Vahlenkamp Maximilian mvahlenkamp@marum.de 0000-0002-2455-5719 D'haenens Simon Simon.Dhaenens@ees.kuleuven.be 0000-0003-1248-3188 De Vleeschouwer David ddevlees@uni-muenster.de 0000-0002-3323-807X Hull Pincelli M pincelli.hull@yale.edu 0000-0001-8607-4817 Zachos James C jzachos@ernerald.ucsc.edu 0000-0001-8439-1886 Agnini Claudia claudia.agnini@unipd.it 0000-0001-9749-6003 Pälike Heiko hpaelike@marum.de 0000-0003-3386-0923 2026 Middle Eocene astronomically-tuned benthic stable isotopes, bulk stable isotopes and Ca/Fe-ratios of IODP Expedition 342 Sites U1408 and U1410 dataset bundled publication https://doi.org/10.1594/PANGAEA.928159 2026-01-28T12:00:23 To come to a coherent middle Eocene timescale for the Atlantic, we re-evaluate the astrochronology of chrons C20n/C20r at International Ocean Discovery Program (IODP) Expedition 342 Sites U1408 and U1410 off Newfoundland. Based on the stratigraphic work of Cappelli et al., 2019 a two-site-composite for the chrons C20n and C20r (~42-46 Ma) was constructed by transferring U1410 samples to the U1408 depth-scale. We then used previously published (U1410; Vahlenkamp et al., 2018) and new (U1408) benthic and bulk stable isotopes (d^13^C and d^18^O) to derive a revised eccentricity-tuned astrochronology for the Expedition 342 composite. The astrochronologic tuning demonstrates that the contourite deposition (reflected by the Ca/Fe ratio) at the Newfoundland Ridge occurred under an amplified climatic response to obliquity during C20n and C20r – with intermittent "astronomical flickering" to precession. To further test our astrochronology we refined nannofossil datums at Site 1263 to compare with those at Site U1410 (Cappelli et al., 2019). The new chronology synchronizes time scales across the Atlantic basin. A robust middle Eocene chronology for the North Atlantic is indispensable because Expedition 342 sites host the highest-resolution middle Eocene benthic stable isotope records for this time interval. -49.785805 2.77948 -28.53283 41.438315 -42.05991396825406 31.40372096825401 2003-03-29T15:15:00 2003-04-03T13:30:00 not specified IODP Integrated Ocean Drilling Program / International Ocean Discovery Program https://www.iodp.org/ ODP Ocean Drilling Program https://www-odp.tamu.edu:443/ Ocean Drilling Program, Texas A&M University ODP http://www-odp.tamu.edu/ https://ror.org/01f5ytq51 7 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ This dataset has been carefully reviewed and curated in accordance with PANGAEA's exceptionally high quality standards. However, due to discontinued communication from the authors' side, it did not receive the usual formal approval by the authors and therefore lacks final scientific validation. Geological event | Geological e | Species | Sample Top | Sample code/label | Sample label | Sample Base | Depth, top/min | Depth top | Depth, bottom/max | Depth bot | Depth, composite revised top | Depth comp r top | Base | Depth, composite revised bottom | Depth comp r bot | Depth, composite revised, adjusted top | Depth adj rmcd top | Depth, composite revised mean | Depth comp r mean | Depth, composite revised error | Depth comp r e | Two-site-composite | Depth, composite revised, corrected | Depth corr cr | Site-specific | Nuttallides truempyi, δ18O | N. truempyi δ18O | Nuttallides truempyi, δ13C | N. truempyi δ13C | corrected to Cibicides | Laboratory | Lab | Reference/source | Reference | bulk | δ18O, carbonate | δ18O carb | δ13C, carbonate | δ13C carb | Calcium, area, total counts | Ca count | Iron, area, total counts | Fe count | Calcium/Iron ratio | Ca/Fe | Chronozone | mbsf | Depth, composite revised, corrected top | Depth corr cr top | Depth, composite revised, corrected bottom | Depth corr cr bot | mean | Two site, mean | CF | Size fraction > 0.063 mm, sand | >63 µm | Calcium carbonate | CaCO3 | Cibicides eoceanus, δ13C | C. eoceanus δ13C | Cibicides eoceanus, δ18O | C. eoceanus δ18O | sonicated citable param148821 param150460 param153369 param15372 param1555 param170900 param191268 param191269 param191270 param20622 param20784 param2094 param2095 param2177 param2178 param3 param4 param50902 param50908 param55118 param55119 param55120 param55121 param6857 param70 param7053 param790 pi50612 author25918 author31052 author47248 author50612 author50930 author56315 author900 geocode1599 geocode1600 geocode1601 inst34 license21 project3 project4048 topotype1