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Crashsite Group

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Series: GSA Memoirs
Published: 01 January 1992
DOI: 10.1130/MEM170-p21
... The Crashsite Group of the Ellsworth Mountains, a 3,000-m-thick sequence of shallow-water, mostly marine, tan, green, and red quartzose sandstones (quartzites) and argillites, is here subdivided, in ascending order, into the Howard Nunataks Formation (1,630 m), the Mount Liptak Formation 1,070...
Journal Article
Journal: GSA Bulletin
Published: 14 July 2017
GSA Bulletin (2017) 129 (11-12): 1568-1584.
... Neoproterozoic–early Cambrian age (650–530 Ma) are a secondary component present in the upper part of this group. The passive-margin sediments of the overlying Upper Cambrian–Devonian Crashsite Group record an up-sequence increase in late Neoproterozoic–Cambrian detrital zircons (ca. 650–480 Ma). The youngest...
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Series: GSA Memoirs
Published: 01 January 1992
DOI: 10.1130/MEM170-p37
... The upper Paleozoic Whiteout Conglomerate, situated conformably upon the Crashsite Group and overlain conformably by the Polarstar Formation, may represent the entire period of Gondwanaland glaciation in West Antarctica. The formation, mainly massive diamictites, makes up about 1,000 m...
Series: GSA Memoirs
Published: 01 January 1992
DOI: 10.1130/MEM170-p393
... The 5,500+-m Paleozoic succession of the Sentinel Range includes the Heritage Group (Cambrian), the Crashsite Group (Cambrian and younger, including Devonian), the Whiteout Conglomerate (Carboniferous?), and the Polarstar Formation (Permian). All these predominantly clastic rocks were strongly...
Series: GSA Memoirs
Published: 01 January 1992
DOI: 10.1130/MEM170-p269
... An Early Devonian orbiculoid brachiopod fauna was reported by Boucot and others (1967) from the Crashsite Quartzite of the northern Heritage Range of the Ellsworth Mountains. Re-collection on this site from strata now known as Mt. Wyatt Earp Formation of the Crashsite Group (Spörli, this volume...
Series: GSA Memoirs
Published: 01 January 1992
DOI: 10.1130/MEM170-p1
... areas throughout the deposition of this group. Shallow-marine conditions prevailed during the deposition of the overlying 3,000-m-thick Upper Cambrian to Devonian Crashsite Group. This group indicates a period of tectonic stability that continued through the remainder of Ellsworth Mountains...
Journal Article
Journal: Geology
Published: 01 May 1994
Geology (1994) 22 (5): 427-430.
... and Upper Cambrian to Devonian Crashsite Group strata indicates that the Ross orogeny did affect the Ellsworth Mountains, providing additional evidence that these rocks were once part of East Antarctica. Fluvial conglomerates overlying platform carbonates of the upper Heritage Group were derived, in part...
Journal Article
Journal: GSA Bulletin
Published: 01 July 2001
GSA Bulletin (2001) 113 (7): 939-958.
..., and structural data indicate that the Middle to Upper Cambrian Heritage Group developed in a continental rift basin. Multiple observations of the crucial end-Cambrian contact between this rift sequence and the overlying Crashsite Group reveal the contact to be regionally conformable; there are localized outcrop...
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Figure 3. Summary of stratigraphic relationships along the Heritage <b>Group</b>–C...
Published: 01 July 2001
Figure 3. Summary of stratigraphic relationships along the Heritage GroupCrashsite Group boundary from throughout the Heritage Range, revealing the contact to be regionally conformable, with localized erosional unconformities at 3 of the 12 localities. D— disconformity, D?—suspected disconformity
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Figure 7. Large-scale structural map of the central nunatak <b>group</b> of Wilson...
Published: 01 July 2001
,” and basal Crashsite Group exposed in the northeast overturned limb of an F 2 anticline. Main map shows that the conformable “transition beds”–Crashsite Group contact strikes parallel to a strong D 1 fabric preferentially developed in the Minaret Formation limestone, and is refolded by F 2 folds
Series: Geological Society, London, Special Publications
Published: 01 January 2013
DOI: 10.1144/SP381.23
EISBN: 9781862396401
... locality (Planck Point) in the Crashsite Group of the Ellsworth Mountains, demonstrating that at least part of this thick succession is Early Devonian in age and that there was faunal communication via a seaway with both the Ohio Range site and also with the contiguous South Africa and Falkland Islands...
