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  • Sphenodiscus lenticularis

    Images:

    Sinopaleus

    By Sinopaleus

    Taxonomy

    Ammonite

    Kingdom: Animalia
    Phylum: Mollusca
    Class: Cephalopoda
    Order: Ammonitida
    Family: Sphenodiscidae
    Genus: Sphenodiscus
    Species: Sphenodiscus lenticularis

    Geological Time Scale

    Eon: Phanerozoic
    Era: Mesozoic
    Period: Cretaceous
    Sub Period: None
    Epoch: Late

    Stratigraphy

    Fox Hills Formation

    Provenance

    Acquired by: Purchase/Trade

    Location

    South Dakota
    United States

    Comments

    Sphenodiscus lenticularis

    Late Cretaceous (Maastrichian)

    Fox Hills Formation, South Dakota, U.S.A

    Go to fossils Ammonoids

    User Feedback


    Sinopaleus
    13 hours ago, aplomado said:

    Amazing!

    Thanks :) 

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    The Amateur Paleontologist

    The Amateur Paleontologist

    Posted

    Beautiful ammonite :)

    -Christian

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    Sinopaleus
    3 hours ago, The Amateur Paleontologist said:

    Beautiful ammonite :)

    -Christian

    Thanks Christian ;) 

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    Uncle Siphuncle

    Uncle Siphuncle

    Posted

    Much flashier than the modes of Spheno preservation I've encountered in TX.

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    Lihaaja

    Most beautiful ammonite I've ever seen.. :drool::wub:

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    Sinopaleus
    10 hours ago, Uncle Siphuncle said:

    Much flashier than the modes of Spheno preservation I've encountered in TX.

    Indeed, I was quite shocked at how nicely the shell mineralized, which is also not the most common from Fox Hills (many are just the intricate septal patterns of the internal mold)

     

    4 hours ago, Lihaaja said:

    Most beautiful ammonite I've ever seen.. :drool::wub:

    Thanks :) This is quite a nice example for Fox Hills, but there are also the Canadian ammolite ammonites with even greater radiance, if you're interested in checking those out

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    Uncle Siphuncle

    Uncle Siphuncle

    Posted

    These pics represent some of the best Sphenodiscus preservation I've encountered in Texas, for comparison.  I haven't seen any nacre preservation in the Escondido Formation, where the ammos are most common in limestone.  But it wouldn't surprise me to see nacre in the Kemp Clay farther north along the Balcones Fault.

    Kes Sphenodiscus 1f Site 417 060514.jpg

    Kes Sphenodiscus pleurisepta 3b Site 417 052310.jpg

    Kes Sphenodiscus 11a Site 417 011908.jpg

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    Sinopaleus
    On 6/22/2019 at 10:29 AM, Uncle Siphuncle said:

    These pics represent some of the best Sphenodiscus preservation I've encountered in Texas, for comparison.  I haven't seen any nacre preservation in the Escondido Formation, where the ammos are most common in limestone.  But it wouldn't surprise me to see nacre in the Kemp Clay farther north along the Balcones Fault.

    Kes Sphenodiscus 1f Site 417 060514.jpg  Kes Sphenodiscus pleurisepta 3b Site 417 052310.jpg  Kes Sphenodiscus 11a Site 417 011908.jpg

    I would think nacre would be preserved better in shale than in limestone as well. But those are some really nice septal patterns too ;) 

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