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Sheepbed Member

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Paleosols of the <span class="search-highlight">Sheepbed</span> <span class="search-highlight">member</span>, Yellowknife formation, Gale Crater, Mars....
Published: 01 September 2014
Figure 2. Paleosols of the Sheepbed member, Yellowknife formation, Gale Crater, Mars. A: Analytical stations and their stratigraphic order ( McLennan et al., 2014 ): 1—Cumberland Brush, 2—Mavor, 3—Persillon, 4—Brock Inlier, 5—Nastapoka, 6—Drill RP, 7—Drillhole R4, 8—McGrath R3, 9—Wernecke Brush
Image
Geochemical mass balance of paleosols in the <span class="search-highlight">Sheepbed</span> <span class="search-highlight">member</span>, Gale Crater, ...
Published: 01 September 2014
Figure 4. Geochemical mass balance of paleosols in the Sheepbed member, Gale Crater, Mars (determined using the methods of Brimhall et al., 1992 ; Amundson et al., 2008 ). Calculations assumed constant bulk density ( Retallack, 2012 ) because of burial by 5.2 km of overburden ( Thomson et al
Journal Article
Published: 01 April 2015
American Mineralogist (2015) 100 (4): 824–836.
... the Sheepbed member of this succession contain up to ~20 wt% clay minerals. A trioctahedral smectite, likely a ferrian saponite, is the only clay mineral phase detected in these samples. Smectites of the two samples exhibit different 001 spacing under the low partial pressures of H 2 O inside the CheMin...
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Journal Article
Journal: Geology
Published: 01 September 2014
Geology (2014) 42 (9): 755–758.
...Figure 2. Paleosols of the Sheepbed member, Yellowknife formation, Gale Crater, Mars. A: Analytical stations and their stratigraphic order ( McLennan et al., 2014 ): 1—Cumberland Brush, 2—Mavor, 3—Persillon, 4—Brock Inlier, 5—Nastapoka, 6—Drill RP, 7—Drillhole R4, 8—McGrath R3, 9—Wernecke Brush...
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Image
Plot of the chemical index of alteration (CIA) versus the SO 3  contents de...
Published: 01 February 2015
and postdate the diagenesis that created clay minerals. The Gillespie and Glenelg members stratigraphically overlie the Sheepbed member. After McLennan et al. ( 2014 )
Journal Article
Journal: Elements
Published: 01 February 2015
Elements (2015) 11 (1): 27–32.
... of which is composed of fine-grained strata of the Sheepbed member and sheet-sands of the overlying Gillespie Lake member. Following brushing of the Sheepbed outcrop, high-resolution MAHLI images ( F ig . 3 ) revealed an absence of grains larger than approximately 50 μm and the presence of grooves where...
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Journal Article
Journal: Elements
Published: 01 February 2015
Elements (2015) 11 (1): 19–26.
... and postdate the diagenesis that created clay minerals. The Gillespie and Glenelg members stratigraphically overlie the Sheepbed member. After McLennan et al. ( 2014 ) ...
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Series: Geological Society, London, Memoirs
Published: 01 January 2011
DOI: 10.1144/M36.36
EISBN: 9781862394117
.... The ‘breakaway scarp’ ( Aitken 1991 b ) marks the outer edge of the Keele Formation shelf. Megaclast breccia of the Durkan Member (not shown) conformably underlies the Delthore Member and both abut the ‘breakaway scarp’ at a buttress unconformity. Ravensthroat, Hayhook and Sheepbed formations...
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Journal Article
Journal: Geology
Published: 01 January 2017
Geology (2017) 45 (1): 7–10.
...) to have formed by injection of fluidized sediment. Dotted line shows contact between the Gillespie Lake and overlying Sheepbed members of the Yellowknife Bay formation. B: Structure with circular cross section showing crude concentric stratification and a crinkly fabric. The upper left of image shows...
Journal Article
Published: 01 November 2014
American Mineralogist (2014) 99 (11-12): 2163–2164.
... term for a day) 57–100, 180–292, Curiosity analyzed soil and drilled fine-grained sediment at the Rocknest sand shadow, then the John_Klein and Cumberland outcrops of the 1.5 m thick Sheepbed unit ( Fig. 1 ). Figure 1 The Sheepbed fluvio-lacustrine mudstone unit of Yellowknife Bay, Gale Crater...
