Fig. 4: Results of sedimentary analysis.
From: Abandonment of ancient cities near the Salawusu River valley, China, triggered by stream capture
a Profile of col and misfit with 3 trial pits about 1 m deep. b (i)–(iii) Vertical profiles of the 3 trial pits, each containing a layer of coarser grained sand (medium-sized sand, refer to grain size distributions in g1-g3). c The slope directions of col and misfit, and a gully (marked with a white star) next to col shown in Google Earth satellite image. d Field photograph of the col valley that slopes inland. e Field photograph of the gully, sloping towards the reservoir, with its stratigraphic profile. The gully is marked with a white star in the Google image and has the same strata as the col and misfit. f Field photograph of a modern river below the ancient city. The white triangle marks the sampling point. g The grain size distribution of the samples taken from the study area: g (i)–(iii) the grain size distribution of the samples taken at different depths from the 3 trial pits. The grain size of coarse sand in each pit is indicated by the vertical red-orange band or red distribution curves in the plots; (g) (iv) the grain size distribution of samples taken from different layers of the stratigraphic profile of the gully (marked with a white star in Fig. 4c and 4e) next to the col and misfit; (g) (v) the grain size distribution of sedimentary samples taken from the strata of the ancient city (see Fig. 1b) and the modern river below the city (marked with a white triangle in Fig. 4f). Google Earth Maps data: Image @2022 CNES/Image @2022 Maxar Technologies.
