Fig. 3

(a, c, e) Hand specimen photographs and (b, d, f) microscopic photos of sandstone samples from the GS, XQS and DS sections. Abbreviations: Qm-monocrystalline quartz; Qp-polycrystalline quartz; Pl-plagioclase; Kfs-K-feldspar; Ls-lithic fragments of sedimentary rocks; Lm-lithic fragments of metamorphic rocks; Lv-lithic fragments of volcanic rocks.