[dinosaur] Sauropod Dinosaurs from the Northern Morrison Formation of Wyoming (free pdf)

Ben Creisler
[email protected]

A new publication in open access at link:

Emanuel Tschopp, Susannah C.R. Maidment, Matthew C. Lamanna & Mark A.
Norell (2019)
Reassessment of a Historical Collection of Sauropod Dinosaurs from the
Northern Morrison Formation of Wyoming, with Implications for Sauropod
Biogeography.
Bulletin of the American Museum of Natural History No. 437: 1-79
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1206_0003-2D0090.437.1.1&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=a2gvvLS5tZJSGCwt4JGjcqditc8QOZpY8MbkfL3a9gY&s=IXPP43egIFjSH4m8ItkxZzEzc_bdL--_49-69Vg_Flg&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__bioone.org_journals_bulletin-2Dof-2Dthe-2Damerican-2Dmuseum-2Dof-2Dnatural-2Dhistory_volume-2D2019_issue-2D437&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=a2gvvLS5tZJSGCwt4JGjcqditc8QOZpY8MbkfL3a9gY&s=eoddJU4pd8-zoUWrxcEpoPsL1jzxsXpgpYwlsIVD24U&e= 

Free pdf link:

https://urldefense.proofpoint.com/v2/url?u=http-3A__digitallibrary.amnh.org_handle_2246_6968&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=a2gvvLS5tZJSGCwt4JGjcqditc8QOZpY8MbkfL3a9gY&s=K4VDjbg7r7Due5I7ItiUKAJiPVLEGgBR6gzuXDcfaXA&e= 

Free Supplemental Materials:

Emanuel Tschopp, Susannah C.R. Maidment, Matthew C. Lamanna & Mark A.
Norell (2019)
Supplemental Material for 'Reassessment of a historical collection of
sauropod dinosaurs from the northern Morrison Formation of Wyoming, with
implications for sauropod biogeography. (Bulletin of the American Museum of
Natural History, no. 437)'
URI: https://urldefense.proofpoint.com/v2/url?u=http-3A__digitallibrary.amnh.org_handle_2246_6969&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=a2gvvLS5tZJSGCwt4JGjcqditc8QOZpY8MbkfL3a9gY&s=XwE2Yxs4uTRJpQBg0yD5a1nJQdyzmAO4W6dpOaLzoCM&e= 
DOI: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.5531_sd.sp.36&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=a2gvvLS5tZJSGCwt4JGjcqditc8QOZpY8MbkfL3a9gY&s=yjRcWcOLgU8DxZS0Y0F-YHgJdAeXXyZuaRUyaVeiWdw&e= 
https://urldefense.proofpoint.com/v2/url?u=http-3A__digitallibrary.amnh.org_handle_2246_6969&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=a2gvvLS5tZJSGCwt4JGjcqditc8QOZpY8MbkfL3a9gY&s=XwE2Yxs4uTRJpQBg0yD5a1nJQdyzmAO4W6dpOaLzoCM&e= 




The Upper Jurassic Morrison Formation of the western United States
preserves one of the best-known Mesozoic paleoecosystems worldwide. The
formation crops out over an area from New Mexico and Oklahoma to Montana
and Utah and encompasses a time span of approximately eight million years.
Recent studies indicate a high diversity of gigantic, herbivorous sauropod
dinosaurs, but the geographic and temporal distributions of species or even
genera of these animals remain poorly understood. In particular, sauropod
specimens from northern outcrops of the formation have rarely been studied
in detail, and temporal relationships among sites are imprecise. Here, we
reassess the taxonomic diversity of the sauropods from a historic Carnegie
Museum locality in northern Wyoming. Previous referrals of material to the
well-known diplodocid genera Apatosaurus and Diplodocus cannot be
confidently confirmed; instead, all these specimens more likely represent
elements from the recently recognized Galeamopus. Specimens previously
assigned to Camarasaurus and Haplocanthosaurus could not be referred to
these genera based on apomorphies, due to a lack of detailed knowledge
concerning the genus- and species-level taxonomy of these sauropods. Our
findings imply that many referrals of incomplete diplodocid skeletons to
Apatosaurus and Diplodocus must be reassessed. These reassessments are
particularly important with regard to specimens from northern localities of
the Morrison Formation, as it is becoming increasingly evident that
diplodocids from this area were distinct from better-known, more southerly
taxa. This geographic segregation does not seem to apply to nondiplodocid
sauropods; however, these taxa are also in need of systematic revision,
which may reveal species-level patterns similar to those observed in
Diplodocidae.

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