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Fossilized Pliosaur Humerus Bone with Pyrite Displacement

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Midnight1208's loves101 of 1029Red/Orange Art Glass Bowl ------ Wakey, WakeyUnsigned Napier Or A Knock-Off? Flea Market Find $1.00
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    Posted 5 years ago

    rniederman
    (321 items)

    In addition to early wood and brass photographic apparatus, did I also mention a fascination with fossils? Shown here is a large, cut and polished section of a pliosaur humerus. Fossilized dinosaur bones are not overly rare but, as with anything, really great gem grade material (i.e. agatized specimens) is difficult to find. At the rare end of the spectrum is bone fossilized with pyrite. While pyritized fossils such as ammonites are commonly found, dino bones are the exception.

    This nearly five inch pliosaur bone fragment is special because portions of it were pyritized over the course of millions of years of fossilization. Careful cutting and polishing brought out incredible detail from what would otherwise look like a plain rock.

    Although about 150 million years old (probably late Jurassic), it has beautifully preserved cells (the irregular shapes). Most of the fossilized tissue is calcite while others are pyrite. The marrow (oval formation shown at the right) was completely displaced with pyrite. The second image is a close up of the cells showing the incredible detail of pyrite and calcite in the fossilized tissue matrix.

    This example was found many years ago in the Ulyanovsk Volga region of Russia. A small cache of good quality pyritized bones were discovered in a few rock layers while some, like this specimen, were loose along the river.

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    Comments

    1. blunderbuss2 blunderbuss2, 5 years ago
      Man of many facets !
    2. valentino97 valentino97, 5 years ago
      Love it!
    3. fortapache fortapache, 5 years ago
      Very cool. I am a dinosaur (and other prehistoric reptiles) fan myself.
    4. rniederman rniederman, 5 years ago
      Thanks, Thomas!
    5. kyratango kyratango, 5 years ago
      Absolutely stunning!
    6. Rick55 Rick55, 5 years ago
      Amazing!!
    7. rniederman rniederman, 5 years ago
      Thanks, BB2!
    8. rniederman rniederman, 5 years ago
      Thanks, valentino97!
    9. rniederman rniederman, 5 years ago
      Thanks!
      racer4four
      fortapache
      TassieDevil
    10. rniederman rniederman, 5 years ago
      Thanks!
      iggy
      Caperkid
    11. rniederman rniederman, 5 years ago
      Thanks!
      Sean
      David
    12. rniederman rniederman, 5 years ago
      Thanks!
      Gillian
      ho2cultcha
    13. rniederman rniederman, 5 years ago
      Thanks!
      aura
      Rick55
      kyratango
    14. rniederman rniederman, 5 years ago
      Thanks!
      OneGoodFind
      martika
      NevadaBlades
    15. rniederman rniederman, 5 years ago
      Thanks!
      Efesgirl
      Midnight1208
      pops52
    16. rniederman rniederman, 5 years ago
      Thanks!
      Bensallright
      vetraio50
    17. rniederman rniederman, 5 years ago
      Thanks, packrat-place!
    18. rniederman rniederman, 5 years ago
      Thanks, Poire!
    19. rniederman rniederman, 4 years ago
      Thanks, JImam!
    20. rniederman rniederman, 3 years ago
      Thanks, Anik!
    21. ho2cultcha ho2cultcha, 3 years ago
      What a great post! When i was a kid, some pyritized brachiopods were found in some metamorphic schist near our home along the Connecticut River. A friend of my dad's brought some to show us and they were really cool - but also very distorted due to the metamorphic processes. Those were much older and so pyritized over many hundreds of millions of years.
    22. rniederman rniederman, 3 years ago
      Thanks, ho2cultcha! Any pyritized fossil is great. FWIW, earlier this year I picked up another pyritized ichthyosaurus vertebra fossil. It is one of the largest at roughly 5" in diameter … with vascular markings radiating out from the center like a star sapphire.
    23. rniederman rniederman, 1 year ago
      Thanks, Watchsearcher!

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