The Cenomanian–Turonian boundary event and dinocyst record at Ganuza (northern Spain)

Lamolda, Marcos A.; Mao, Shaozhi

doi:10.1016/s0031-0182(99)00008-5

Cited by 36 publications

(12 citation statements)

References 21 publications

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“…In Europe, they have a common uppermost Cenomanian to lower Turonian occurrence in Germany (Marshall & Batten 1988;Prauss 2006), Crimea (Dodsworth 2004a), Poland (Dodsworth 2004b) and France (Foucher 1983;Courtinat et al 1991). The taxa have not been recorded in coeval Tethyan sections further south, in Spain (Lamolda & Mao 1999;Peyrot et al 2011Peyrot et al , 2012 and Morocco (Prauss 2012a(Prauss , 2012b. The isolated influx at Lozier Canyon is stratigraphically lower and therefore older than the astronomical age calibration (92.87 Ma; Figure 2) for top frequent C. compactum-membraniphorum in Iona-1.…”

Section: Top Common Cyclonephelium Longispinatummentioning

confidence: 97%

“…In Europe, Senoniasphaera rotundata is an established zonal marker fossil, its base occurring close to the lowerÀmiddle Turonian boundary in France, southern England and Spain (e.g. Foucher 1979Foucher , 1980Foucher , 1981Foucher , 1983Tocher & Jarvis 1987;Lamolda & Mao 1999). Its inception may be later, close to the TuronianÀConiacian boundary farther north in the boreal North Sea region (Costa & Davey 1992).…”

Section: Base Consistent Senoniasphaera Turonicamentioning

confidence: 99%

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Palynostratigraphy and palaeoenvironments of the Eagle Ford Group (Upper Cretaceous) at the Lozier Canyon outcrop reference section, west Texas, USA

Dodsworth¹

2015

Palynology

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This study describes the detailed palynology of the Eagle Ford Group at Lozier Canyon, its principal outcrop reference section in west Texas. Prominent marine phytoplankton assemblages are consistent with a proposed depositional setting for Lozier Canyon on a submarine platform within the Cretaceous Western Interior Seaway (KWIS) of the USA. The Lower Eagle Ford Formation (middle to upper Cenomanian) was deposited under restricted marine conditions with oxygen-deficient, probably anoxic bottom waters, as indicated by the black, organic-rich (ca. 1 to > 6% total organic carbon) shale lithology. The formation comprises two fourth-order stratigraphical sequences, each showing sedimentary evidence of increasing water depth during deposition. Palynomorph assemblages from the sequences are dominated by green algal prasinophyte phycomata in the lower parts and peridinioid dinoflagellate cysts in the upper parts. The productivity of these marine phytoplankton groups may have been stimulated by availability of ammonium (prasinophytes) and nitrite (peridinioids) from upwelling, or vertical expansion of the oxygen-minimum zone. The transition from prasinophyte-to peridinioid-dominated assemblages may reflect elevation of the photic zone to a level less regularly encroached by deeper, ammonium-enriched waters of the denitrification zone. The overlying Upper Eagle Ford Formation (upper Cenomanian to upper Turonian or Coniacian) was deposited under deeper, relatively open marine conditions, as indicated by a decrease in organic carbon content and an increase in carbonate content. This is supported by the presence of diversified dinoflagellate cyst assemblages, including inter-regional (high-to mid-latitude) marker events; in the upper Cenomanian, base and acme Cyclonephelium compactum-membraniphorum, top consistent and frequent Litosphaeridium siphoniphorum, and top Adnatosphaeridium tutulosum; in the middle to upper Turonian, range bases of Heterosphaeridium difficile and Senoniasphaera rotundata. The stratigraphical resolution offered by palynology indicates potential application to wellsite 'geosteering' of commercial shale oil and shale gas wells drilled in the Eagle Ford Group.

