Geology Reference
In-Depth Information
Fig. 6 Algerian craters
a Satellite view of Amguid crater;
b Satellite view of Ouarkziz
crater, c Satellite view of
Talemzane crater, d Satellite view
of Tin Bider crater; e Panoramic
view of Ouarkziz crater;
f Panoramic view of Talemzane
crater
the best preserved despite the absence of any protective
measures.
The Amguid crater is a fresh, circular cavity about 550 m
in diameter, affecting Lower Devonian sandstones (Fig. 6 a).
It has an elevated rim up to 65 m above the crater
limestones and has a raised rim up to 75 m above the crater
fl
oor.
The Tin Bider structure (Fig. 6 d) is situated about 265 km
ENE of In Salah and appears as a series of at least three
concentric annular ridges 2, 3.5 and 6 km in diameter,
respectively. The structure affects the Upper Cretaceous clay
and limestone formations, and Lower Cretaceous sandstones.
fl
oor. The
fl
ne-
grained compacted aeolian silts. The age of the crater was
estimated to be 100,000 years considering its near perfect
state of preservation (Koeberl 1994 ).
The Ouarkziz crater (Fig. 6 b, e) is located close to the
Algero-Moroccan border, 170 km in the NE of Tindouf. The
crater is a deeply eroded circular ring structure about 3.5 km
in diameter, affecting Carboniferous limestones and shales.
The Talemzane crater (Fig. 6 c, f), also known as
at center of the crater is
lled with very bright and
2.6
The Saharan Atlas Mountains
With the use of satellite images and Google Earth , aerial
views have become readily available and, as such, great and
spectacular geological structures can be observed. Over
85 % of the Algeria territory has almost no vegetation which
provides exceptional de
Daiet
El Maadna
, is located about 120 km ESE of Laghouat. It is
a simple, bowl-shaped depression of approximately 1,750 m
in diameter. The crater was emplaced in Cretaceous-Tertiary
nition of lithologies, outcrops and
geological and geomorphological structures.
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