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Syngenetic  permafrost  deposits  formed  extensively on and around the arising Beringian subcontinent during  the  Late  Pleistocene  sea  level  lowstands.  Syngenetic deposition  implies  that  all  material,  both  mineral  and  organic, freezes parallel to sedimentation and remains frozen until degradation of the permafrost. Permafrost is therefore a  unique  archive  of  Late  Pleistocene  palaeoclimate.  Most studied permafrost outcrops are situated in the coastal lowlands of northeastern Siberia; inland sections are, however, scarcely available. Here, we describe the stratigraphical, cryolithological, and geochronological characteristics of a permafrost sequence near Batagay in the Siberian Yana Highlands,  the  interior  of  the  Sakha  Republic  (Yakutia),  Russia, with focus on the Late Pleistocene Yedoma ice complex (YIC). The recently formed Batagay mega-thaw slump exposes permafrost deposits to a depth of up to 80 m and gives insight into a climate record close to Verkhoyansk, which has the most severe continental climate in the Northern Hemi-\udsphere. Geochronological dating (optically stimulated luminescence, OSL, and 14C ages) and stratigraphic implications delivered a temporal frame from the Middle Pleistocene to the  Holocene  for  our sedimentological  interpretations  and also revealed interruptions in the deposition. The sequence\udof  lithological  units  indicates  a  succession  of  several  distinct climate phases: a Middle Pleistocene ice complex indicates cold stage climate. Then, ice wedge growth stopped due to highly increased sedimentation rates and eventually a rise in temperature. Full interglacial climate conditions existed  during  accumulation  of  an  organic-rich  layer  –  plant macrofossils reflected open forest vegetation existing under\uddry conditions during Marine Isotope Stage (MIS) 5e. The Late Pleistocene YIC (MIS 4–MIS 2) suggests severe cold-stage climate conditions. No alas deposits, potentially indicating thermokarst processes, were detected at the site. A detailed comparison of the permafrost deposits exposed in the Batagay thaw slump with well-studied permafrost sequences,both coastal and inland, is made to highlight common features and differences in their formation processes and palaeo-climatic  histories.  Fluvial  and  lacustrine  influence  is  tem-orarily  common  in  the  majority  of  permafrost  exposures, but has to be excluded for the Batagay sequence. We interpret  the  characteristics  of  permafrost  deposits  at  this  location as a result of various climatically induced processes that are partly seasonally controlled. Nival deposition might have been dominant during winter time, whereas proluvial and aeolian deposition could have prevailed during the snowmelt period and the dry summer season

Palaeoclimate characteristics in interior Siberia of MIS 6–2: first insights from the Batagay permafrost mega-thaw slump in the Yana Highlands