FIGURES
Journal Article
Published: 05 July 2000
Canadian Journal of Earth Sciences (2000) 37 (7): 997–1020.
... in the overlying Ingta, Backbone Ranges, and Vampire formations by MacNaughton et al. ( 1997 b ). The base of Simple Sequence One lies in the middle member of the Sheepbed Formation ( Dalrymple and Narbonne 1996 ), where it is represented by a correlative conformity that cannot be placed exactly. The part...
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Journal Article
Journal: Elements
Published: 01 February 2015
Elements (2015) 11 (1): 33–38.
... first destination in pursuing its goal of determining the stratigraphy of Gale Crater's sediments was the exposed Yellowknife Bay formation, located to the east of Bradbury Landing and several meters lower in elevation ( Grotzinger et al. 2014 ). Upon entering the lower member, called Sheepbed ( F ig...
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Journal Article
Journal: GSA Bulletin
Published: 08 March 2019
GSA Bulletin (2019) 131 (9-10): 1673–1701.
... settings, the Ice Brook Formation, which records the globally recognized ca. 640(?)–635 Ma Marinoan glaciation (Stelfox member of Aitken, 1991b ), sits directly on the Twitya Formation ( Fig. 2 ; Aitken, 1991a , b ; James et al., 2001 ; Day et al. 2004 ; Halverson et al., 2005 ; Rooney et al., 2015...
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Journal Article
Published: 01 November 2014
American Mineralogist (2014) 99 (11-12): 2234–2250.
... into a mudstone, the Sheepbed stratum, in sites named John Klein and Cumberland. The John Klein site was chosen as typical of the Sheepbed exposures and contained white-colored crosscutting veinlets. The Cumberland site was chosen for its abundance of concretionary-like structures that were relatively resistant...
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Journal Article
Journal: Elements
Published: 01 February 2015
Elements (2015) 11 (1): 45–50.
... and will travel to extremely remote locations to get samples for study. So, anticipating such a field trip, it was a surprise for the CheMin team members to find out that the analogue material most similar to the clay minerals in the Sheepbed mudstone are the clays associated with the basalts at Griffith Park...
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Journal Article
Journal: Geology
Published: 01 May 2015
Geology (2015) 43 (5): 459–462.
... for the termination of the Marinoan glaciation in Laurentia with an age of 632.3 ± 5.9 Ma from the basal Sheepbed Formation of northwest Canada, which is identical, within uncertainty, to U-Pb zircon ages from China, Australia, and Namibia. Together, these data unite Re-Os and U-Pb geochronological constraints...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 01 March 2016
GSA Bulletin (2016) 128 (3-4): 558–575.
... that an oxygenation event in the Sheepbed Formation at the Shale Lake locality in the Mackenzie Mountains of northwestern Canada ( Fig. 1 ) correlates with the first appearance of Ediacaran fossils at Sekwi Brook ∼135 km farther south ( Shen et al., 2008 ). Figure 1. Locality map of investigated...
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Journal Article
Published: 01 March 2014
Journal of Paleontology (2014) 88 (2): 205–206.
...-shaped feeding traces from the Omkyk Member, Zaris Formation, Nama Group, Namibia. To close the Ediacaran contributions, Carbone and Narbonne (2014 ) depict a view of increasing trace fossil behavioral complexity through a continuous section of Ediacaran–Cambrian sediments from the Sheepbed through...
Journal Article
Published: 05 March 2021
Canadian Journal of Earth Sciences (2021) 58 (4): 355–377.
... depositional sites along the Sheepbed – Mount Ina slope system ( Dalrymple and Narbonne 1996 ). Despite some sedimentological and thickness differences, brecciated dolostones of the Gladman member of the Last Chance Formation are correlated here with mixed siliciclastic–carbonate strata of the upper...
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Journal Article
Published: 01 March 2016
American Mineralogist (2016) 101 (3): 678–689.
... and the Sheepbed mudstone determined that both samples are composed of ~30 wt% amorphous phases ( Bish et al. 2013 ; Blake et al. 2013 ; Vaniman et al. 2014 ), and calculations of the composition of the amorphous component suggest these samples may be composed of 40–50 wt% amorphous phases (e.g., Dehouck et al...
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