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Yellow limestone

Fresnel-shaped patterns on yellow limestone at the bottom of small caves of Nahal Darokh river 4.5 miles east from Sde Boker. The Middle East, April 9, 2001
Yellow flowers of Arabian primrose (Arnebia hispidissima) on the slope of limestone hills in Harrarah (Al Kharrarah). Southern Qatar, April 23, 2016

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