Dinoflagellate biostratigraphy of the Toarcian to Lower Oxfordian (Jurassic) of the Barents Sea region

Smelror, Morten; Below, Raimond

doi:10.1016/b978-0-444-88943-0.50035-6

Cited by 21 publications

(53 citation statements)

References 6 publications

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“…The microfloral assemblages recovered in the impact-affected "Ragnarok formation" (171.08-74.02 m) are comparable to those found in the Wilhelmøya and Storfjorden subgroups on Svalbard and the correlative Realgrunnen Subgroup on the Barents Shelf (Bjaerke 1977, Bjaerke and Dypvik 1977, Smelror and Below 1993, Smelror et al 1998). The investigated samples contain low abundance and low diversity assemblages of acritarchs and prasinophycean algae (i.e.…”

Section: Marine Microflorassupporting

confidence: 58%

“…The Hekkingen Formation on the Barents Shelf is correlative with the Agardhfjellet Formation (late Jurassic age) on Svalbard , Nøttvedt et al 1993) and its marine fossil assemblages closely resemble those described from the Agardhfjellet Formation (Nagy and Basov 1998, Nagy et al 1988, Smelror and Below 1993, Smelror et al 2001b, Wierzbowski and Århus 1990. There are no indications of any significant biotic extinctions associated with the Mjølnir impact (Bremer et al 2001).…”

Section: Fig 1 Location Map Of the South-western Barentsmentioning

confidence: 96%

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Biotic Responses to the Mjølnir Meteorite Impact, Barents Sea: Evidence from a Core Drilled within the Crater

Bremer

Smelror

Nagy

et al. 2004

Cratering in Marine Environments and on Ice

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The Mjølnir meteorite crater in the Barents Sea was formed at the Juassic/Cretaceous (Volgian-Ryazanian) boundary. The meteorite impacted the organic-rich clays assigned to the Hekkingen Formation (Volgian-Ryazanian age) and penetrated into underlying Middle Jurassic to Triassic rocks. Studies of macro-and microfossil assemblages from core 7329/03-U-01 drilled at the edge of the crater's central high have revealed the following: 1) a lower unit consisting of strongly disturbed crater fill deposits with a microfossil content similar to that found in the Wilhelmøya Subgroup (Svalbard) and microfloral assemblage similar to those from the Sassendalen Group (Botneheia Formation) and the Storfjorden and Wilhelmøya subgroups on Svalbard; 2) a series of gravity flow deposits containing a mixture of reworked microfloras and -faunas of Middle Triassic/Middle Jurassic origin, and dinoflagellates of Volgian-Ryazanian age; 3) post-impact sediments of the Hekkingen Formation showing anomalous biotal features. In the lowermost post-impact sediments a conspicuous acme of Leiosphaeridia combined with an influx of abundant juvenile freshwater algae (Botryococcus) occurs. This points to brackish surface water conditions. In the same interval, only a few foraminiferids are found while the bivalve Buchia are frequent. High freshwater supply, stratified water-masses and high influx of released nutrients are considered as main factors acting on the post-impact depositional environment. Open marine conditions were restored in the Early Ryazanian. H. Dypvik et al. (eds.), Cratering in Marine Environments and on Ice

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Section: Marine Microflorassupporting

confidence: 58%

Section: Fig 1 Location Map Of the South-western Barentsmentioning

confidence: 96%

Biotic Responses to the Mjølnir Meteorite Impact, Barents Sea: Evidence from a Core Drilled within the Crater

Bremer

Smelror

Nagy

et al. 2004

Cratering in Marine Environments and on Ice

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“…Large-scale dinoflagellate cyst zonations comprising the entire Jurassic system are available for different continents (e.g. northwest Europe: Woollam & Riding 1983;Riding 1984bRiding , 1987Riding & Thomas 1992;Smelror & Below 1992;Poulsen & Riding 2003; offshore North America: Bujak & Williams 1977;South America: Quattrocchio & Volkheimer 1990;Australia: Helby et al 1987, 2004. In all these zonations, the Aalenian is said to be marked by a relatively low dinoflagellate cyst diversity.…”

Section: Previous Work On Earliest Middle Jurassic Dinoflagellate Cysmentioning

confidence: 99%

Dinoflagellate cyst biostratigraphy of the Opalinuston Formation (Middle Jurassic) in the Aalenian type area in southwest Germany and north Switzerland

Feist-Burkhardt

Pross

2010

LET

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Feist‐Burkhardt, S. & Pross, J. 2010: Dinoflagellate cyst biostratigraphy of the Opalinuston Formation (Middle Jurassic) in the Aalenian type area in southwest Germany and north Switzerland. Lethaia, Vol. 43, pp. 10–31. In order to provide a detailed dinoflagellate cyst stratigraphy of the Lower Aalenian Opalinuston Formation from the Aalenian type area, 68 samples from four boreholes and one outcrop section were analysed. The sample localities are Hausen an der Fils and Wittnau in southwest Germany, Weiach in north Switzerland and Mont Russelin in the Swiss Jura Mountains. Dinoflagellate cyst assemblages were recovered from the Late Toarcian Aalensis Zone to the Late Aalenian Murchisonae Zone. The samples yielded rich, well‐preserved and diverse assemblages with 51 dinoflagellate cyst taxa identified in total. The dinoflagellate cyst distribution data obtained from this study allow a high‐resolution biostratigraphical subdivision of the lowermost Middle Jurassic Opalinuston Formation into four palynostratigraphical units. First and last occurrences, acmes and consistent presence of the species Batiacasphaera sp. A, Evansia cf. granochagrinata, Kallosphaeridium praussii, Nannoceratopsis triangulata, Phallocysta? frommernensis and Wallodinium laganum were selected as the criteria for defining these units. The obtained high‐resolution palynostratigraphical scheme provides a basis for establishing and further refining early Middle Jurassic biostratigraphy in the Boreal and Tethyan realms. □Aalenian, biostratigraphy, dinoflagellate cysts, Germany, Jurassic, Switzerland, Toarcian.

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“…Unsurprisingly, no characteristic boreal taxa such as Phallocysta thomasii and Valvaeodinium aquilonium were observed. The latter taxa are presumably coldwater forms which are part of a characteristic assemblage restricted to northern Europe and the Arctic (Smelror, 1991;Smelror and Below, 1992).…”

Section: Mareta Beachmentioning

confidence: 99%

The Jurassic (Pliensbachian to Kimmeridgian) palynology of the Algarve Basin and the Carrapateira outlier, southern Portugal

Borges

Riding

Fernandes

et al. 2011

Review of Palaeobotany and Palynology

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Dinoflagellate biostratigraphy of the Toarcian to Lower Oxfordian (Jurassic) of the Barents Sea region

Cited by 21 publications

References 6 publications

Biotic Responses to the Mjølnir Meteorite Impact, Barents Sea: Evidence from a Core Drilled within the Crater

Biotic Responses to the Mjølnir Meteorite Impact, Barents Sea: Evidence from a Core Drilled within the Crater

Dinoflagellate cyst biostratigraphy of the Opalinuston Formation (Middle Jurassic) in the Aalenian type area in southwest Germany and north Switzerland

The Jurassic (Pliensbachian to Kimmeridgian) palynology of the Algarve Basin and the Carrapateira outlier, southern Portugal

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