Koll, DominikLachner, JohannesBeutner, SabrinaFichter, SebastianMerchel, SilkeRugel, GeorgSlavkovská, ZuzanaVivo-Vilches, CarlosWinkler, StellaWallner, Anton2025-05-232025-05-232041-1723PubMed:39929830WOS:001418711200037http://www.scopus.com/inward/record.url?scp=85218186995&partnerID=8YFLogxKhttps://hdl.handle.net/1885/733750856Cosmogenic nuclide dating relies on the constancy of production and incorporation of radionuclides in geological archives. Anomalous deviations from constancy during the Holocene or Pleistocene are frequently used as global benchmarks to harmonize different data sets. A similar dating anchor on the million year timescale was so far not presented. In this work, we report on a prolonged cosmogenic 10Be anomaly during the late Miocene recorded in several Central and Northern Pacific deep-ocean ferromanganese crusts in the time period 9–11.5 Myr ago peaking at 10.1 Myr. Potential origins of this anomaly are discussed in the light of geological, climatic, solar and astrophysical events. This anomaly has the potential to be an independent time marker for marine archives.D.K. was supported by an AINSE Ltd. Postgraduate Research Award (PGRA). This work was supported by the Australian Research Council's Discovery scheme, project numbers DP180100495 and DP180100496 (A.W.) and through RADIATE (824096) from the EU Research and Innovation program HORIZON 2020, project numbers 21002421-ST and 20002142-ST (D.K.). This research was carried out at the Ion Beam Center (IBC) at the Helmholtz-Zentrum Dresden-Rossendorf e.V., a member of the Helmholtz Association, project number 22003072-EF (D.K.). The authors want to thank Gunther Korschinek for generously providing the crust SO142-4DR and his help to organise the large piece of VA13/2-237KD.9en© The Author(s) 2025.Ams-facility dreamsBeryllium isotopesCarbon-dioxideCosmic-raysFerromanganese crustGamma-ray burstGeomagnetic-fieldGrowth-rateIce-age epochsIsotope stratigraphy202510.1038/s41467-024-55662-485218186995