Geology Reference
In-Depth Information
Fig. 6 Human remains
excavated from Jbel Irhoud,
Western Jbilet. a Skull of the
Juvenile Homo sapiens of Jbel
Irhoud. b Remains of jaws and
teeth of Homo Sapiens of Jbel
Irhoud. Bar scales 2 cm. Photos
taken from Smith et al. ( 2007 )
colour as indicated by the name of the site,
Jorf Lasfar
the stability of the inland and coastal ecosystems, protecting
coastal areas from erosion and the hinterland from winds and
deserti
meaning
in Arabic. The geology consists of
Cretaceous formations with neotectonic activity (Ouadia
1998 ). Furthermore, the morphological changes of the
shoreline inform the teaching of modern concepts of vertical
weathering changes in cliffs and the lateral changes of the
present shoreline (Duane 2013 ).
yellow cliff
cation. The intensive quarrying of sand from these
dunes (at 147 quarries sites, according to the Ministry of
Equipment and Transport 2013) is causing serious damage
to the environment. The recognition of just one of the
extraction sites as a designated geosite would help to dem-
onstrate the value of the dune
elds as a whole, and the
importance of preserving them, and tt would play an
important role in alerting the local population and the
decision-makers.
3.1.7 Consolidated and Unconsolidated Dunes
The coastal area of Doukkala-Abda region consists of varied
landscapes comprising mainly consolidated and unconsoli-
dated dunes (Aboumaria 1993 ; Ouadia 1998 ). The decrease
in sea level and the action of trade winds are responsible for
the development of the old dune cordons of late Pleistocene
(Soltanian) age (Weisrock 1982 ; Ouadia et al. 1993 ). These
dunes trend Northeast-Southwest and the slope is steeper on
the inland, Oulja (Coastal wetland in
3.1.8 Karst Landscapes
The Doukkala-Abda region is characterized by its karstic
features and landscapes, especially in the coastal zone where
caves, which were used and adapted by prehistoric man
during the Quaternary, are one of the most important geo-
morphological features. Two types of cave are distinguished:
dissolution caves and man-made caves. Climatic parameters
(wet),
uenced by swamp)
side, than on the Ocean side (Ouadia 1998 ), re
ecting a wind
direction from West to East (Gigout 1951 ). Both the con-
solidated and unconsolidated dunes are very important for
the geological and the structural characteristics
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