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. Detailed, stratigraphically well-constrained environmental reconstructionsare available for Paleocene and Eocene strata at a range of sites in thesouthwest Pacific Ocean (New Zealand and East Tasman Plateau; ETP) andIntegrated Ocean Discovery Program (IODP) Site U1356 in the south of theAustralo-Antarctic Gulf (AAG). These reconstructions have revealed a largediscrepancy between temperature proxy data and climate models in this region,suggesting a crucial error in model, proxy data or both. To resolve theorigin of this discrepancy, detailed reconstructions are needed from bothsides of the Tasmanian Gateway. Paleocene–Eocene sedimentary archives fromthe west of the Tasmanian Gateway have unfortunately remained scarce (onlyIODP Site U1356), and no well-dated successions are available for thenorthern sector of the AAG. Here we present new stratigraphic data for upperPaleocene and lower Eocene strata from the Otway Basin, southeast Australia,on the (north)west side of the Tasmanian Gateway. We analyzed sedimentsrecovered from exploration drilling (Latrobe-1 drill core) and outcropsampling (Point Margaret) and performed high-resolution carbon isotopegeochemistry of bulk organic matter and dinoflagellate cyst (dinocyst) andpollen biostratigraphy on sediments from the regional lithostratigraphicunits, including the Pebble Point Formation, Pember Mudstone and DilwynFormation. Pollen and dinocyst assemblages are assigned to previouslyestablished Australian pollen and dinocyst zonations and tied to availablezonations for the SW Pacific. Based on our dinocyst stratigraphy andpreviously published planktic foraminifer biostratigraphy, the Pebble PointFormation at Point Margaret is dated to the latest Paleocene. The globallysynchronous negative carbon isotope excursion that marks thePaleocene–Eocene boundary is identified within the top part of the PemberMudstone in the Latrobe-1 borehole and at Point Margaret. However, the high abundances of thedinocyst Apectodinium prior to this negative carbon isotopeexcursion prohibit a direct correlation of this regional bio-event with thequasi-global Apectodinium acme at the Paleocene–Eocene ThermalMaximum (PETM; 56  Ma ). Therefore, the first occurrence of the pollenspecies Spinizonocolpites prominatus and the dinocyst speciesFlorentinia reichartii are here designated as regional markers forthe PETM. In the Latrobe-1 drill core, dinocyst biostratigraphy furtherindicates that the early Eocene ( ∼  56–51  Ma ) sediments aretruncated by a ∼  10  Myr long hiatus overlain by middle Eocene( ∼  40  Ma ) strata. These sedimentary archives from southeastAustralia may prove key in resolving the model–data discrepancy in thisregion, and the new stratigraphic data presented here allow for detailedcomparisons between paleoclimate records on both sides of the TasmanianGateway.

Identification of the Paleocene–Eocene boundary in coastal strata in the Otway Basin, Victoria, Australia