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Rasthof Formation

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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP418.7
EISBN: 9781862397163
...Abstract Abstract The Rasthof Formation is a mid-Cryogenian cap carbonate succession deposited in Namibia following the Sturtian glaciation. It includes a microbial member, typically >100 m thick. This member exhibits contorted intervals, and is divisible into two informally defined units...
FIGURES | View All (8)
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Stratigraphic columns of the <span class="search-highlight">Rasthof</span> <span class="search-highlight">Formation</span> at the four localities. Colo...
Published: 01 February 2013
FIGURE 2— Stratigraphic columns of the Rasthof Formation at the four localities. Colored dots at Ombepera and South Ombepera mark the stratigraphic positions of fossiliferous and unfossiliferous samples, respectively. Fossiliferous samples from Ongongo and Okaaru described in Bosak et al. (2011a
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Geological map of the <span class="search-highlight">Rasthof</span> <span class="search-highlight">Formation</span> showing the fossiliferous localitie...
Published: 01 February 2013
FIGURE 1— Geological map of the Rasthof Formation showing the fossiliferous localities. Inset map of Namibia in southern Africa shows mapped area in the north. Geological map shows the four localities: Ombepera  =  A, South Ombepera  =  B, Okaaru  =  C, and Ongongo  =  D. Stratigraphic names used
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Representative morphologies of tubular tests from <span class="search-highlight">Rasthof</span> <span class="search-highlight">Formation</span> (Namibi...
Published: 01 January 2012
Figure 2. Representative morphologies of tubular tests from Rasthof Formation (Namibia). All images are scanning electron micrographs. A−E: Tubular tests with transverse constrictions ( t ) and folds ( f ). F: Aperture of B showing small mineral grains on exterior and in lumen (arrows). G
Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/SP286.7
EISBN: 9781862395343
...Thin section data Columnar sections were measured in the Khowarib-Warmquelle area, with particular emphasis on the rhythmite part of the Rasthof Formation (Fig.  2 ). The same set of dark- and light-coloured carbonate rhythmites and thin reddish clay layers, as well as some turbidite layers...
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Journal Article
Journal: PALAIOS
Published: 01 February 2013
PALAIOS (2013) 28 (2): 67–79.
...FIGURE 2— Stratigraphic columns of the Rasthof Formation at the four localities. Colored dots at Ombepera and South Ombepera mark the stratigraphic positions of fossiliferous and unfossiliferous samples, respectively. Fossiliferous samples from Ongongo and Okaaru described in Bosak et al. (2011a...
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Journal Article
Journal: Geology
Published: 21 October 2020
Geology (2021) 49 (3): 263–267.
...) contains abundant dropstone-bearing intervals and striated clasts. It is capped by the Rasthof Formation, composed of laminites in its lower portion and microbial carbonates above. These laminites are locally found to contain pebble- and granule-sized lonestones in abundance. At the Omutirapo outcrop...
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Journal Article
Journal: Geology
Published: 01 January 2012
Geology (2012) 40 (1): 67–70.
...Figure 2. Representative morphologies of tubular tests from Rasthof Formation (Namibia). All images are scanning electron micrographs. A−E: Tubular tests with transverse constrictions ( t ) and folds ( f ). F: Aperture of B showing small mineral grains on exterior and in lumen (arrows). G...
FIGURES
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Field images from the syn-glacial half graben on Toekoms farm. (A) View loo...
Published: 01 June 2017
black band is the Rasthof Formation (unit Ar) cap limestone. (B) Parallel-laminated silty argillite in the upper part of columnar section N. (C) Ice-rafted dropstones of granodiorite (G) and quartz-arenite (Q) in parallel-laminated silty argillite from the upper part of columnar section N. (D) Graded
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(A) Stratigraphy of the Otavi Group, Namibia. Maximum age constraint for th...
