Pierre Shale

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Isotope sclerochronology of ammonites (Baculites Compressus) from methane seep and non-seep sites in the Late Cretaceous Western Interior Seaway, USA: Implications for ammonite habitat and mode of life
Neil H. Landman, J. Kirk Cochran, Mariah Slovacek, Neal L. Larson, Matthew P. Garb, Jamie Brezina and James D. Witts

American Journal of Science June 2018, 318 (6) 603-639; DOI: https://doi.org/10.2475/06.2018.01
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Some suggestions upon the methods of grouping the formations of the middle Cretaceous and the employment of an additional term in its nomenclature
George Homans Eldridge

American Journal of Science October 1889, s3-38 (226) 313-321; DOI: https://doi.org/10.2475/ajs.s3-38.226.313

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