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Etjo Sandstone

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Journal Article
Published: 01 August 1999
Journal of the Geological Society (1999) 156 (4): 771-777.
...NIGEL MOUNTNEY; JOHN HOWELL; STEPHEN FLINT; DOUGAL JERRAM Abstract Deposition and subsequent preservation of the Jurassic-Cretaceous Etjo Sandstone Formation of Namibia represents a complex interplay between climatic and tectonic factors and related variations in extrabasinal sediment supply...
Journal Article
Published: 01 December 2003
South African Journal of Geology (2003) 106 (4): 281-286.
...J.S. Marsh; R.S. Swart; D. Phillips Abstract A reliable 40 Ar/ 39 Ar plateau age of 180 ± 1.2 Ma (1σ) has been obtained for fresh basalt lava interbedded with aeolian Etjo Formation sandstones south-southwest of Grootfontein in northeast Namibia. This indicates that the Early Jurassic Karoo flood...
FIGURES
Journal Article
Journal: Geology
Published: 01 February 1999
Geology (1999) 27 (2): 159-162.
...Nigel Mountney; John Howell; Stephen Flint; Dougal Jerram Abstract The Cretaceous Etjo Formation is a 200-m-thick eolian and fluvial sandstone succession exposed in the Huab Basin of northwestern Namibia. Eolian sedimentation was terminated abruptly by the emplacement of flood basalts...
Journal Article
Published: 01 March 2001
Petroleum Geoscience (2001) 7 (1): 51-56.
...John Howell; Nigel Mountney Abstract This paper introduces the Cretaceous Etjo Formation of NW Namibia as a sedimentological analogue for the Leman Sandstone, the principal gas reservoir of the UK Southern North Sea. Special reference is made to the documentation of hard knowledge from the analogue...
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Journal Article
Published: 01 September 2015
South African Journal of Geology (2015) 118 (3): 311-316.
... and encompasses the boundary of Triassic and Jurassic in Southern Africa. The Formation is considered a stratigraphic equivalent of the Upper Omingonde Formation, Etjo Basin, Namibia, with the Bodibeng Sandstone Formation, Tuli Basin, Botswana, with the upper Mosolotsane Formation, Kalahari Karoo Basin. All Upper...
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Journal Article
Journal: PALAIOS
Published: 01 June 2002
PALAIOS (2002) 17 (3): 249-267.
... pedogenic nodules in the Upper Omingonde floodplain mudrocks containing concentrations of isolated dicynodont and cynodont post-cranial elements of taphonomic class H The Middle Omingonde at Etjo Mountain comprises at least 80% in-channel deposits consisting of two prominent conglomeratic sandstones...
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Journal Article
Published: 19 December 2017
Journal of Sedimentary Research (2017) 87 (12): 1314-1335.
... Etjo Formation rocks farther south in Namibia, and it is the current formation name used by the Geological Survey of Namibia (cf. Schreiber 2006 ). The Twyfelfontain Formation consists of predominantly eolian sedimentary rocks, occasional fluvial beds, and a notable fluvial sandstone...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1996
AAPG Bulletin (1996) 80 (4): 486-504.
...F. Leo Lynch ABSTRACT The spatial distribution of burial diagenetic cements in sandstones of the Frio Formation is related to permeability and fluid flow. The relationship between sandstone diagenesis and fluid flow implies that the modification of the rocks is largely the outcome of reactions...
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Journal Article
Published: 01 June 2008
Journal of Sedimentary Research (2008) 78 (6): 410-422.
... and preservation space in the Cretaceous Etjo Formation, NW Namibia : Sedimentology , v. 47 , p. 825 – 849 . Mountney , N.P. , and Jagger , A. , 2004 , Stratigraphic evolution of an aeolian erg margin system: the Permian Cedar Mesa Sandstone, SE Utah, USA : Sedimentology , v. 51 , p. 713...
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Journal Article
Published: 01 November 2003
Journal of Sedimentary Research (2003) 73 (6): 1007-1021.
...Astrid Makowitz; Kitty L. Milliken Abstract Brittle deformation, together with grain rearrangement and ductile grain deformation, is a key mechanism of compaction in sandstones. Quartz cementation, by virtue of its impact on sandstone mechanical properties, is expected to affect the compaction...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 2003
AAPG Bulletin (2003) 87 (7): 1073-1082.
