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palynofloral crisis

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Series: Geological Society, London, Special Publications
Published: 01 January 2010
DOI: 10.1144/SP334.11
EISBN: 9781862395824
... of a decrease in the number of pollen species. This is the second most severe loss in pollen species after the Permian–Triassic biotic crisis. In comparison to the marked palynofloral turnover at the Permian–Triassic transition and the end-Carnian decrease in palynofloral diversity, the end-Triassic biotic...
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Journal Article
Published: 01 September 2015
Geological Magazine (2016) 153 (2): 223-251.
...SOFIE LINDSTRÖM Abstract A review of the palynofloral succession at the well-documented Triassic–Jurassic boundary sites – Kuhjoch (Austria), St Audrie's Bay (UK), Stenlille (Denmark), Astartekløft (Greenland), Sverdrup Basin (Arctic Canada), Northern Carnarvon Basin (Western Australia), Southeast...
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Series: GSA Special Papers
Published: 01 September 2014
DOI: 10.1130/2014.2505(13)
... above the palynofloral extinction level, appearance of new forms commenced Jurassic palynofloral recovery. Tetrapod evolution events in the end-Triassic–earliest Jurassic were related to the extinction of the Pseudosuchia, Dicynodontia, Capitosauroidea, Plagiosaroidea, and Rhynchosauria, while...
Journal Article
Published: 12 September 2011
Geological Magazine (2012) 149 (2): 308-332.
... reports from Europe and the Tethyan domain (Kürschner & Herngreen, 2010 ; Cirilli, 2010 ) show that palynofloral composition between the Late Triassic and Hettangian was gradual and without abrupt changes and consequently claimed that the end-Triassic biotic crisis appears to have little affected...
Journal Article
Journal: Geology
Published: 01 November 2004
Geology (2004) 32 (11): 973-976.
... and thus may have had a causal relationship with the climatic crisis and biotic turnover demarcating the boundary. By contrast, previous studies of the Tr-J Newark and Fundy basins of eastern North America indicate that onset of Central Atlantic magmatic province volcanism postdates the Tr-J boundary...
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Series: Geological Society, London, Special Publications
Published: 01 January 2013
DOI: 10.1144/SP376.7
EISBN: 9781862396449
... causal links between possible scenarios for the end-Permian ecological crisis and associated rapid and severe climate change. A precise dating of climatic events, such as the Upper Rotliegend–Zechstein wet phase ( Roscher & Schneider 2006 ; Schneider et al. 2006 ) or the strong increase...
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Journal Article
Journal: Palynology
Published: 01 January 2004
Palynology (2004) 28 (1): 75-119.
..., re-colonised the land in the Early Triassic. Lower Triassic assemblages in which reworking occurred but has not been recognised may give the impression of palynofloral diversity, whereas low diversity and low abundance would be more consistent with the hostile arid environment of the Lower Triassic...
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Series: GSA Special Papers
Published: 01 January 1990
DOI: 10.1130/SPE247-p433
...) and is characterized by the disappearance of most of the Upper Cretaceous dicotyledonous angiosperm taxa. It coincides with a peak in palynofloral extinctions and iridium content and with the occurrence of shocked mineral grains, all of which have become accepted as the characteristic signature of the K/T boundary...
Journal Article
Published: 01 September 2010
Journal of the Geological Society (2010) 167 (5): 877-888.
...Nina R. Bonis; Micha Ruhl; Wolfram M. Kürschner Abstract: A high-resolution palynological study of the Triassic–Jurassic boundary in the St. Audrie's Bay section revealed a palynofloral transition interval with four pronounced spore peaks in the Lilstock Formation. Regular cyclic increases...
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Journal Article
Journal: GSA Bulletin
Published: 01 September 2008
GSA Bulletin (2008) 120 (9-10): 1305-1325.
... integrated with the ammonoid and meager conodont data, is similar to that determined from successions in the Sverdrup Basin (Canada). The Permian-Triassic boundary post-dates a pronounced palynofloral turnover and predates a short duration reverse magnetozone (LT1n.1r). In the correlated Shangsi section...
