderstone. It is the interior layer of a cephalopod about the sepia, and belonging to an extinct family members. The belemnites are found in stones for the Jurassic and Cretaceous centuries.
A straight, solid, tapering, dart-shaped fossil, the internal bone or layer of a molluscous pet of this extinct family Belemnitidæ, typical into the Chalk and Jurassic limestone.
your pet to which these types of a bone belonged.
also referred to as ceraunite.
a conical calcareous fossil tapering to a place at one end in accordance with a conical hole at other end containing (whenever unbroken) a small chambered phragmocone from layer of every of numerous extinct cephalopods associated with the household Belemnitidae