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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Fransfontein Ridge
Fransfontein Ridge (Namibia) geology in the vicinity of sample DW-1. See F...
Simplified stratigraphy of the Fransfontein Ridge area around Duurwater and...
Field photographs from the Fransfontein Ridge (see Figure 9 for locations)...
The geology of the Neoproterozoic Swakop-Otavi transition zone in the Outjo District, northern Damara Orogen, Namibia
28th DeBeers Alex. Du Toit Memorial Lecture, 2004. On Cryogenian (Neoproterozoic) ice-sheet dynamics and the limitations of the glacial sedimentary record
Lithostratigraphic correlation of the Swakop Group in the Outjo District (m...
Figure 1. Carbon isotopic data from preglacial, glacial, and postglacial ca...
Outcrop belt of the autochthonous Otavi Group in northern Namibia (Hedberg,...
Measured stratigraphic sections (see inset map for locations) of the Abenab...
Photomaps and measured columnar sections in key sectors of the Fransfontein...
Field photographs from the Fransfontein foreslope (see Figure 9 for locati...
Comparisons of the carbon isotopic records of four Pliocene–Pleistocene cor...
Stratigraphic reconstruction of the SW Congo passive margin sedimentary pri...
Duration and nature of the end-Cryogenian (Marinoan) glaciation
An ice grounding-line wedge from the Ghaub glaciation (635 Ma) on the distal foreslope of the Otavi carbonate platform, Namibia, and its bearing on the snowball Earth hypothesis
Glaciogenic and associated strata of the Otavi carbonate platform and foreslope, northern Namibia: evidence for large base-level and glacioeustatic changes
Abstract Two discrete, mappable, glaciogenic formations occur within the Otavi Group, a 3±1-km-thick carbonate-dominated platform of late Neoproterozoic age, developed on the SW promontory of the Congo craton in northern Namibia and exposed in bordering late Ediacaran fold belts. Each is overlain abruptly by an expanded postglacial carbonate sequence, the younger of which begins with a globally-correlative transgressive dolopelarenite. The older Chuos glaciation (<746 Ma) occurred during a time of north-south crustal stretching. Debris derived from upturned older rocks collected in structural depressions. The younger Ghaub glaciation (635 Ma) occurred, after stretching ceased, on a thermally-subsiding marine platform and its distally-tapered foreslope. A continuous ice grounding-zone wedge (GZW) occurs on the distal foreslope, while the upper foreslope and outer platform are devoid of glacial debris and only small pockets of lodgement facies exist on the inner platform. Debris in the GZW is derived from a distinctive falling-stand wedge that is unique to the foreslope and from immediately older strata mined preferentially from the inner platform. The GZW rests on a smooth surface that includes a transverse steep-walled trough presumably cut by an ice-stream, within which is a towering doubly-crested moraine composed of composite, massive, carbonate diamictite. The surface suggests that the ice-sheet was grounded on the distal foreslope, implying a large fall in base level at a glacial maximum that predates the GZW. The glacial record ends with Fe-stained beds, rich in ice-rafted debris, that are notably absent from the moraine, upper foreslope and platform, which were apparently above sea-level at that time.