Permo-Triassic cephalopod hunt

Discussion in 'Cephalopod Fossils' started by Hajar, Dec 27, 2010.

  1. Hajar

    Hajar Haliphron Atlanticus Registered

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    Today's trip didn't actually result in any cephalopods since I ran out of daylight, but there was a beautiful late afternoon light over interesting scenery and I now know how to get to the locations.

    The first photo shows white Permo-Triassic limestones caught up beneath the huge slab of Cretaceous ocean crust that was obducted onto continental crust here during Late Cretaceous time. The darker rocks in the distance are ophiolite (ocean crust). The picture with the palm trees also shows typical ophiolite scenery.

    The red rocks beneath the ancient watchtower are deep-water sediments intensely folded during the emplacement of the ophiolite. The detail of the near-vertical bedded red rocks shows Permian cephalopod limestones. Triassic breccias and platy limestones are a short distance to the right of this view.

    I'll add some cephalopod pictures after the next visit.
     

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  2. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Looking forward to this Hajar!
     
  3. Terri

    Terri Sepia elegans Registered

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    What a beautiful, mysterious place Oman is, I don't know why but "mysterious" always comes to mind when I view the beautiful horizons there. I'm with Kevin, looking forward to this!
     
  4. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    I hope it is NOT up the embankment in that last photo!:shock:
     
  5. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Looks just like Utah except there is no snow... and palm trees... and beaches... Never mind. :hmm:
     
  6. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    hummm, now if I was planning a trip without concern of the cost ... Utah or Oman ... some how the excepts win hands down :wink:
     
  7. Hajar

    Hajar Haliphron Atlanticus Registered

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    It's true, there is a lot to like here.

    So, I went back today (with a couple of accomplices) and yes D, a hike up a mountain was involved. There was some very fossiliferous rock up there and we found several ammonoids together with orthocones, corals, crinoids, bivalves and brachiopods.

    We stopped at Bidbid fort (top photo) on the way, drove through some fine scenery, had lunch on an outcrop of red deep-sea cherts (with the Euphorbia in the foreground), and eventually looked up at that outcrop of limestone, our destination for the day.
     

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  8. Hajar

    Hajar Haliphron Atlanticus Registered

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    Continuing up the hill ...

    There were these interesting plants on the way up. I think they are Physorrhynchus chamaerapistrum, a member of the mustard family.

    As you'd guess, the view from the top was spectacular. After a while we gave our attention to the large blocks of Permian and Triassic limestone in their matrix of Triassic (Lower Dienerian) breccia.
     

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  9. Terri

    Terri Sepia elegans Registered

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    Beyond stunning!
     
  10. Hajar

    Hajar Haliphron Atlanticus Registered

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    This block consists of lowermost Triassic coquina limestones resting on Middle Permian (Wordian) reefal limestones with corals, calcarous sponges and stromatoporoids.

    The coquinas are packed with bivalves (Promyalina, Claraia and Eumorphotis), with an occasional ammonoid or brachiopod (rhynchonellids).

    The ammonoid in the photos looks like a Pseudogyronites to me.
     

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  11. Hajar

    Hajar Haliphron Atlanticus Registered

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    and then it was back down the hill before the sun was gone.
     

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  12. Hajar

    Hajar Haliphron Atlanticus Registered

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    a few more pictures ... and enough for today. I'm tired.
     

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  13. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Beautiful scenery Hajar! Oh how I wish this snow was gone. :sad:
    Like Terri's Ordovician, your Triassic is alot like we have over here. Unfortunately it, like the Ordovician is just a slightly different age, the Ordovician of Tennessee is just younger and the Triassic of Oman is just older. We find Eumorphotis and possibly the last of Claraia, but the ammonoids are quite different.
     
  14. Hajar

    Hajar Haliphron Atlanticus Registered

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    When your snow has gone it will be too hot to go out here.

    Interesting to think that these animals were living shortly after the most severe mass extinction in Earth history.

    Here attached is a photo from last night's starwatch site (what a spectacularly clear night and Jupiter with four moons a fine sight). We camped on Lower Permian rocks, cross-bedded shallow marine with very abundant fossils.
     

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  15. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    :grin: Yes, the question now seems to be how fast did it recover. :sly:

    A nice Permian fauna! Is that an orthocone or a scaphopod in the lower left corner?
     
  16. Hajar

    Hajar Haliphron Atlanticus Registered

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    I read a bit more about that section and found: "evidence of an extraordinarily rapid faunal recovery after the P-Tr crisis" ... "It contains also the most diverse Griesbachian assemblage known to date, which has a community structure not normally recorded in pre-Spathian rocks and which was living under well oxygenated conditions".

    The long thin objects are scaphopods though I picked them up in the hope that they might be orthocones. Bellerophontids were also very common (masquerading as goniatites!).

    Happy New Year to all!
     
  17. Terri

    Terri Sepia elegans Registered

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    Beautifully done Hajar! Thanks for taking us all along, looking forward to seeing more!
     
  18. Hajar

    Hajar Haliphron Atlanticus Registered

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    Thanks Terri. Here are a few more photos to show the mood of the place (an area called Huqf). No climbing involved D!
     

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  19. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    I could probably do that last "hill" but not the one that would require a goat's hooves in your prior photos :wink: Ditto on Terri's, "Thanks" comments.
     
  20. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Looks like a very dark place for stargazing. 8-)

    watch out for Sand Sharks. :sly:
     

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