Upper Cretaceous dinoflagellate cyst stratigraphy, onshore West Greenland

Nøhr‐Hansen, Henrik

doi:10.34194/bullggu.v170.6730

Cited by 49 publications

(10 citation statements)

References 35 publications

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“…In an interval designated as Maa strichtian based on foraminiferal data, they recognised an early Maastrichtian subzone for a taxon they identified as Impagidinium #LL. This taxon is probably conspecific with the species identified here as Impagidinium victorianum and the species that Nøhr- Hansen (1996) identified from the upper Maastrichtian in the Nuussuaq Basin as Impagidinium sp. cf.…”

Section: Maastrichtiansupporting

confidence: 52%

“…2), Dam et al (1998b) recognised an upper Turonian interval IV and an uppermost Turo -nian to lower Coniacian interval III; interval IV is charac terised by a Heterosphaeridium difficile acme; Hetero sphaeridium difficile and Circulodinium distinctum are common in the upper part of interval III and Raphidodinium fucatum has its acme in the upper part of Interval III. Interval III correlates in part with the early Coniacian Spinidinium echinoideum interval described by Nøhr-Hansen (1996). Bujak Davies Group (1987) recognised a Heterosphaeridium difficile Zone, which they considered to be early Campanian.…”

Section: Turonian-santonianmentioning

confidence: 67%

“…palynology (e.g. Nøhr-Hansen 1996, 1997a-c, 2003Nøhr-Hansen & Dam 1997;Dam et al 1998bDam et al , 2009Sønderholm et al 2003b;Piasecki 2003;Pedersen & Nøhr-Hansen 2014). Other microfossil groups utilised include nannofossils Sheldon 2003) in the Palaeogene-Neogene and foraminifera , plus ostracods, radiolarians and diatoms .…”

Section: Previous Palaeontological Studiesmentioning

confidence: 99%

“…Bujak Davies Group (1987) recognised a Heterosphaeridium difficile Zone, which they considered to be early Campanian. The top of Nøhr- Hansen's (1996) Coniacian -early Santonian Heterosphaeridium difficile interval was defined by the LO of Heterosphaeridium difficile at the top of the early Santonian, citing as justification Costa & Davey (1992). Williams et al (2004) plotted the FO of Hetero sphaeridium difficile at about the early-middle Turonian boundary and its LO in the late Coniacian in northern midlatitudes.…”

Section: Turonian-santonianmentioning

confidence: 99%

“…This reassignment would indicate that the age of the Graham Island sample is Santonian to early Campanian, and that the LO of Spongodinium obscurum is within this time interval. The base of the lower to middle Campanian Aquilla pollenites interval decribed by Nøhr- Hansen (1996) from the Nuussuaq Basin is defined by the FO of Aquillapollenites species. In the Labrador Margin wells, the following dinocyst species have their LOs at the Campanian-Maastrichtian boundary: Odontochitina co stata, Trichodinium castanea and Xenascus ceratioides.…”

Section: Campanianmentioning

confidence: 99%

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Biostratigraphic correlation of the western and eastern margins of the Labrador–Baffin Seaway and implications for the regional geology

2016

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New analyses of the palynological assemblages in 13 offshore wells on the Canadian margin and six on the West Greenland Margin, in conjunction with onshore data, have led to a new biostratigraphic framework for the Cretaceous–Cenozoic strata of the Labrador Sea – Davis Strait – Baffin Bay (Labrador–Baffin Seaway) region and the first broad biostratigraphic correlation of the Canadian and Greenland margins. This framework is based on 167 last occurrences and 18 local/regional peak/common-occurrence events for dinocysts, miospores, fungal spores and Azolla. Detailed biostratigraphic evidence has confirmed the following hiatuses: pre-Aptian in the Hopedale Basin; pre-Albian in the Saglek Basin; Albian–Turonian in some wells of the Hopedale Basin; Turonian–Santonian/Campanian in some areas; pre-Campanian and late Campanian – Thanetian on the Greenland Margin; late Maastrichtian and Danian in some wells of the Hopedale Basin and in the Saglek Basin; Selandian in part of the Hopedale Basin, in all the Saglek Basin wells and in two wells on the West Greenland Margin; late Ypresian and/or Lutetian on both sides; Oligocene to middle Miocene of considerable variability on both margins, with all of the Oligocene and the lower Miocene missing in all the West Greenland Margin wells; and middle to late Miocene on the western side. On the Canadian margin, the hiatuses can be partially matched with the five previously recognised regional unconformities; on the Greenland margin, however, the relationship to the five unconformities is more tenuous. Palynomorph assemblages show that most Aptian to Albian sediments were deposited in generally non-marine to marginal marine settings, interrupted by a short-lived shallow marine episode in the Aptian. A marine transgression started in the Cenomanian–Turonian and led to the most open-marine, oceanic conditions in the Campanian–Lutetian; shallowing probably started in the late Lutetian and continued into the Rupelian, when inner neritic and marginal marine palaeoenvironments predominated. Throughout the rest of the Cenozoic, inner neritic palaeoenvironments alternated with marginal marine conditions on the margins of the Labrador–Baffin Seaway. These observations broadly reflect the tectonic evolution of the seaway, with rift conditions prevailing from Aptian to Danian times, followed by drift through much of the Paleocene and Eocene, and post-drift from Oligocene to the present. Dinocysts indicate that climatic conditions in the Labrador–Baffin Seaway region were relatively temperate in the Cretaceous, but varied dramatically through the Cenozoic. The Danian was a time of increasingly warmer climate, a thermal maximum being reached around the Paleocene–Eocene boundary reflecting the global thermal event at this time. Warm to hot conditions prevailed throughout the Ypresian, but the climate began to cool in the Lutetian, a trend that accelerated through the Priabonian and Rupelian. Throughout the Neogene, temperatures generally declined, culminating in the Quaternary.

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Section: Maastrichtiansupporting

confidence: 52%

Section: Turonian-santonianmentioning

confidence: 67%