“…The Gangdese magmatic arc is believed to have achieved an elevation of approximately three kilometres by the late Upper Cretaceous (Ding et al., 2014, 2022; Murphy et al., 1997; Xu et al., 2022). Topography of the arc massif played a considerable role in Cenozoic climate change of the interior Tibetan Plateau by enhancing the monsoonal climate system and acting as an orographic barrier to Neo‐Tethys Ocean moisture sources to the south (DeCelles et al., 2007; Ding et al., 2014; Spicer, 2017; Spicer et al., 2021; Xu et al., 2022). In ancient active‐margin settings, the sedimentary records within forearc and retroarc strata are excellent proxies for arc magmatism, paleotopography of the arc, and regional drainage patterns between the arc and associated basins (Barth et al., 2013; Capaldi et al., 2021; de Silva et al., 2015; DeGraaff‐Surpless & Graham, 2002; Malkowski, Schwartz, et al., 2017; Schwartz et al., 2021; Sharman et al., 2015).…”