Etjo Fm
Period:
Jurassic
Age Interval:
Early Jurassic (Pliensbachian)
Province:
SouthAfrica-Namibia-Botswana
Type Locality and Naming
Lithology and Thickness
Massive, highly mature, fine- to medium-grained quartzitic sandstones displaying large-scale aeolian cross-bedding. Thickness varies significantly but can reach up to nearly 100 meters in the Waterberg area.
Lithology Pattern:
Sandstone
Relationships and Distribution
Lower contact
overlies the Triassic red beds of the Omingonde Fm in the Waterberg Basin
Upper contact
In many areas, like the Waterberg Plateau, it forms the modern erosional capping surface.
Regional extent
Central and northwestern Namibia (particularly prominent in the Waterberg, Huab, and Goboboseb areas). Upper Stormberg Gr equivalent. Regionally equivalent to the Clarens Fm in the Main Karoo Basin (South Africa) and the Botucatu Fm in the Paraná Basin (Brazil).
GeoJSON
null
Fossils
Age
Early Jurassic (Pliensbachian)
Age Span:
Beginning stage:
Pliensbachian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
192.90
Ending stage:
Bathonian
Fraction up in the ending stage:
1.0
Ending date (Ma):
165.29
Depositional setting
Aeolian
Depositional pattern:
Additional Information
Compiler:
From the O. Catuneanu et al. / Journal of African Earth Sciences 43 (2005) 211–253; Mountney, N. P., et al. (1998). Aeolian facies models for the Lower Jurassic Etjo Formation, Namibia. Sedimentology.