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hardground

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Series: GSA Special Papers
Published: 06 March 2020
DOI: 10.1130/2019.2544(06)
EISBN: 9780813795447
... by a hardground that formed during subaerial exposure and that terminates Upper Maastrichtian limestone with planktic foraminiferal assemblages deposited at neritic depth during zone CF3 (ca. 66.500 Ma). Above the hardground, there are beachrocks with early Danian zone P1a(1) assemblages, which indicate...
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Series: GSA Field Guide
Published: 10 December 2018
DOI: 10.1130/2018.0051(13)
EISBN: 9780813756516
...). An intriguing exposure is at Reed Quarry ( Fig. 5 ) where interlayered large-scale grainstone beds and stacked hardground surfaces can be seen. We interpret this locality as representing the shoal crest. Working primarily in the Bedford shoal complex area (Dark Hollow Quarry) and the intershoal area ( Fig. 5...
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Journal Article
Published: 19 April 2018
Journal of Paleontology (2018) 92 (4): 568–576.
...Caroline J. Buttler; Mark A. Wilson Abstract A bryozoan-dominated fauna that inhabited small caves underneath a carbonate hardground is here described from the Corryville Formation (Upper Ordovician, Katian) exposed near Washington, Mason County, Kentucky, USA. The dominant bryozoan, Stigmatella...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP469.17
EISBN: 9781786203885
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Journal Article
Published: 23 December 2015
Journal of the Geological Society (2016) 173 (2): 241–244.
...V. Paul Wright; Lesley Cherns Abstract Ordovician change in the nature of seafloor carbonates saw rapid decline of previously widespread flat pebble conglomerates and the Palaeozoic peak abundance of hardgrounds. The effective disappearance of flat pebble conglomerates, widely attributed...
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Journal Article
Journal: GSA Bulletin
Published: 01 September 2015
GSA Bulletin (2015) 127 (9-10): 1453–1463.
... for phosphatic hardgrounds, which are often found in regions of upwelling, but of which questions remain about the initial formation and subsequent diagenesis. Here, we apply standard isotopes (δ 13 C, δ 18 O) alongside the novel clumped isotope (Δ 47 ) used in this study for the first time to reconstruct...
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Journal Article
Published: 04 August 2015
Journal of the Geological Society (2015) 172 (6): 763–776.
... on seismic data and drill core. Here, field observations provide evidence for recurring margin collapse of a long-lived Campanian channel. Compressionally deformed and thrust chalk hardgrounds are correlated to thicker, non-cemented chalk beds that form a broad, gentle anticline. These chalks represent...
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Journal Article
Journal: PALAIOS
Published: 01 April 2015
PALAIOS (2015) 30 (4): 258–271.
...CAROLYN M. FURLONG; MURRAY K. GINGRAS; JOHN-PAUL ZONNEVELD Abstract The Trypanites ichnofacies is frequently associated with low biotic and trace diversity, and erosional or nondepositional conditions. However, analysis of an extensively exposed, modern, siliciclastic, intertidal hardground...
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Journal Article
Journal: Geology
Published: 01 March 2015
Geology (2015) 43 (3): 235–238.
.... The thickest laminated chert beds are interpreted to represent intervals when seafloor silicification outpaced deposition of hydrothermal muds, forming the equivalent of Phanerozoic hardgrounds at sequence boundaries. * E-mail: B.Rasmussen@curtin.edu.au 16 10 2014 02 01 2015 02 01 2015...
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Journal Article
Published: 27 January 2014
Petroleum Geoscience (2014) 20 (1): 109–123.
... are approximately 1200×1250 m in size, and only faults (no fractures) with offsets greater than 1 m are included. Novel methods have been applied to test the response of flow simulations to the presence or absence of specific geological features, including proxies for hardgrounds, stylolites, patch reefs...
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Journal Article
Published: 27 January 2014
Petroleum Geoscience (2014) 20 (1): 7–26.
... and the spatial distribution of environment of deposition (EOD) belts are important controls on recovery regardless of the production strategy. The presence of cemented hardground surfaces becomes the key control on oil recovery in displacements dominated by vertical flow. Permeability anisotropy is of low...
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Journal Article
Published: 01 March 2013
Journal of the Geological Society (2013) 170 (2): 281–290.
... part of the channel wall and fill is exposed. Within this channel were smaller erosional structures (<10 m deep) that truncate originally horizontal bedding, are floored by hardgrounds, and locally have a basal fill of granular phosphorite. The entire channel system was progressively infilled...
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Journal Article
Journal: GeoArabia
Publisher: Gulf Petrolink
Published: 01 October 2012
GeoArabia (2012) 17 (4): 17–38.
...John H. Powell; Basem K. Moh’d ABSTRACT Hardgrounds and omission surfaces are rare in the predominantly pelagic and hemi-pelagic chalk, chert and phosphorite lithofacies association that forms the Upper Cretaceous (Coniacian to Maastrichtian) Belqa Group succession in central Jordan. However, newly...
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Journal Article
Journal: Geology
Published: 01 December 2011
Geology (2011) 39 (12): 1163–1166.
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Journal Article
Journal: PALAIOS
Published: 01 August 2011
PALAIOS (2011) 26 (8): 470–483.
.... This paleoecologic study examines a carbonate hardground surface encrusted with four species of isorophid edrioasteroids: Curvitriordo stecki , Carneyella ulrichi , Carneyella pilea , and Streptaster vorticellatus . Analysis of edrioasteroid diameters, a proxy for age, shows a bimodal distribution for Curvitriordo...
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Journal Article
Journal: The Leading Edge
Published: 01 February 2011
The Leading Edge (2011) 30 (2): 132–137.
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Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(12)
EISBN: 9780813756240
.... Sequence stratigraphic analysis reveals a series of unconformity-bounded, genetically related facies packages. Shallowing and deepening trends are sometimes difficult to resolve due to a paucity of hydrodynamic indicators, yet unconformity surfaces are well marked by hardgrounds and confirmed by negative C...
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Journal Article
Journal: Geology
Published: 01 October 2010
Geology (2010) 38 (10): e222.
...) dedicate but a single sentence to polygonal fractures in submarine pavements, with a similarly cursory mention of a couple of sentences in Shinn (1969) . Kendall and Skipwith (1969) do not cover polygonal buckling in marine hardgrounds at all. The point being that such fleeting mention is not tantamount...
Journal Article
Published: 01 September 2010
Journal of Paleontology (2010) 84 (5): 783–794.
...Colin D. Sumrall Abstract A large, edrioasteroid-bearing hardground surface from the base of the Bellevue Member of the Grant Lake Formation near Maysville, Mason County, Kentucky is described. Four species are represented including Streptaster vorticellatus (Hall), Carneyella ulrichi Bassler...
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Journal Article
Published: 18 July 2008
Canadian Journal of Earth Sciences (2008) 45 (6): 619–639.
... with encrusting Girvanella, eocrinoid plates, rhynchonelliformean brachiopod valves and subordinate hyoliths and trilobites in tempestite shell beds; these beds underwent synsedimentary cementation on the seafloor to form hardgrounds. In the succeeding, higher energy interval, a complex of metre-scale bioherms...
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