 Chalky limestone in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Pebbles covering lithified sand dune in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Sand covering gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Pebbles covering layers of lithified sand dune in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Chalky deposits of marine Miocene Dam Formation in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Round chalky deposits of marine Miocene Dam Formation in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Sand covering gypsum crystals (selenite) in area of Jebel Al-Nakhsh (Khashm an Nakhsh) in south-western Qatar, March 11, 2016
 Arfaj (Rhanterium epapposum) growing on sand covering gypsum crystals (selenite) in area of Jebel Al-Nakhsh (Khashm an Nakhsh) in south-western Qatar, March 11, 2016
 Blooming Arfaj (Rhanterium epapposum) growing on sand covering layers of gypsum crystals (selenite) in area of Jebel Al-Nakhsh (Khashm an Nakhsh) in south-western Qatar, March 11, 2016
 Milkweed Glossonema varians on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Seedling of Fagonia ovalifolia(?) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Sand button (creeping thorn rose, Neurada procumbens, local name saadan) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Slabs of gypsum crystals (selenite) with sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Hairy leaves of Astragalus eremophilus(?) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 White flowers of Eremobium aegyptiacum (to the left) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Stork bill (Monsonia nivea, Erodium neveum) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Launaea capitata (local names huwa, hazan) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Compact seedling of desert plant Zygophyllum qatarense among sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Desert rock carved by drifting sand (aeolian abrasion) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Lithified (compacted and hardened, turned to stone) sand dune in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Limestone mushroom in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Hairy leaves of milkvetch Astragalus arpilobus subsp. hauarensis in sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Leaves of stork bill (Monsonia nivea, Erodium neveum) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Stork bill with seeds (Monsonia nivea, Erodium neveum) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Stork bill with a flower (Monsonia nivea, Erodium neveum) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Stratified layers of limestone and Miocene deposits of the Dam Formation on the slope of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Mushroom shaped limestone rock in area of Jebel Al-Nakhsh (Khashm an Nakhsh) in south-western Qatar, March 11, 2016
 Rosette of leaves of stork bill (Monsonia nivea, Erodium neveum) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Hairy leaves of milkvetch Astragalus arpilobus subsp. hauarensis submerged in sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Haloxylon salicornicum (Hammada elegance local names remith, hamd) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Sand button (creeping thorn rose, Neurada procumbens, local name saadan) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Seedling of Zygophyllum qatarense (Tetraena qatarense) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Brown lily (Dipcadi erythraeum, local names mesailemo, besailemo) with flower buds on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Flower buds of Brown lily (Dipcadi erythraeum, local names mesailemo, besailemo) on sand in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Sand and sky ripples in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Sand and rocks in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Sand and sky texture in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Sand ripples in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Windblown sand with rocks in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Windblown sand with ripples in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Sand and cloud ripples in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Geologist Jacques LeBlanc at the foot of ancient lithified dune of red sand guiding a fossil tour for Qatar Natural History Group (QNHG) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Grass Pennisetum divisum on windblown sand in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Bird tracks in windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Plant of Leptadenia pyrotechnica in windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Plant of Anabasis setifera in windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Sand mounds with plants of Anabasis setifera on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Stones and pebbles in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Greater plantain (Plantago boissieri) on windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Lithified (compacted and hardened, turned to stone) sand dune in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Orange lithified (compacted and hardened, turned to stone) sand dune in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Marine Miocene Dam Formation in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Dried stem of Zygophyllum in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Layers of Miocene Dam Formation in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Cornulaca monacantha (local names thalj, thallaj) in windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Cornulaca monacantha (local names thalj, thallaj) on windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Layers of gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 White gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Patterns of gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Slabs of gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Seedling of Zygophyllum qatarense plant in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Pavement by gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Slab of gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Succulent twig of Zygophyllum qatarense plant in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Protruding layers of gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Polycarpaea repens on gypsum pavement (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Patterns of layers of gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Texture of protruding gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Grass growing on layers of gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Green seedling of desert plant Zygophyllum qatarense in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Tiny flower of lunaria (Savignya parviflora, local name Gilgilan) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Habitat of dyer s croton (giradol, Chrozophora tinctoria, local names Tanoom, zerraij, tannom) in windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Plant of dyer s croton (giradol, Chrozophora tinctoria, local names Tanoom, zerraij, tannom) in windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Woolly plant of dyer s croton (giradol, Chrozophora tinctoria, local names Tanoom, zerraij, tannom) in windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Blooming plant of dyer s croton (giradol, Chrozophora tinctoria, local names Tanoom, zerraij, tannom) in windblown sand on roadside in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, June 10, 2016
 Flower bud of Brown Lily (Dipcadi erythraeum, local names mesailemo, besailemo) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Members of the Qatar Natural History Group (QNHG) exploring area of gypsum crystal pavement (selenite) during fossil trip in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Climbing an orange lithified (hardened) sand dune in area of Jebel Al-Nakhsh in south-western Qatar, April 2, 2016
 Zygophyllum simplex (Tetraena simplex, local name Daa, harm, hureim) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Members of the Qatar Natural History Group (QNHG) exploring glittering gypsum pavement (selenite) during fossil trip in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Sunrise in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Orange lithified (compacted and hardened, turned to stone) sand dune in area of Jebel Al-Nakhsh in south-western Qatar, April 2, 2016
 Haloxylon salicornicum (Hammada elegance, local names remith, hamd) growing on layers of gypsum crystals (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Haloxylon salicornicum (Hammada elegance, local names remith, hamd) growing in cracks of gypsum pavement (selenite) in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Edge of a plateau in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Rippled texture in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Small wadi in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Rock layers in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Gypsum plateau in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Stony plateau in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Acacia tortilis(?) in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Exposed pebbles in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Stone mushroom in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Plateau with pebbles in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Members of the Qatar Natural History Group (QNHG) exploring fossilised intertidal stromatolites (microbial mats, laminated sediments) during fossil trip in area of Jebel Al-Nakhsh in south-western Qatar, February 7, 2014
 Grass Stipagrostis obtusa in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Gypsum pavement (selenite) in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
 Gypsum rocks (selenite) in area of Jebel Al-Nakhsh (Khashm an Nakhsh). South-western Qatar, March 25, 2016
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