Diverse New Microvertebrate Assemblage from the Upper Trias

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• journal_title：Journal of Paleontology
• Contributor：Andrew B. Heckert ; Jonathan S. Mitchell ; Vincent P. Schneider ; Paul E. Olsen
• Publisher：Paleontological Society
• Date：2012-
• Format：text/html
• Language：en
• Identifier：10.1666/11-098.1
• journal_abbrev：Journal of Paleontology
• issn：0022-3360
• volume：86
• issue：2
• firstpage：368
• section：ARTICLES

摘要

<p id="p-1">The Moncure microvertebrate locality in the Cumnock Formation, Sanford sub-basin, North Carolina, dramatically increases the known Late Triassic age vertebrate assemblage from the Deep River Basin. The ∼50,000 recovered microvertebrate fossils include osteichthyans, amphibians, and numerous lepidosauromorph, archosauriform, and synapsid amniotes. Actinopterygian fossils consist of thousands of scales, teeth, skull, and lower jaw fragments, principally of redfieldiids and semionotids. Non-tetrapod sarcopterygians include the dipnoan pan class="named-content genus-species" id="named-content-1">Arganoduspan> sp., the first record of lungfish in the Newark Supergroup. Temnospondyls are comparatively rare but the preserved centra, teeth, and skull fragments probably represent small (juvenile) metoposaurids. Two fragmentary teeth are assigned to the unusual reptile pan class="named-content genus-species" id="named-content-2">Colognathus obscuruspan> (Case). Poorly preserved but intriguing records include acrodont and pleurodont jaw fragments tentatively assigned to lepidosaurs. Among the archosauriform teeth is a taxon distinct from pan class="named-content genus-species" id="named-content-3">R. callenderipan> that we assign to pan class="named-content genus-species" id="named-content-4">Revueltosaurus olsenipan> new combination, a morphotype best assigned to cf. pan class="named-content genus-species" id="named-content-5">Galtoniapan>, the first Newark Supergroup record of pan class="named-content genus-species" id="named-content-6">Crosbysauruspan> sp., and several other archosauriform tooth morphotypes, as well as grooved teeth assigned to the recently named species pan class="named-content genus-species" id="named-content-7">Uatchitodon schneideripan>. Synapsids represented by molariform teeth include both “traversodontids” assigned to aff. pan class="named-content genus-species" id="named-content-8">Boreogomphodonpan> and the “dromatheriid” pan class="named-content genus-species" id="named-content-9">Microconodonpan>. These records are biogeographically important, with many new records for the Cumnock Formation and/or the Newark Supergroup. In particular, pan class="named-content genus-species" id="named-content-10">Colognathuspan>, pan class="named-content genus-species" id="named-content-11">Crosbysauruspan>, and pan class="named-content genus-species" id="named-content-12">Uatchitodonpan> are known from basins of Adamanian age in the southwestern U.S.A. These new records include microvertebrate taxa more typical of non-Newark basins (abundant archosauriforms, temnospondyls, lungfish) as well as more typical Newark osteichthyans and synapsid-rich faunal elements. p>