..., and the Etjo Sandstone of Namibia. The Botucatu in the Paraná basin comprises the dominant unit of the Guaraní aquifer, which forms one of the world's largest freshwater reservoirs ( Gilboa et al., 1976 ; Rebouças, 1994 ; Araújo et al., 1995 ; 1999 ; CTGRM, 2001 ; Vives et al., 2001 ). The Paraná...
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Journal Article
Published: 01 March 2018
South African Journal of Geology (2018) 121 (1): 119-130.
... in Zimbabwe (Thompson, 1975; Stagman, 1978 ), the Ntane, Tsheung and Bodibeng Sandstone Formations in Botswana ( Smith, 1984 ), and the Etjo Formation in Namibia ( Visser, 1984 ; Smith et al., 1993 ; Holzförster et al., 1999 ; D’Orazi Porchetti et al., 2015 ). In Swaziland, the thickness of the Clarens...
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 2014
AAPG Bulletin (2014) 98 (1): 1-22.
..., southeast Utah–0.35°, Mountney and Jagger, 2004 ) or steeper angles (e.g., parts of the Etjo Sandstone, Namibia–as much as 4°, Mountney and Howell, 2000 , as well as examples from some very dry dune systems characterized by small dunes, which have not been addressed in this study). Thus, it is important...
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Journal Article
Journal: AAPG Bulletin
Published: 01 June 2006
AAPG Bulletin (2006) 90 (6): 873-885.
... role of brittle deformation in compaction and pressure solution, Etjo Sandstone, Namibia : Journal of Geology , v. 103 , p. 339 – 347 . Dutton , S. P. , 1997 , Timing of compaction and quartz cementation from integrated petrographic and burial history analysis, Lower Cretaceous Fall...
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Journal Article
Published: 01 May 2015
Journal of Sedimentary Research (2015) 85 (5): 529-543.
.... The provenance of the Sindong Group was studied to understand spatial and temporal variation in composition in three different parts of the basin by using integrated data on petrography, quartz SEM-cathodoluminescence (CL) analysis, and zircon Zr/Hf analysis. Although Sindong Group sandstones display wide...
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Series: AAPG Memoir
Published: 01 January 2000
DOI: 10.1306/M73705C29
EISBN: 9781629810706
... latites, and minor latites. This group overlies the Paleozoic Karoo Sequence, and at its base, the volcanics are overlying and interbedded with eolian sandstones of the Etjo Formation. Ages ( 40 Ar/ 39 Ar) from stratigraphically equivalent units in the South American Paraná Basin ( Renne et al., 1992...
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Journal Article
Published: 01 September 2010
South African Journal of Geology (2010) 113 (3): 307-334.
... of 50 m of saline, olive green clay, the Etosha Pan Clay Member, containing authigenic analcime, monoclinic K-feldspar and glauconite. Fossil suites in two local sandstones near or at the top of the clay, the Oshigambo and Ekuma Delta Sandstone Members, include various antelope, pig, zebra, quagga...
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Image
FIGURE 4 —Stratigraphy of the Omingonde Formation. (A) General view of Omin...
in > PALAIOS
Published: 01 June 2002
FIGURE 4 —Stratigraphy of the Omingonde Formation. (A) General view of Omingonde exposures beneath the capping of Etjo Formation sandstones on the southwestern end of Mount Etjo. (B) Closer view of outcrop framed in (A) showing multistoried conglomeratic sandstones (arrowed) of the Middle Omingonde
Journal Article
Published: 01 September 2002
Petroleum Geoscience (2002) 8 (3): 237-249.
... described from outcrops. The Cretaceous Etjo Sandstone of Namibia was flooded by the Etendeka flood basalts and has a preserved topography of up to 90 m ( Mountney et al . 1999 ; Jerram et al. 2000 ). The Entrada Formation of southwestern USA ( Eschner & Kocurek 1986 ; Benan & Kocurek 2000...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1997
AAPG Bulletin (1997) 81 (4): 604-623.
... microfractures (lengths of microns to millimeters) in quartz-cemented sandstones commonly are not visible using standard petrographic methods, but systematic mapping of these microfractures is possible using photomultiplier-based electron beaminduced luminescence (scanned cathodoluminescence) imaging. As shown...
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