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Diversity and Formation of Desert Ergs: A Geologic Perspective

Explore the fascinating world of desert ergs, massive sand accumulations found in continental depressions, including detailed insights on erg morphology, dune types, and ancient examples like the Permian New Red Sandstone. Learn about the unique features of ergs and their formation processes.

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Diversity and Formation of Desert Ergs: A Geologic Perspective

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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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