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Journal Article
Published: 01 November 2006
Geological Magazine (2006) 143 (6): 797-819.
..., 2003 ) are consistent with a Lower Palaeozoic depositional age. The pattern is similar to peaks found in the lower/middle Palaeozoic quartzite Crashsite Group of the Ellsworth Mountains to the south ( Laudon & Craddock, 1992 ), and representative of much of the Gondwana margin being deposited...
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Figure 5. Photomicrographs of textural and microstructural features of lith...
Published: 01 July 2001
Figure 5. Photomicrographs of textural and microstructural features of lithoclasts derived from the basal units of the Crashsite Group. (A) (plain polarized light) Impingement of quartz and biotite grains of the matrix into the argillaceous lithoclast have created microshears that crenulate
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Figure 1. (A) Location map of western Antarctica. Abbreviations: AP—Antarct...
Published: 01 March 2007
filled black indicate regions of rock exposure. Sample localities are represented by circled numbers and are as follows: 1—Haag Nunataks gneiss (R.2255.14), 2—Soholt Peak rhyolite (R.6354.5B), 3—Heritage Group, Frasier Ridge Formation (R.6208.2), 4—Crashsite Group, Mount Twiss Member (R.6758.4), 5
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Figure 2. Stratigraphic column for the Ellsworth Mountains succession after...
Published: 01 March 2007
Crashsite Group, Mount Twiss Member (R.6758.4), 5—Crashsite Group, Mount Wyatt Earp Formation (R.6781.8A). Numbers beside the column represent depositional ages, whereas asterisks indicate the age of sediments constrained by age determinations from clasts: 1— Rees et al. (1998) ; 2— Rees and Duebendorfer
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Figure 4. Reconstruction of part of Gondwana at ca. 500 Ma, showing crustal...
Published: 01 March 2007
—Wilkes complex. Numbered circles indicate the possible deposition locations for the samples studied in this paper: 2–4—Soholt Peak rhyolite (R.6354.5B), Heritage Group, Frasier Ridge Formation (R.6208.2), and Crashsite Group, Mount Twiss Member (R.6758.4), 5—Crashsite Group, Mount Wyatt Earp Formation (R
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Figure 4. Structural cross sections from the central Heritage Range. Positi...
Published: 01 July 2001
Figure 4. Structural cross sections from the central Heritage Range. Positions of sections are shown on Figure 1 . (A–D) Geological sections across the Heritage GroupCrashsite Group boundary demonstrating the structural continuity between the two sedimentary successions. (E–F) Composite
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Histograms of compiled data shown in  Figure 6B . Compilation was made only...
Published: 14 July 2017
indicates the number of rocks. Samples older than 1300 Ma were not included due to lack of these components in the Ellsworth-Whitmore Mountains (see discussion in the text). The kernel density estimators of the lower (L.) and upper (U.) Heritage Group, Crashsite Group, and Whiteout Conglomerate are overlaid
Journal Article
Journal: GSA Bulletin
Published: 01 March 2007
GSA Bulletin (2007) 119 (3-4): 275-288.
... filled black indicate regions of rock exposure. Sample localities are represented by circled numbers and are as follows: 1—Haag Nunataks gneiss (R.2255.14), 2—Soholt Peak rhyolite (R.6354.5B), 3—Heritage Group, Frasier Ridge Formation (R.6208.2), 4—Crashsite Group, Mount Twiss Member (R.6758.4), 5...
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Journal Article
Published: 01 September 2005
Journal of the Geological Society (2005) 162 (5): 749-761.
...-tectonic biotite granite in the central Transantarctic Mountains yielded a U–Pb age of 492 ± 2 Ma ( Stump et al . 2003 ), thus recording the end of orogenesis. The influx of quartz-rich turbidites of the Leap Year, Neptune and Crashsite Groups from the Bowers Terrane, Eastern Neptune Range and Ellsworth...
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