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Sheepbed Formation

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Journal Article
Published: 01 June 1996
Canadian Journal of Earth Sciences (1996) 33 (6): 848-862.
...R. W. Dalrymple; G. M. Narbonne Abstract The Sheepbed Formation (Ediacaran) is a 1 km thick, siliciclastic unit that overlies glacial deposits of the Ice Brook Formation and is overlain by carbonates of the Gametrail Formation. Observations in the Mackenzie Mountains indicate that the Sheepbed...
Journal Article
Published: 01 January 1989
Canadian Journal of Earth Sciences (1989) 26 (1): 129-148.
...D. Baudet; J. D. Aitken; M. Vanguestaine Abstract The acritarch assemblages of strata from the base of the Upper Proterozoic Sheepbed Formation to the base of the Lower Cambrian (Atdabanian) Sekwi Formation are described. The sections sampled are in southwestern (internal) structural units where...
Journal Article
Journal: GSA Bulletin
Published: 01 October 1994
GSA Bulletin (1994) 106 (10): 1281-1292.
.... The C- and Sr-isotopic abundances of lower Keele Formation carbonates approximate those for other pre-Varanger samples, confirming that the simple disc-like fossils of the underlying Twitya Formation predate all known diverse Ediacaran faunas. "Tepee" and Sheepbed carbonates record strong post-glacial...
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
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Paleosols of the <b>Sheepbed</b> member, Yellowknife <b>formation</b>, Gale Crater, Mars....
in > Geology
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
Journal Article
Published: 01 April 2015
American Mineralogist (2015) 100 (4): 824-836.
... ± 0.35 billion years ( Farley et al. 2014 ). However, the stratigraphic relationships between the YKB formation and either the Peace Vallis fan or the strata of lower Mt. Sharp are uncertain. In either case, strata of the YKB formation, including the clay mineral-bearing Sheepbed member, post-date...
FIGURES | View All (5)
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Multiproxy sedimentary geochemistry of the <b>Sheepbed</b>(?), June beds, Gametrai...
Published: 01 March 2016
Figure 5. Multiproxy sedimentary geochemistry of the Sheepbed(?), June beds, Gametrail, and Blueflower formations, Sekwi Brook. Individual stratigraphic sections are shown as blue lines adjacent to stratigraphic column. Carbonate carbon isotope chemostratigraphy for this section can be found
Image
Geochemical mass balance of paleosols in the <b>Sheepbed</b> member, Gale Crater, ...
in > Geology
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
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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Re-Os isochron diagrams. A: Lower Callison Lake <b>Formation</b>. B: Mwashya subgr...
in > Geology
Published: 01 May 2015
Figure 2. Re-Os isochron diagrams. A: Lower Callison Lake Formation. B: Mwashya subgroup (MJ-31–MJ-37, 172.61–179.10 m). C: Taishir Formation. D: Sheepbed Formation. All data point error ellipses are 2σ and their diameters are larger than calculated error ellipses. All isotopic composition
Journal Article
Published: 01 March 2015
Journal of Paleontology (2015) 89 (2): 281-291.
... glacial deposits in Australia (Aitken, 1991 ; James et al., 2001 ; Hoffman and Halverson, 2011 ; Calver et al., 2013 ; Macdonald et al., 2013 ), are overlain by the Ravensthroat cap carbonate and black shale of the Sheepbed Formation. The Sekwi Brook locality exposes more than...
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Journal Article
Published: 01 March 2014
Bulletin of Canadian Petroleum Geology (2014) 62 (1): 1-13.
.... 39 , p. 133 – 143 . Dalrymple R.W. Narbonne G.M. 1996 . Continental slope sedimentation in the Sheepbed Formation (Neoproterozoic, Windermere Supergroup), Mackenzie Mountains, N.W.T . Canadian Journal of Earth Sciences , v. 33 , p. 848 – 862 . Dechesne R.G. 1989...
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Journal Article
Published: 01 March 2014
Bulletin of Canadian Petroleum Geology (2014) 62 (1): 14-36.
...M.D. Smith; R.W.C. Arnott; G.M. Ross Abstract The approximately 608 Ma Old Fort Point Formation (OFP) is a unique, mixed siliciclastic and carbonate stratigraphic marker horizon exposed locally over an area of about 35 000 km 2 within the Neoproterozoic Windermere Supergroup (WSG) of the southern...
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Multiproxy sedimentary geochemistry of the Twitya and Ice Brook <b>Formations</b> ...
Published: 01 March 2016
percent total organic carbon (TOC). Abbreviations: Shez.—Shezal Formation, I.B.—Ice Brook Formation, Raven.—Ravensthroat formation, Sheep.—Sheepbed Formation. Lithologic log: s—shale, fs—fine sand, ms—medium sand, cs—coarse sand, cg—conglomerate. Coarser-grained samples from the Ice Brook Formation
Journal Article
Published: 20 August 2004
Canadian Journal of Earth Sciences (2004) 41 (9): 1013-1025.
... by the Rapitan glacial interval (Sayunei and Shezal formations), followed by the interglacial Twitya Formation and the younger tillites of the Ice Brook and Keele formations. The younger tillite is overlain in turn by deep-water shale of the Sheepbed Formation, deep-water carbonates (Gametrail Formation), deep...
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Journal Article
Published: 05 July 2000
Canadian Journal of Earth Sciences (2000) 37 (7): 997-1020.
.... Paleocurrent measurements are sparse, but indicate flow to the west and southwest. This FA is broadly similar to Dalrymple and Narbonne’s ( 1996 ) FA 6 from the Sheepbed Formation. Prior to our work, the oldest record of trace fossils in the Mackenzie Mountains was from the lower member...
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Comparison of redox and preservational controls on the stratigraphic distri...
Published: 01 March 2016
Figure 8. Comparison of redox and preservational controls on the stratigraphic distribution of macrofossils at Bluefish Creek and Sekwi Brook. Abbreviations: Shez.—Shezal Formation, I.B.—Ice Brook Formation, Rav.—Ravensthroat formation, Sheep.—Sheepbed Formation; B.B.R.—Backbone Ranges Formation
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(A) Field photograph of the middle part of the Windermere Supergroup at loc...
Published: 22 August 2001
Fig. 4. (A) Field photograph of the middle part of the Windermere Supergroup at locality D. The light buff of the cap carbonate contrasts with the darker hues of the underlying Keele Formation (lower right) and overlying Sheepbed (recessive dark shale) and Gametrail (resistant carbonates, upper
Journal Article
Published: 01 January 2008
Journal of Paleontology (2008) 82 (1): 1-36.
..., forming census populations underneath volcanic ash layers throughout a more than 1 km thick turbiditic sequence. The exposed fossiliferous units comprise the Mistaken Point, Trepassey, Fermeuse, and Renews Head formations. The remains are tectonically deformed, with long axes of elliptical discs aligned...
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Location map for the Sekwi Brook and June Lake study areas, showing distrib...
Published: 05 July 2000
the Sheepbed Formation, which in turn underlies the Gametrail Formation. The Sekwi Brook study area (the main focus of this study) lies to the west (i.e., on the deep-water side) of the Gametrail shelf edge, but lies on the Risky shelf.