Wallbridge Discontinuity

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Journal Article
Journal: AAPG Bulletin
Published: 01 October 1974
AAPG Bulletin (1974) 58 (10): 2216.
... prediction of exploration trends. The largest fluctuations of sea level are at the base of the Sauk sequence (Cambrian transgression), the Owl Creek discontinuity (base of the Middle Ordovician), the Wallbridge discontinuity (end of the Early Devonian), and the discontinuity at the base of the Absaroka...
Series: GSA Special Papers
Published: 01 January 1985
DOI: 10.1130/SPE201-p91
... across the basin, (7) tidal amplitude, (8) longshore drift, and (9) intensity of mass wastage of the delta front. Deposition of prodelta muds immediately above the Oriskany Sandstone and Wallbridge Discontinuity began the history of the Catskill Delta complex. The initiation of prodelta siltstones...
Journal Article
Journal: AAPG Bulletin
Published: 01 April 1984
AAPG Bulletin (1984) 68 (4): 470.
... beneath the overthrust, and the post-Sauk unconformity probably disappears. Middle Ordovician siliciclastics coarsen eastward toward the Blount delta. The Wallbridge discontinuity expands eastward, so that Silurian and Lower Devonian strata probably do not occur beneath the metamorphic overthrust. The pre...
Journal Article
Journal: AAPG Bulletin
Published: 01 August 1963
AAPG Bulletin (1963) 47 (8): 1497–1526.
... genetically, their patterns are discussed together. The eastern North American succession between the sub-Silurian Taconic unconformity and the intra-Lower Devonian (pre-Oriskany) Wallbridge discontinuity is here defined as the Tutelo Sequence. Its name is derived from the Tutelo Tribe whose domain...
Journal Article
Published: 04 June 2014
Canadian Journal of Earth Sciences (2014) 51 (7): 715–729.
... geological setting of the Sudbury Igneous Complex (SIC) along Lithoprobe seismic transect, while an east–west profile was selected to examine a discontinuity in the magnetic and gravity fields near the centre of the SIC in the North Range. Constraints imposed on the best-fit model were the location...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1985
AAPG Bulletin (1985) 69 (5): 722–732.
... of the Cincinnati arch ( Figure 2 ). This hiatus—the Wallbridge hiatus or discontinuity of Wheeler (1963) —is due to a major eustatic sea level drop that was most pronounced immediately following deposition of the Oriskany, or just before deposition of the Onesquethaw strata ( Dennison and Head, 1975...
FIGURES | View All (12)
Journal Article
Journal: AAPG Bulletin
Published: 01 August 1971
AAPG Bulletin (1971) 55 (8): 1179–1193.
.... The region with true delta or prodelta influence is probably confined to the area in which the total Devonian thickness exceeds 500 ft ( Oliver et al. , 1967 , Fig. 10). At the approximate time of Deerpark deposition, seas withdrew from the continent to form the Wallbridge discontinuity ( Wheeler...
FIGURES | View All (9)
Journal Article
Journal: Interpretation
Published: 26 July 2013
Interpretation (2013) 1 (1): T25–T43.
..., it is known that since that map was published, more high-resolution geophysical imagery of the Sudbury Structure has become publicly available. The authors of the present study are of the opinion that a qualitative geophysical interpretation of magnetic contacts, lineaments, and discontinuities based...
FIGURES | View All (13)
Journal Article
Published: 09 November 2017
Canadian Journal of Earth Sciences (2018) 55 (3): 230–240.
.... Geochemical data from Wallbridge Mining Company Limited was also included as a part of this study ( Table 2 ; Fig. 2 ). Clasts larger than ∼1 cm were removed from these samples, using visual inspection. Samples were sent to ALS Minerals and were ground to a fine powder. Two hundred and fifty milligrams...
FIGURES | View All (8)
Series: Special Publications of the Society of Economic Geologists, Special Publications of the Society of Economic Geologists
Published: 01 January 2010
DOI: 10.5382/SP.15.2.12
EISBN: 9781629490403
... to mineralization from other styles of alteration in the Sudbury Igneous Complex footwall. The present study is based on detailed alteration mapping of stripped outcrops of the Wisner property in the North Range that are owned by a joint venture of Wallbridge Mining Company Ltd. and Xstrata Nickel. Although...
