The Russian Altai is one of the world's regions where evidence has been recognized of past megafloods – the largest known fresh-water floods which discharges exceeded 1 million m3/s, or 1 Sv (Baker, 2013). More than three decades ago giant current ripples were found in Altai in the valleys of Bashkaus, Chuya, Katun and in the bottom of the Kurai Basin (Butvilovskiy 1982, 1985; Okishev 1982; Rudoi 1984), as well as in the Biya River valley (Baryshnikov 1979, 1992). A number of workers hypothesize that these features are specific facies of glacial till (Borisov and Minina 1979; Okishev 1982, 2011). However the majority of scholars interpret them as evidence of catastrophic outburst floods that resulted from water flowing from big lakes formed due to blockage of river valleys by glaciers. Later other evidence of outbursts from glacial lakes were recognized, such as spillways and distant transportation of giant rocks torn from valley sides. Paleohydraulic assessments (Baker et al., 1993; Herget, 2005; Carling et al., 2010) permit the ranking of the Altai outburst floods with depth up to 400 m, flow velocity 20-25 m/s and discharge 10-20 million m3/s close in magnitude to the well-known Missoula flooding in western USA (Baker, 2009). Several local and international workers that independently studied the Late Pleistocene and Holocene geomorphic history of Altai in the last decades have collected into this author team to present their results to the attendees of the International Association of Geomorphologists (IAG) Regional Conference "Gradualism vs catastrophism in landscape evolution" (Barnaul, Russia, July 2-4, 2015). This guide was prepared for the 7-day (July 5-11) post-conference excursion "Russian Altai in the Late Pleistocene and the Holocene: Geomorphological catastrophes and landscape rebound". The fieldtrip is scheduled as three consecutive parts (Fig. 1): (1) Upper Biya River and Teletskoye Lake, July 5-6, stops B1 – B3; (2) Middle Katun River valley, July 7-8, stops K1 – K4; (3) Lower Chuya River – Kurai Basin – Chuya Basin, July 9-10, stops C1 – C10. Тираж 120 экз.
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