Dinoflagellate cyst stratigraphy of the Kimmeridge Clay (Upper Jurassic) from the Dorset coast, Southern England

Riding, James B.; Thomas, Joanna E.

doi:10.1080/01916122.1988.9989337

Cited by 88 publications

(47 citation statements)

References 22 publications

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“…The first occurrence of D. pannea as a zonal index species is mostly founded on Sub-boreal records. In England, it appears in the Early A. eudoxus Zone in Lincolnshire (Riding 1987) or younger still, the Pectinatites wheatleyensis Zone in Dorset (Riding and Thomas 1988). In the British-Danish sector of the North Sea it is recorded in the Late Kimmeridgian (Poulsen and Riding 2003) and in Poland, Poulsen (1994) notes its first occurrence in the Early Tithonian.…”

Section: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

“…Assemblages from further north in Europe have markedly higher diversities (i.e., Riding and Thomas 1988). This may be due to partial restriction in the Lusitanian basin preventing some mixing of the dinoflagellates with areas outside Portugal.…”

Section: Depositional Environmentmentioning

confidence: 99%

“…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%

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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%

Section: Depositional Environmentmentioning

confidence: 99%

Section: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

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

et al. 2017

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“…Note that the summary logs in Figures 2, 3 and 4 have been redrawn against 'true' depth scale, allowing direct comparison with the type section. Dinocyst stratigraphy after Riding & Thomas (1988), ammonite zones and subzones after Cope (1967Cope ( , 1978 and Cope et al (1980). Bed group numbers after Cox & Gallois (1981), Wignall (1990), and Coe (A. L. Coe, unpub.…”

Section: Description Of the Type Section And The Coeval Beds Of Swanwmentioning

confidence: 99%

Integrated stratigraphy of the Kimmeridge Clay Formation (Upper Jurassic) based on exposures and boreholes in south Dorset, UK

et al. 2001

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For the purposes of a high-resolution multi-disciplinary study of the Upper Jurassic Kimmeridge Clay Formation, two boreholes were drilled at Swanworth Quarry and one at Metherhills, south Dorset, UK. Together, the cores represent the first complete section through the entire formation close to the type section. We present graphic logs that record the stratigraphy of the cores, and outline the complementary geophysical and analytical data sets (gamma ray, magnetic susceptibility, total organic carbon, carbonate, δ13Corg). Of particular note are the new borehole data from the lowermost part of the formation which does not crop out in the type area. Detailed logs are available for download from the Kimmeridge Drilling Project web-site at http://kimmeridge.earth.ox.ac.uk/. Of further interest is a mid-eudoxus Zone positive shift in the δ13Corg record, a feature that is also registered in Tethyan carbonate successions, suggesting that it is a regional event and may therefore be useful for correlation. The lithostratigraphy of the cores has been precisely correlated with the nearby cliff section, which has also been examined and re-described. Magnetic-susceptibility and spectral gamma-ray measurements were made at a regular spacing through the succession, and facilitate core-to-exposure correlation. The strata of the exposure and core have been subdivided into four main mudrock lithological types: (a) medium-dark–dark-grey marl; (b) medium-dark–dark grey–greenish black shale; (c) dark-grey–olive-black laminated shale; (d) greyish-black–brownish-black mudstone. The sections also contain subordinate amounts of siltstone, limestone and dolostone. Comparison of the type section with the cores reveals slight lithological variation and notable thickness differences between the coeval strata. The proximity of the boreholes and different parts of the type section to the Purbeck–Isle of Wight Disturbance is proposed as a likely control on the thickness changes.

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“…Examination of the BGS samples revealed the presence of palynomorphs of Carboniferous, Jurassic, and Cretaceous age ( (Riding & Thomas, 1988. The most stratigraphically restricted form is Crussolia deflandrei, which unequivocally indicates a derivation from the Weymouth Member of the Oxford Clay Formation (formerly Upper Oxford Clay).…”

Section: Derived Palynomorphsmentioning

confidence: 99%

The Pleistocene College Farm Silty Clay at Great Blakenham, Suffolk, England – additional information on the course of the early River Thames

Moorlock

Riding

Hamblin

et al. 2002

Netherlands Journal of Geosciences

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The Pleistocene College Farm Silty Clay Member of the Creeting Formation at Great Blakenham, Suffolk, south-east England is shown to contain indigenous and recycled dinoflagellate cysts and other derived palynomorphs. The indigenous dinoflagellate cysts indicate a marine influence during deposition of the clay, whilst the other palynomorphs demonstrate derivation of sediment from a wide catchment of Carboniferous, Jurassic and Cretaceous bedrocks. It is argued, by comparison with palynological data from the Chillesford Clay Member of the Norwich Crag Formation some 25km to the east, that these sediments were eroded from western, south-central and south-eastern Britain, and transported by the early River Thames to its estuary, where they were redeposited at die western margin of the Crag Basin, during the Early Pleistocene Tiglian TC3 Substage. This interpretation refines earlier research which concluded the College Farm Silty Clay was deposited in a predominantly freshwater environment, such as a lagoon, without any direct access to the sea or major river.

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Dinoflagellate cyst stratigraphy of the Kimmeridge Clay (Upper Jurassic) from the Dorset coast, Southern England

Cited by 88 publications

References 22 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

Integrated stratigraphy of the Kimmeridge Clay Formation (Upper Jurassic) based on exposures and boreholes in south Dorset, UK

The Pleistocene College Farm Silty Clay at Great Blakenham, Suffolk, England – additional information on the course of the early River Thames

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