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Deserts

Deserts.

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Deserts

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  1. Deserts Very well sorted sand accumulates in giant fields, called Ergs, up to 500,000 km3 in extent within continental depressions. Usually <200 m thick. Ergs comprise giant km-scale Draa, which in turn are built of smaller dunes, whose form vary with grain size and wind strength. Modern example: Algerian and Saudi Ergs. Ancient example: Permian New Red Sandstone, Jurassic Navajo Sandstone of Utah.

  2. Dune morphology

  3. Grain size- dune wavelength

  4. Erg morphology

  5. Paleo-currents-dune types

  6. Crescent dunes- Arabia

  7. Linear seif dunes, Yemen

  8. Linear seif dune field, Lut, Iran

  9. Star shaped dune, Namibia

  10. Cross-bedded dune sandstones

  11. Bioturbation in aeolian sand

  12. Barchan dune field, Nubra, India

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