Fig. 4From: Provenance of upper Permian-lowermost Triassic sandstones, Wutonggou low-order cycle, Bogda Mountains, NW China: implications on the unroofing history of the Eastern North Tianshan SutureChrono-, litho-, and cyclostratigraphy of Upper Carboniferous-Middle Triassic strata in Bogda Mountains. Wavy lines are major unconformities; dashed lines are disconformities; and hachured areas missing strata. The studied Wutonggou low-order cycle is shown in the shaded box. Modified from Yang et al. (2010, 2013) and Obrist-Farner and Yang (2015)Back to article page