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Postimpact earliest Paleogene warming shown by fish debris oxygen isotopes (El Kef, Tunisia)

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Science  29 Jun 2018:
Vol. 360, Issue 6396, pp. 1467-1469
DOI: 10.1126/science.aap8525
  • Fig. 1 K/Pg paleogeography.

    K/Pg paleogeography (21) showing El Kef and Chicxulub.

  • Fig. 2 Age-depth model of El Kef foraminiferal events.

    Age-depth model of El Kef foraminiferal events (22) dated relative to a K/Pg boundary (23, 24) using a boundary age of 66.043 million years (Ma) (25). LO, lowest occurrence; HO, highest occurrence.

  • Fig. 3 El Kef fish debris δ18O values plotted against depth.

    Samples are grouped into three stratigraphic bins divided at the K/Pg boundary and 3 m above the boundary. Averages ± 1 SD for each bin are shown to the right with P values of t tests comparing means (supplementary materials). The difference in means between the earliest Paleogene (orange) and both the underlying Cretaceous (blue) and overlying Paleogene (green) is significant at the 5σ and 4σ level, respectively. The difference in means between the blue and green bins is not significant. Ages in thousand years (Kyr) are based on Fig. 2 age model; temperature calculated using (26), assuming seawater δ18O = –1‰VSMOW; error bar ± 0.3‰ (supplementary materials).

Supplementary Materials

  • Postimpact earliest Paleogene warming shown by fish debris oxygen isotopes (El Kef, Tunisia)

    K. G. MacLeod, P. C. Quinton, J. Sepúlveda, M. H. Negra

    Materials/Methods, Supplementary Text, Tables, Figures, and/or References

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    • Materials and Methods
    • Supplementary Text
    • Figure S1
    • Tables S1 and S2
    • References

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