Figure 1. A) Three stratigraphic sections of synrift strata along the northern margin of the East Gobi basin. Increasing level of detail are shown from megasequence to sequence and parasequence-scales. Radiometric ages in boxes are from ash units (⁴⁰Ar/³⁹Ar, biotite separates). See Fig. 2 for key to sedimentary structures. B) General lithology log and descriptions from EGB core, showing subsurface examples of fluvial-lacustrine reservoir and source rocks.