Fig. 1

a Location of the Oasis and BP impact structures in eastern Libya (GMTED at 240 m/px, colorized shaded relief) and b topographic setting of the Oasis impact crater (SRTM at 30 m/px, colorized shaded relief). c Landsat 8 ETM pan-sharpened PC representation with principal components 1–3 represented as RGB (15 m/px). Location of subfigure d marked by white box. d Same image basis with close-up of the Oasis impact structure, labels IB and IR refer to occurrences of inselbergs and remnants of the inner ring structure, respectively. The center of the impact structure is located at 24°24′E, 24°34′N