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A cosmopolitan late Ediacaran biotic assemblage: new fossils from Nevada and Namibia support a global biostratigraphic link.
Proc Biol Sci. 2017 Jul 12; 284(1858)PB

Abstract

Owing to the lack of temporally well-constrained Ediacaran fossil localities containing overlapping biotic assemblages, it has remained uncertain if the latest Ediacaran (ca 550-541 Ma) assemblages reflect systematic biological turnover or environmental, taphonomic or biogeographic biases. Here, we report new latest Ediacaran fossil discoveries from the lower member of the Wood Canyon Formation in Nye County, Nevada, including the first figured reports of erniettomorphs, Gaojiashania, Conotubus and other problematic fossils. The fossils are spectacularly preserved in three taphonomic windows and occur in greater than 11 stratigraphic horizons, all of which are below the first appearance of Treptichnus pedum and the nadir of a large negative δ13C excursion that is a chemostratigraphic marker of the Ediacaran-Cambrian boundary. The co-occurrence of morphologically diverse tubular fossils and erniettomorphs in Nevada provides a biostratigraphic link among latest Ediacaran fossil localities globally. Integrated with a new report of Gaojiashania from Namibia, previous fossil reports and existing age constraints, these finds demonstrate a distinctive late Ediacaran fossil assemblage comprising at least two groups of macroscopic organisms with dissimilar body plans that ecologically and temporally overlapped for at least 6 Myr at the close of the Ediacaran Period. This cosmopolitan biotic assemblage disappeared from the fossil record at the end of the Ediacaran Period, prior to the Cambrian radiation.

Authors+Show Affiliations

Smithsonian Institution, PO Box 37012, MRC 121, Washington, DC 20013-7012, USA esmit163@jhu.edu. Department of Earth and Planetary Sciences, Johns Hopkins University, 3400 N. Charles Street, Olin Hall, Baltimore, MD 21218, USA.Department of Earth and Planetary Sciences, Johns Hopkins University, 3400 N. Charles Street, Olin Hall, Baltimore, MD 21218, USA. Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, USA.Smithsonian Institution, PO Box 37012, MRC 121, Washington, DC 20013-7012, USA. The Department of Geology and Geophysics, Yale University, 210 Whitney Ave, New Haven, CT 06511-8902, USA.Smithsonian Institution, PO Box 37012, MRC 121, Washington, DC 20013-7012, USA. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, No. 39 East Beijing Road, Nanjing 210008, People's Republic of China.US Geological Survey, Geosciences and Environmental Change Science Center, Southwest Region PO Box 25046, MS 980, Denver, CO 80225-0046, USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28701565

Citation

Smith, E F., et al. "A Cosmopolitan Late Ediacaran Biotic Assemblage: New Fossils From Nevada and Namibia Support a Global Biostratigraphic Link." Proceedings. Biological Sciences, vol. 284, no. 1858, 2017.
Smith EF, Nelson LL, Tweedt SM, et al. A cosmopolitan late Ediacaran biotic assemblage: new fossils from Nevada and Namibia support a global biostratigraphic link. Proc Biol Sci. 2017;284(1858).
Smith, E. F., Nelson, L. L., Tweedt, S. M., Zeng, H., & Workman, J. B. (2017). A cosmopolitan late Ediacaran biotic assemblage: new fossils from Nevada and Namibia support a global biostratigraphic link. Proceedings. Biological Sciences, 284(1858). https://doi.org/10.1098/rspb.2017.0934
Smith EF, et al. A Cosmopolitan Late Ediacaran Biotic Assemblage: New Fossils From Nevada and Namibia Support a Global Biostratigraphic Link. Proc Biol Sci. 2017 Jul 12;284(1858) PubMed PMID: 28701565.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A cosmopolitan late Ediacaran biotic assemblage: new fossils from Nevada and Namibia support a global biostratigraphic link. AU - Smith,E F, AU - Nelson,L L, AU - Tweedt,S M, AU - Zeng,H, AU - Workman,J B, PY - 2017/05/06/received PY - 2017/06/07/accepted PY - 2017/7/14/entrez PY - 2017/7/14/pubmed PY - 2018/2/2/medline KW - Ediacara biota KW - Ernietta KW - Gaojiashania, Ediacaran–Cambrian boundary KW - Wood Canyon Formation KW - extinction JF - Proceedings. Biological sciences JO - Proc Biol Sci VL - 284 IS - 1858 N2 - Owing to the lack of temporally well-constrained Ediacaran fossil localities containing overlapping biotic assemblages, it has remained uncertain if the latest Ediacaran (ca 550-541 Ma) assemblages reflect systematic biological turnover or environmental, taphonomic or biogeographic biases. Here, we report new latest Ediacaran fossil discoveries from the lower member of the Wood Canyon Formation in Nye County, Nevada, including the first figured reports of erniettomorphs, Gaojiashania, Conotubus and other problematic fossils. The fossils are spectacularly preserved in three taphonomic windows and occur in greater than 11 stratigraphic horizons, all of which are below the first appearance of Treptichnus pedum and the nadir of a large negative δ13C excursion that is a chemostratigraphic marker of the Ediacaran-Cambrian boundary. The co-occurrence of morphologically diverse tubular fossils and erniettomorphs in Nevada provides a biostratigraphic link among latest Ediacaran fossil localities globally. Integrated with a new report of Gaojiashania from Namibia, previous fossil reports and existing age constraints, these finds demonstrate a distinctive late Ediacaran fossil assemblage comprising at least two groups of macroscopic organisms with dissimilar body plans that ecologically and temporally overlapped for at least 6 Myr at the close of the Ediacaran Period. This cosmopolitan biotic assemblage disappeared from the fossil record at the end of the Ediacaran Period, prior to the Cambrian radiation. SN - 1471-2954 UR - https://www.unboundmedicine.com/medline/citation/28701565/A_cosmopolitan_late_Ediacaran_biotic_assemblage:_new_fossils_from_Nevada_and_Namibia_support_a_global_biostratigraphic_link_ L2 - https://royalsocietypublishing.org/doi/10.1098/rspb.2017.0934?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -