1 / 12

Deserts

Deserts.

jayme
Télécharger la présentation

Deserts

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related