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Section: Top Common Cyclonephelium Longispinatummentioning

confidence: 97%

Section: Base Consistent Senoniasphaera Turonicamentioning

confidence: 99%

Palynostratigraphy and palaeoenvironments of the Eagle Ford Group (Upper Cretaceous) at the Lozier Canyon outcrop reference section, west Texas, USA

Dodsworth¹

2015

Palynology

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“…Microfossil data of the CAD have been discussed in more general work (Ramírez del Pozo 1972), whereas preliminary research on foraminifers include the work of Cherchi & Schroeder (1982) and Méndez & Swain (1983) on ostracods. Lamolda et al (2001) studied the dinocysts of the Arobes section, which they correlate with the Upper Cenomanian of the Ganuza section (Navarra Province, northern Spain), previously studied by Lamolda & Mao (1999). The dinocysts characterize an open continental shelf.…”

Section: Geological Settingmentioning

confidence: 97%

Cretaceous Oceanic Anoxic Event 2 in the Arobes section, northern Spain: nannofossil fluctuations and isotope events

Bernárdez

Kaiho

Lamolda

2013

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The Cenomanian-Turonian boundary interval of the Arobes section, northern Spain, represents the maximum depth of a relatively shallow succession. The investigated section extends within the Rotalipora cushmani and Whiteinella archaeocretacea planktonic foraminiferal zones, and from UC3 up to UC8 nannofloral zones, respectively. The Oceanic Anoxic Event 2 (OAE2) is about 16 m thick and includes a positive d 13 C excursion, from 3 up to 5.5‰. The first peak of d 13 C is situated towards the upper part of the Rotalipora cushmani planktonic foraminiferal zone, while the second peak of d 13 C is situated in the lower part of the Whiteinella archaeocretacea planktonic foraminiferal zone. The plateau, the youngest phase of OAE2, ends slightly above the first occurrence (FO) of the nannofossil Quadrum gartneri. Based on nannofloral fluctuation, an unstable environment is recognized from the last occurrence (LO) of the nannofossil Axopodorhabdus albianus up to the FO of the nannofossil Quadrum gartneri. Mesotrophic, eutrophic and oligotrophic nannofossils have successive peaks throughout the OAE2. In the lower part of OAE2, especially in the trough phase and second build-up, productivity increased. The calcareous dinoflagellate Thoracosphaera spp. peaks up to almost 30% in the lower part of the second build-up phase. The critical nannofloral turnover episode is characterized by impoverished calcareous nannofossil assemblages and temporary disappearances of high-fertility taxa, such as Biscutum constans and Zeugrhabdotus erectus. This shift in nannofloral assemblages starts in the last stages of OAE2; that is, towards the top of the second build-up phase and also covers the main part of the plateau phase of d 13 C.

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“…12) are present in beds 4-8 (Table 1). E. spinosa has a consistent Middle Cenomanian range top in northwest Europe (Foucher, 1981;Costa and Davey, 1992;Tocher and Jarvis, 1994) though it ranges into the Turonian in the Vocontian Trough, southeast France (Courtinat et al, 1991), in northern Spain (Lamolda and Mao, 1999), Bulgaria (Pavlishina and Minev, 1998) and North America (Haq et al, 1988;Li and Habib, 1996). P. spinocristatum has not previously been recorded from deposits younger than Albian (e.g.…”

Section: Biostratigraphymentioning

confidence: 99%

The Palynology of the Cenomanian-Turonian (Cretaceous) Boundary Succession at Aksudere in Crimea, Ukraine

Dodsworth¹

2004

Palynology

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The Cenomanian–Turonian boundary event and dinocyst record at Ganuza (northern Spain)

Cited by 36 publications

References 21 publications

Palynostratigraphy and palaeoenvironments of the Eagle Ford Group (Upper Cretaceous) at the Lozier Canyon outcrop reference section, west Texas, USA

Palynostratigraphy and palaeoenvironments of the Eagle Ford Group (Upper Cretaceous) at the Lozier Canyon outcrop reference section, west Texas, USA

Cretaceous Oceanic Anoxic Event 2 in the Arobes section, northern Spain: nannofossil fluctuations and isotope events

The Palynology of the Cenomanian-Turonian (Cretaceous) Boundary Succession at Aksudere in Crimea, Ukraine

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