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belemnite    
n. 箭石

箭石

belemnite
n 1: a conical calcareous fossil tapering to a point at one end
and with a conical cavity at the other end containing (when
unbroken) a small chambered phragmocone from the shell of
any of numerous extinct cephalopods of the family
Belemnitidae


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  • Belemnitida - Wikipedia
    Belemnitida (or belemnites) is an extinct order of squid -like cephalopods that existed from the Late Triassic to Late Cretaceous (and possibly the Eocene [3][4]) Unlike squid, belemnites had an internal skeleton that made up the cone
  • Belemnites - British Geological Survey
    These are the Belemnite Marls, of Pliensbachian age, which can be seen in the cliffs near Charmouth Belemnites are the best preserved fossils in this interval, and include the genera Angeloteuthis, Bairstowius, Hastites, Passaloteuthis and Pseudohastites
  • An Introduction to Belemnites - UK Fossil Collecting
    This part of the belemnite is less commonly found as fossils than the guard, due to its more fragile nature However, when found, it may be preserved in a variety of different rock or mineral types, such as mudstone, pyrite or calcite, and may be inflated as in life or crushed flat
  • What is a Belemnite Fossil? - History Hit
    Belemnites were squid-like animals belonging to the cephalopod class of the mollusc phylum This means they are related to ancient ammonites as well as modern squids, octopuses, cuttlefish and nautiluses They lived during the Jurassic period (started c 201 million years ago) and Cretaceous period (ended c 66 million years ago)
  • Introduction to belemnites - Deposits
    Belemnites are an extinct group of cephalopods that first appeared during the Triassic and became extinct at the end of the Cretaceous period Their closest living relatives are squid and cuttlefish
  • Belemnites | The Conchological Society of Great Britain and Ireland
    Belemnites are common fossils, and most collectors will have a few of these distinctive bullet-shaped fossils in their collections In fact belemnites have been recognised as something other than mere stones for thousands of years
  • Belemnites Facts - information about the extinct, prehistoric animal . . .
    Belemnites are believed have been similar to modern squid, and were related to cuttlefish They had ten arms of approximately equal length, which were apparently equipped with hooks for grabbing prey, and also an ink sac They also had an internal chambered shell (known as the "guard" or "rostrum") which was enclosed by muscular tissue
  • BELEMNITE Definition Meaning - Merriam-Webster
    The meaning of BELEMNITE is any of various extinct cephalopods (order Belemnoidea) especially abundant in the Mesozoic era that had internal shells and that superficially resembled and are regarded as ancestors of the squids
  • Belemnite · Type Fossils · 1A Collections
    Exceptional preservation of belemnites showing soft parts has shown them to be very similar to squid in shape The guard and phragmocone were held inside the soft parts of the animals, acting as a kind of backbone Because the phragmocone is made of aragonite it is often not preserved In contrast the calcitic guard is very often preserved
  • The palaeobiology of belemnites - Wiley Online Library
    Belemnites were a group of coleoid cephalopods whose fossil remains are common in Jurassic and Cretaceous marine sediments They originated during the Late Triassic and went extinct at the Cretaceous Palaeogene boundary (Iba et al , 2011, 2012)





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