Publications
Kirsty E. H. Penkman, Nigel Thew, Sam Presslee, Sheila Taylor, Ellie Nelson, Daniel Kälin, Marcus Büchi, and Gaudenz Deplazes
February 2024 (preprint)
An aminostratigraphy has been developed for the Early Pleistocene Höhere and Tiefere Deckschotter, and other Quaternary deposits in the Swiss Plateau. Six different biominerals: Bithynia opercula, shell fragments from Fruticola, Arianta and Cepaea, slug plates and worm gannules were used to provide a relative chronology for these deposits. The chronology was validated by existing chronostratigraphic data from the Swiss Plateau, and has provided new insights into a few of the sites.
Emily Millman, Lucy Wheeler, Katharina Billups, Darrell Kaufman, and Kirsty E. H. Penkman
November 2022
This study compares the effects of oxidative pre-treatments on different foraminifera species and evaluates the best approach to improve the reliability of amino acid geochronologies generated from this substrate.
Kirsty E. H. Penkman, Geoff A. T. Duller, Helen M. Roberts, Debra Colarossi, Marc R. Dickinson and Dustin White
October 2022
This is a review of the two different dating approaches used by the EQuaTe project. The variety of materials that can be used, time ranges covered and signals which can be analysed are discussed, alongside examples of archaeological applications and their future potential.
Lucy Wheeler, Kirsty E. H. Penkman and Hans Petter Sejrup
February 2021
This work provides a method for the isolation of the intra-crystalline proteins within the foraminifera species Neogloboquadrina pachyderm (sinistral). Oxidation of inter-crystalline protein reduced variability of D/L values for younger material. This study also provides material-specific regression equations to successfully convert A/I values from ion exchange chromatography analysis to D/L values for aspartic acid, glutamic acid, and alanine from reverse-phase high-performance liquid chromatography analysis.