FIGURES | View All (17)
Series: SEPM Special Publication, SEPM Special Publication
Published: 01 January 2004
DOI: 10.2110/pec.04.79.0055
EISBN: 9781565762152
... of the Kaskaskia Sequence just above the Wallbridge Discontinuity ( Dennison et al., 1992 ). As such, the lower Oriskany was deposited immediately following a sea-level lowstand. Much of the Oriskany was deposited during a highstand in sea level, and therefore only the lower Oriskany represents a transgressive...
FIGURES | View All (22)
Journal Article
Published: 25 February 2020
Canadian Journal of Earth Sciences (2020) 57 (11): 1324–1336.
... of the Sudbury impact structure. FWBX is yet another enigmatic type of breccia at Sudbury. Also referred to as Granite Breccia by some workers (e.g., see Lightfoot 2016 and references therein), FWBX occurs as discontinuous bodies from 10s to ∼400 m thick underlying the Main Mass of the SIC, almost...
FIGURES | View All (9)
Journal Article
Journal: Geology
Published: 01 August 2001
Geology (2001) 29 (8): 747–750.
... in the country rocks and the injection of impact melts into the fractures ( Pattison, 1979 ; Grant and Bite, 1984 ). Thus, the quartz diorite dikes were present as melt-filled discontinuities during the advanced stages of evolution of the impact crater. The Copper Cliff dike ( Figs. 1 and 2 ) strikes...
FIGURES | View All (4)
Journal Article
Published: 05 December 2019
Geochemistry: Exploration, Environment, Analysis (2020) 20 (3): 337–356.
... by bedrock outcrop and thin (<2 m) discontinuous till veneer over bedrock ( Bajc 1997 a ). Prior to the removal of the overburden in 2011, the Broken Hammer deposit was overlain by 1–3 m of till. In general, till across the North Range is thin (<0.5–3 m thick), locally derived, loose, and contains...
FIGURES | View All (11)
Journal Article
Journal: Interpretation
Published: 22 April 2015
Interpretation (2015) 3 (2): SL63–SL81.
... of high-resolution airborne geophysical data ( Olaniyan et al., 2013 ) have not provided an adequate explanation of some extensive geophysical anomalies observed within the SIC (Figure  1a and 1b ). These include (1) the abrupt discontinuity of the high magnetic intensity in the north range around...
FIGURES | View All (14)
Series: GSA Field Guide
Published: 10 December 2018
DOI: 10.1130/2018.0051(03)
EISBN: 9780813756516
... and sedimentation patterns. Sequence stratigraphy provides a heuristic model that links physical processes with predictable changes in the distribution of facies, biotas, and discontinuities ( Brett, 1995 , 1998 ; Witzke et al., 1996 ; Holland and Patzkowsky, 1996 , 2007 ). In this paper, we will explore...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP314.2
EISBN: 9781862395626
... surface contacts include: the top-Smyrna Bed unconformity (3) and the top-Fillmore Glen corrosional discontinuity (5). Diagnostic and/or common taxa include: ( a ) Heliophyllum halli ; ( b ) Spinatrypa spinosa ; ( c ) large bryozoans; ( d ) Mediospirifer audaculus ; ( e ) Allanella tullius ; ( f...
FIGURES | View All (19)
Journal Article
Journal: Geophysics
Published: 12 May 2014
Geophysics (2014) 79 (3): E115–E123.
...: NSERC, Vale, Sudbury Integrated Nickel Operations, a Glencore Company, Wallbridge Mining, KGHM International, and the Centre for Excellence in Mining Innovation (CEMI). We are thankful to B. Polzer for suggesting that our previous work could be applied to BHEM data and for suggestions and comments...
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Journal Article
Published: 01 October 2006
The Canadian Mineralogist (2006) 44 (5): 1063–1077.
... within a semitabular zone of massive sulfide 5–15 m thick along the contact between the SIC and the underlying footwall Murray granite. Discontinuous lenses of matrix and disseminated sulfide mineralization one to five meters thick occur along the northern flank of the massive sulfide, in contact...
FIGURES | View All (10)
Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0020(02)
EISBN: 9780813756202
...), transgressive (TST), and highstand systems tracts (HST) (Fig. 2 ). These sequences are defined by sequence boundaries associated with the Oriskany Sandstone (The Wallbridge Unconformity; Swezey, 2002 ), within the Selinsgrove (Senaca) Member of the Onondaga Limestone, the base of the Purcell/Cherry Valley...
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