Research ArticlePALEONTOLOGY

Decoupling biogeochemical records, extinction, and environmental change during the Cambrian SPICE event

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Science Advances  03 Mar 2017:
Vol. 3, no. 3, e1602158
DOI: 10.1126/sciadv.1602158
  • Fig. 1 Drill core locality map (13, 24, 40, 41) with generalized Late Cambrian international and Laurentian chronostratigraphy, and trilobite and conodont biozonation (14, 18, 23, 4346).
  • Fig. 2 Litho-, chemo-, and biostratigraphy of Upper Cambrian cores across the central Missouri intrashelf basin.

    The core data are plotted, from left to right, across a west-to-east trending transect, which represents a paleodepth gradient from the shallow basin margin along the Lebanon Arch (TE-1), to deep intrashelf basin (LS-1 and HM-1), to shallow platform edge (1EE) and back-reef lagoon (12EE) paleoenvironments. Gill et al. (3) values for TE-1 (light blue, δ18Ocarb; gray, δ13Ccarb) shown with corrected biostratigraphic placement (see also fig. S6). Blue circles, δ18Ocarb (‰ V-PDB) values; black circles, δ13Ccarb (‰ V-PDB) values. BT-D, Bonneterre-Davis transition zone.

  • Fig. 3 Ranges of δ13Ccarb values from SPICE onset to maximum (SPICE rising limb; left y axis) and the corresponding stratigraphic thickness over which the rising limb of the SPICE is expressed (right y axis).
  • Fig. 4 Eustato-facies model illustrating the role of transgression and the impingement of 13C-enriched water mass in recording the SPICE in the Upper Cambrian central Missouri intrashelf basin.

    Generalized core locations are shown in the upper panel, with the evolution of hypothetical δ13Ccarb curves shown corresponding to paleoenvironment and lithological changes.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/3/3/e1602158/DC1

    fig. S1. Litho-, chemo-, and biostratigraphy of the TE-1 core in Texas County, Missouri.

    fig. S2. Litho-, chemo-, and biostratigraphy of the LS-1 core in Phelps County, Missouri.

    fig. S3. Litho-, chemo-, and biostratigraphy of the HM-1 core in Dent County, Missouri.

    fig. S4. Litho- and chemostratigraphy of the 1EE core in Iron County, Missouri.

    fig. S5. Litho- and chemostratigraphy of the 12EE core in Iron County, Missouri.

    fig. S6. Discrepancies in chemo- and biostratigraphy of the TE-1 core in Texas County, Missouri, as reported by Gill et al. (3).

    fig. S7. Chemostratigraphy of Upper Cambrian marine strata across the Marjumiid-Pterocephaliid biomere boundary from the Deadwood Formation, Black Hills, South Dakota (33).

    table S1. Depth, stable isotope values (‰ V-PDB), and sample description of our newly reported data from the TE-1 core in Texas County, Missouri.

    table S2. Depth and stable isotope values (‰ V-PDB) of samples from the LS-1 core in Phelps County, Missouri.

    table S3. Depth and stable isotope values (‰ V-PDB) of samples from the HM-1 core in Dent County, Missouri.

    table S4. Depth and stable isotope values (‰ V-PDB) of samples from the 1EE core in Iron County, Missouri.

    table S5. Depth and stable isotope values (‰ V-PDB) of samples from the 12EE core in Iron County, Missouri.

  • Supplementary Materials

    This PDF file includes:

    • fig. S1. Litho-, chemo-, and biostratigraphy of the TE-1 core in Texas County, Missouri.
    • fig. S2. Litho-, chemo-, and biostratigraphy of the LS-1 core in Phelps County, Missouri.
    • fig. S3. Litho-, chemo-, and biostratigraphy of the HM-1 core in Dent County, Missouri.
    • fig. S4. Litho- and chemostratigraphy of the 1EE core in Iron County, Missouri.
    • fig. S5. Litho- and chemostratigraphy of the 12EE core in Iron County, Missouri.
    • fig. S6. Discrepancies in chemo- and biostratigraphy of the TE-1 core in Texas County, Missouri, as reported by Gill et al. (3).
    • fig. S7. Chemostratigraphy of Upper Cambrian marine strata across the Marjumiid-Pterocephaliid biomere boundary from the Deadwood Formation, Black Hills, South Dakota (33).
    • table S1. Depth, stable isotope values (‰ V-PDB), and sample description of our newly reported data from the TE-1 core in Texas County, Missouri.
    • table S2. Depth and stable isotope values (‰ V-PDB) of samples from the LS-1 core in Phelps County, Missouri.
    • table S3. Depth and stable isotope values (‰ V-PDB) of samples from the HM-1 core in Dent County, Missouri.
    • table S4. Depth and stable isotope values (‰ V-PDB) of samples from the 1EE core in Iron County, Missouri.
    • table S5. Depth and stable isotope values (‰ V-PDB) of samples from the 12EE core in Iron County, Missouri.

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