Site Logata River 3 (Fig. 1; sediment logs are in Fig. 19 in [1]). (A) The 2 km long river cliff with sediments documented at four sites LoR 3a-d. (B) Topmost unit D (LoR 3d) which is ‘ice-complex’ silt, rich in organic debris and with syngenetic ice wedges. An arrow indicates the skull of step bison (C) together with a high number of other bison skeleton parts, suggesting that a mostly intact animal body is present in the sediments. (C) Partly melted-out step bison (Bison priscus) skull; age is c. 43 cal ka BP. (D) Megafauna remains (mammoth tusks and scapulas), sampled on the river beach below outcropping ice-complex sediment at site LoR 3. (E) LoR 3a, ∼32–33 m (unit D); syndepositionally block-slumped ripple laminated sand, with post-slump erosion (CoGlg), followed by alternating Spp and Sr(A) beds. (F) LoR 3, ∼27.4–28.8 m (unit D); interbedded planar cross-bedded, planar parallel-laminated and ripple laminated sand. Note the high content of organic debris in some beds, seen up-scaled in panel H. (G) LoR 3a, ∼33–34.4 m (unit D); planar parallel-laminated sand interbedded with ripple trough cross-laminated sand. (H) Up-scaled upper part of (F) with Sr(B) sand with a high organic debris content in ripple troughs and foresets. (I) LoR 3b, ∼24.5–25 m (unit C); marine, rhythmically laminated clay.