Published: 21 October 2020
age from U-Pb dating of ash beds ( Hoffman et al., 1996 ). (B) Summary sedimentary logs of the uppermost part of the Chuos Formation (base not shown) and the lower part of the Rasthof Formation at both Omutirapo and Rasthof Farm. VC—very coarse.
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Composite boron and carbon (B, C) isotope record and paleo-pH reconstructio...
Published: 01 September 2010
of inferred Neoproterozoic climatic normalcy. Arrow indicates inferred transient ocean acidification event. Note that the stratigraphic interval between top of Rasthof Formation and base of Ombaatjie Formation at Fransfontein and at Entrance was not sampled; stratigraphic thicknesses are 14 m and 283 m
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North wall of the Omutirapo paleovalley, viewed from the south. Chuos Forma...
Published: 01 June 2017
Figure 7. North wall of the Omutirapo paleovalley, viewed from the south. Chuos Formation (unit Ac) thickens southward from 65 to 450 m in the field of view, incised into the Okakuyu (unit Ok) and Devede (unit Od) Formations. Beesvlakte Formation is unit Ob; Rasthof Formation is unit Ar. Note
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Inclined satellite view looking westward at the north-facing south wall of ...
Published: 01 June 2017
columns 2 and 4, Figs. 5 , 9 ). Other units: Ar—Rasthof Formation; Ag—Gruis Formation; Ab—Ombaatjie Formation.
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Geologic map of a part of the eastern Kaoko belt (location,  Fig. 3 ), show...
Published: 19 January 2016
of the Rasthof Formation at location a is tentatively interpreted as a lateral ramp. [Colour online.]
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Photomicrographs of walled tests in thin sections of microbialaminites from...
Published: 01 January 2012
Figure 1. Photomicrographs of walled tests in thin sections of microbialaminites from basal Rasthof Formation at Okaaru (Namibia). Widths (10–15 μm) and lengths (110–400 μm) of tubular structures visible in thin sections are comparable to dimensions of smaller extracted tubular microfossils. A, B
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Inclined satellite view of the incised Sturtian paleovalley at Omutirapo sp...
Published: 01 June 2017
) growth fault, which may have localized Sturtian incision. Chuos Formation is 500 m thick in the paleovalley axis ( Fig. 7 ), 10× thicker than outside the paleovalley. Units above the Rasthof Formation ( Fig. 4 ) are not shown for simplicity. Numbered light-blue lines are the measured sections of Figure
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(A) Outcrop view of section at <span class="search-highlight">Rasthof</span> Farm (Namibia), showing vertically i...
Published: 21 October 2020
Figure 4. (A) Outcrop view of section at Rasthof Farm (Namibia), showing vertically inclined strata that young toward the left side. Position of the profile in Figure 2 is shown; i.e., location of the lonestone-bearing strata in the Rasthof Formation. Field of view in foreground is ∼50 m. (B
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Stratigraphic relationships and lonestone-bearing strata at Omutirapo, Nami...
Published: 21 October 2020
Figure 3. Stratigraphic relationships and lonestone-bearing strata at Omutirapo, Namibia. (A) Stratigraphic contact between sheared diamictites of the Chuos Formation (below the hammer) and dololaminites of the basal Rasthof Formation (above the hammer). Hammer is ∼30 cm long. (B) Tripartite
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Vertical satellite view of the south end of the Vrede south dome, showing t...
Published: 01 June 2017
Figure 14. Vertical satellite view of the south end of the Vrede south dome, showing thickening of Sturtian diamictite in the Chuos Formation (unit Ac) and the locations of columnar sections 2–5 and C–L. White dashed line indicates the thin Rasthof Formation (cap limestone) draping the Chuos
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Autochthonous columnar sections of the Abenab and basal Tsumeb Subgroups on...
Published: 01 June 2017
), also the base of the Ediacaran Period. Soutput fault slip ended by middle Ghaub Formation time, and Toekoms by Rasthof Formation time. Soutput fault was not structurally inverted, likely because its strike nearly parallels the direction of Damaran shortening. Note localized thickening of the Marinoan