Fig. 4From: Paleosols in an outcrop of red beds from the Upper Cretaceous Yaojia Formation, southern Songliao Basin, Jilin Province, NE ChinaPhotographs showing field characteristics of the soil horizons in paleosols of the Yaojia Formation. a Calcic horizon (Bk) recognized by calcareous layers (marked with yellow arrows); note the greyish green claystone (under the black dotted line) and greyish white very-fine sandstone (under the yellow dotted line) indicating discontinuity of the petrogenesis process; b Greyish green mottles in gleyed horizon (Bg) of the paleosols (marked with yellow arrows); note the shiny clay films in the argillic horizons (Bt) marked with black arrows; c Reticular, mottled red paleosols in gleyed horizon (Bg) (marked with yellow arrow); d Slickensides recognized by polished and striated stress surface in the vertic horizon (Bw) of paleosols (marked with a yellow arrow); burrows are found in the overlying cross-bedded red siltstone (marked by the dotted line), indicating the pedogenesis interrupted by deposition of the siltstone; e Cutans on inclined planes in the argillic horizon (Bt) marked with yellow arrows; f Cutans on vertical planes (marked with yellow arrows) in the argillic horizon (Bt) with subangular blocky structureBack to article page