“…For example, the sudden influx of voluminous volcanic and volcaniclastic material into a restricted basin can create resistant barriers and may have pronounced effect on the sediment dispersal patterns and depositional sequences (Kuenzi et al, 1979;Mueller et al, 1994). Although volcanic, pyroclastic, and sedimentological aspects of terrestrial depositional systems have been discussed by a number of authors (Smith, 1987(Smith, , 1988Smith and Swanson, 1987;Mueller et al, 1994;Altermann, 1996;Mueller and Corcoran, 2001;Mueller and Mortensen, 2002), the influence of allocyclic controls such as tectonism and volcanism on basin formation, sediment dispersal patterns and facies architecture have not been adequately addressed (cf. Sato and Amano, 1991;Corcoran et al, 1999;Kataoka and Nakajo, 2002).…”