Much of the valley is characterised by basaltic rock. This valley is associated with forested areas that may provide habitat for the endangered Barbary macaque, Macaca sylvanus, a primate that prehistorically had a much wider range in northern Morocco.
- C. Michael Hogan. 2008. Barbary Macaque: Macaca sylvanus, Globaltwitcher.com, ed. Nicklas Stromberg
- J.J. Macaire and C. Cocirta. 1994. Basalt Weathering and Fluvial Sedimentary Particles: Comparison of Two Watersheds in the Middle Atlas Mountains, Morocco, Journal of Sedimentary Research. Volume 64a.
- J.J. Macaire and C. Cocirta. 1994
- C. Michael Hogan. 2008
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