Late Pennsylvanian seasonality reflected in the 18O and elemental composition of a brachiopod shell

Mii Horng-Sheng Mii, E. L. Grossman

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    51 Citations (Scopus)


    To evaluate the potential for the study of Late Pennsylvanian seasonality, detailed isotopic and elemental analyses were performed on a single specimen of the brachiopod Neospirifer dunbari. Contours of 18O, Mg, Na, and S concentrations parallel growth bands and reveal a record of 1 1/2 to 2 cycles. Mg, S, and Na contents varied inversely with δ18O. This trend is opposite to the expected diagenetic trend and is consistent with the temperature dependences of Mg content and δ18O, thus implying preservation of shell chemistry. The ~1.2‰ range in δ18O values suggests a seasonal temperature variation of 5 to 6°C. This high seasonality for the tropical epicontinental sea of Kansas supports climate-model predictions of enhanced continentality in Pangean climate. -Authors

    Original languageEnglish
    Pages (from-to)661-664
    Number of pages4
    Issue number7
    Publication statusPublished - 1994 Jan 1

    ASJC Scopus subject areas

    • Geology

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