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.

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Presentation transcript:

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.

Dune morphology

Grain size- dune wavelength

Erg morphology

Paleo-currents-dune types

Crescent dunes- Arabia

Linear seif dunes, Yemen

Linear seif dune field, Lut, Iran

Star shaped dune, Namibia

Cross-bedded dune sandstones

Bioturbation in aeolian sand

Barchan dune field, Nubra, India