Dinoflagellate cysts of the Jurassic System

Riding, James B.; Thomas, Joanna E.

doi:10.1007/978-94-011-2386-0_2

Cited by 128 publications

(162 citation statements)

References 54 publications

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“…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). Rhynchodiniopsis cladophora is typical also for the Kimmeridgian with only rare records reported of this species above the A. eudoxus Zone (Riding and Thomas 1992).…”

Section: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

“…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). Rhynchodiniopsis cladophora is typical also for the Kimmeridgian with only rare records reported of this species above the A. eudoxus Zone (Riding and Thomas 1992). The spore and pollen associations are typical for the Late Jurassic, but are of little value for precision biostratigraphy.…”

Section: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

“…It has become a biostratigraphic marker for Late Kimmeridgian-Tithonian assemblages (Riley 1980;Bailey et al 1997, Poulsen andRiding 2003). The species' range is reported to extend no further than the Paracraspedites The age of the Tojeira Formation, Jurassic of Montejunto, Portugaloppressus Zone in the Sub-boreal realm (Riding and Thomas 1992); however, in the western Barents Sea, it extends to the Ryazanian (Smelror and Dypvik 2005). The range of D. pannea may consequently differ in the Tethyan realm.…”

Section: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

“…pannea, however, at level 2 suggests a conflicting age of no older than the species' first occurrence in the Sub-boreal A. mutabilis Zone (Riding and Thomas 1992). This age is at least two Tethyan ammonite zones younger than the age given to the Tojeira-1 section by Stam (1986), and given the ammonite biostratigraphy, a younger age at this level is improbable.…”

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: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

Section: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

Section: Dinoflagellate Cysts and Other Palynomorphsmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2017

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“…Scriniodinium pharo has its FAD at the base of the Mid Tithonian Progalbanites 657 albani Zone Riding and Thomas, 1992;Poulsen, 1996). However, the 7, 9), which is broadly consistent with the record in northwest Europe (Fig.…”

mentioning

confidence: 99%