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Series: Geological Society, London, Special Publications
Published: 01 January 2010
DOI: 10.1144/SP334.12
EISBN: 9781862395824
... assemblages with well-defined and recognizable suites of palynomorphs that enhance the importance of palynomorphs in the definition of Triassic–Jurassic stages. Comparison of the palynomorph assemblages from different biostratigraphical stages demonstrates that a change occurred in the palynofloral...
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Journal Article
Published: 01 July 2003
Journal of the Geological Society (2003) 160 (4): 545-554.
... with independent data from the Vendian palynology of Australia that the Acraman impact induced a biotic crisis. A National Oceanographic and Atmospheric Administration (NOAA) satellite thermal IR image ( Fig. 3 ) of Acraman shows the features at 30 and 85–90 km diameter and arcuate features at c . 150 km...
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Journal Article
Published: 01 January 2013
Journal of the Geological Society (2013) 170 (1): 37-46.
... of Astartekløft and a marine Tr–J boundary section at St Audrie’s Bay, UK, provides no support for the idea that extinction and diversity loss in terrestrial ecosystems preceded biotic change in marine ecosystems at the Tr–J. Instead, the available data support suggestions that the onset of the Tr–J biotic crisis...
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Journal Article
Published: 01 January 2008
Journal of the Geological Society (2008) 165 (1): 319-332.
... of body-size changes recorded in the shelly fossil record closely matches that of the trace fossil record. Shell thickness trends do not support a biocalcification crisis during the Late Triassic biotic event. Graphic logs of the boundary sections were produced from detailed field studies by the lead...
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Journal Article
Published: 07 October 2015
Canadian Journal of Earth Sciences (2015) 52 (12): 1150-1168.
... with another increase in ice volume on Gondwana followed by a recrudescence of fault activity and basin subsidence. A prolonged time of aridity, floral crisis, non-deposition, deep weathering and karstification in late Serpukhovian to early Bashkirian times is contemporaneous with abundant glacial deposits...
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Journal Article
Published: 06 February 2008
Canadian Journal of Earth Sciences (2008) 45 (1): 45-67.
... Group, Nova Scotia. The Pendleian–Arnsbergian coal-bearing strata high in the undivided Barachois Group predate the post-Arnsbergian major floral crisis and, with their correlatives, represent the youngest known rock units of Mississippian age in Atlantic Canada. They are significantly older than...
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Journal Article
Published: 01 April 1997
Journal of the Geological Society (1997) 154 (2): 265-292.
...-pods, molluscs, echinoderms, fish, amphibians, reptiles and terrestrial plants (macrofossils and palynomorphs). These reviews take account of possible biasing factors in the fossil record in order to extract the most comprehensive picture of the K-T biotic crisis available. Results suggest that many...
Journal Article
Published: 29 June 2017
Journal of the Geological Society (2017) 174 (6): 1019-1030.
... ). Stratigraphically abrupt composition changes were recorded in the Boltysh palynofloral data, particularly at boundaries between the MAOs ( Jolley et al. 2015 ). Given the time constraints outlined above, these compositional shifts are interpreted as responses to c . 21 kyr orbital precession forcing, showing...
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Series: Geological Society, London, Special Publications
Published: 01 January 2010
DOI: 10.1144/SP329.3
EISBN: 9781862395770
... Plate, the drowning of the northeastern margin and local volcanic activity took place. The northern and western parts of the plate were exposed and a wide shallow-marine carbonate shelf surrounded the exposed shield. During the Carnian salinity crisis, large amounts of lowstand evaporites accumulated...
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Journal Article
Published: 01 November 2012
Journal of the Geological Society (2012) 169 (6): 703-711.
... −2400 and −900 m and shows a clear fractionation trend with decreasing MgO and increasing TiO 2 with stratigraphic height. Fig. 2. Stratigraphical distribution of lava geochemistry, palynofloral and interbed geochemistry data for the Faroe Islands Basalt Group lava pile. A clear inverse...
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