The Oxfordian-Kimmeridgian stage boundary (Upper Jurassic): Dinoflagellate cyst assemblages from the Harome Borehole, North Yorkshire, England

Thomas, Joanna E.; Cox, B.M.

doi:10.1016/0034-6667(88)90063-2

Cited by 32 publications

(22 citation statements)

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“…This species has a base in the Oxfordian in the Sub-boreal realm. Occurrences of this species in England range from the Late Oxfordian (Thomas and Cox 1988) to the Aulacostephanus mutabilis/Aulacostephanus eudoxus zonal boundary (Riding and Thomas 1988). The Tojeira-1 section is no younger than Kimmeridgian, given the range tops of G. jurassica jurassica and E. luridum which coincide in the Aulacostephanus autissiodorensis Zone (Riding and Thomas 1992;Bailey et al 1997;Poulsen and Riding 2003).…”

Section: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal

et al. 2017

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Precise biostratigraphic dating of the Tojeira Formation (Late Jurassic, Early Kimmeridgian) of the Montejunto section of west-central Portugal, which has yielded important planktonic foraminiferal assemblages, is hindered by poor preservation in the upper part of the section as the lithology shifts from shale to coarser clastics. Assignment was previously made to the Idoceras planula and Sutneria platynota zones based on ammonites. Coccolith and dinoflagellate assemblages described here concur with the Early Kimmeridgian, yet, a finer age constraint is proposed by cyclo-and chemostratigraphical correlation. Peaks in d 13 C org and TOC, if equivalent to maxima in the envelope of clay/carbonate cycles in SE France, imply that the c. 50 m-thick section spans a 0.8-myr interval of the S. platynota through upper Ataxioceras hypselocyclum ammonite zones, with the approximate base of the A. hypselocyclum Zone at c. 15.4 m (level 13). Such stratigraphy provides new insights into the upper part of the formation by interbasinal correlation with other Tethyan records. An extended first occurrence of the dinoflagellate species Dichadogonyaulax? pannea in the S. platynota Zone is also proposed.

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Section: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal

et al. 2017

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“…3. Fig 4, DGU- to mid Kimmeridgian (Serratum to Mutabilis Zones) of England (N~hr-Hansen, 1986;Thomas and Cox, 1988).…”

Section: Epiplosphaera Areolatamentioning

confidence: 99%

“…Sarjeant (1979) reported the range of this species as Early Bajocian to mid Callovian. Thomas &Cox (1988) recorded this species in the Late Oxfordian to Early Kimmeridgian (Serratum -Bayley Zones) in England.…”

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confidence: 98%

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The dinoflagellate cyst genus <i>Epiplosphaera</i> Klement 1960 - a reappraisal

Poulsen

1992

J. Micropalaeontol.

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The dinoflagellate cyst genus Epiplosphaera Klement 1960 and its species have been studied in material from the Oxfordian and Kimmeridgian of Poland. The taxonomic history of the genus is summarized and the morphology is discussed. The type species Epiplosphaera bireticulata differs from other representatives of the genus in having high septa which are dissected distally. Additional septa in E . bireticulata form a second reticulum inside the parasutural septa. Epiplosphaera reticulata differs from the other species by having low spines and low, smooth septa. The septa form a second reticulum within the parasutures, as in the case with E. bireticulata. Epiplosphaera areolata has high spines, but almost no reticulum or parasutures. Epiplosphaera reticulospinosa is intermediate between E. bireticulata and E . areolata. It has a mixture of both high and low septa between thespines. Epiplosphaeragochtii has low spinesand few,low septa betweensomeof the spines.Epiplosphaera ornata is regarded as a junior synonym of E. gochtii. -1.

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“…The nearest substantial upland areas were over 100 km to the west on the Scottish landmass (Bradshaw et al, 1992). M A N U S C R I P T et al, 1993) as with onshore sections of the Kimmeridge Clay (Riding and Thomas, 1988;Thomas, 1988). More detailed studies of Upper Jurassic palynomorphs have been conducted elsewhere in the North Sea rift system, e.g.…”

Section: Accepted Manuscriptmentioning

confidence: 97%

Palaeoecology of syn-rift topography: A Late Jurassic footwall island on the Josephine Ridge, Central Graben, North Sea

McArthur

Jolley

Hartley

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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Understanding rift topography is essential for determining source areas, sediment pathways, and the type of sediment delivered to a rift basin; factors essential for interpreting petroleum systems in ancient rifts. Here we investigate Upper Jurassic sediments from the Josephine Ridge region of the Central Graben, North Sea, by integrating geophysical, palynological, petrophysical and sedimentological datasets to analyse the palaeoenvironments of the Jade and Judy horsts, the tops of which are not preserved.Interpretation of geophysical and petrophysical data together with core descriptions show study wells to step progressively away from the Josephine Ridge into adjacent grabens. One hundred and five palynological samples from six wells range from the Oxfordian to the Lower Tithonian, spanning the syn-rift period of the Central Graben. Samples from the adjacent grabens and the Jade Horst are rich in dinoflagellate cysts and possess <20% terrestrial palynomorphs. Samples from the Judy Horst contain a wide range of terrestrial palynomorphs, dominated by lycopsid, fern and moss spores, representing c.50% of the recovered palynomorphs. Correspondence analysis of the assemblages imply Jade did not possess a terrestrial ecosystem; Judy samples define seven groupings of related miospores, A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 all interpreted to represent very low lying, relatively early successional type environments.This implies subaerial exposure of the Judy Horst during the Late Jurassic, which is interpreted to have formed an isolated, low relief, footwall crest island. This study provides a new methodology for investigating rift topography, particularly in cases where the tops of horsts were subsequently removed by erosion. The Judy Island would have separated the Central Graben into its eastern and western arms earlier than previously predicted, in the Late Oxfordian, with consequences for distribution of shallow and deep-marine reservoir quality sediments.

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The Oxfordian-Kimmeridgian stage boundary (Upper Jurassic): Dinoflagellate cyst assemblages from the Harome Borehole, North Yorkshire, England

Cited by 32 publications

References 2 publications

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal

The dinoflagellate cyst genus <i>Epiplosphaera</i> Klement 1960 - a reappraisal

Palaeoecology of syn-rift topography: A Late Jurassic footwall island on the Josephine Ridge, Central Graben, North Sea

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The Oxfordian-Kimmeridgian stage boundary (Upper Jurassic): Dinoflagellate cyst assemblages from the Harome Borehole, North Yorkshire, England

Cited by 32 publications

References 2 publications

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal

The dinoflagellate cyst genus &lt;i&gt;Epiplosphaera&lt;/i&gt; Klement 1960 - a reappraisal

Palaeoecology of syn-rift topography: A Late Jurassic footwall island on the Josephine Ridge, Central Graben, North Sea

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The dinoflagellate cyst genus <i>Epiplosphaera</i> Klement 1960 - a reappraisal