Aptian to Cenomanian Dinoflagellate Cysts from the Mazagan Plateau, Northwest Africa (Sites 545 and 547, Deep Sea Drilling Project Leg 79)

Below, Raimond

doi:10.2973/dsdp.proc.79.123.1984

Cited by 32 publications

(57 citation statements)

References 11 publications

(11 reference statements)

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“…Existing zonations could not be recognized here. Therefore, age assignments were based on first occurrences of selected species, whose ranges are known from the North Atlantic Ocean, from northwest Europe, and from the Mazagan Plateau, off the northwest African shore, DSDP Leg 79 (Below, 1984).…”

Section: Resultsmentioning

confidence: 99%

Albian-Cenomanian Dinoflagellate Cysts from Sites 627 and 635, Leg 101, Bahamas

Masure¹

1988

Proceedings of the Ocean Drilling Program

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The Albian-Cenomanian sediments in Holes 627B and 635B contain diverse dinoflagellate-cyst assemblages, which show affinities with coeval assemblages from offshore Morocco and northwest Europe. A total of 34 samples were ana lyzed from the shallow-water platform sediments and neritic marly chalk of Hole 627B and from the argillaceous chalk and limestone of Hole 635B. Dinoflagellate cysts indicate that the top of the shallow-water platform drilled at Hole 627B must be attributed to the late Albian. Dinocysts also date the drowning of the carbonate platform of the Blake Plateau. This drowning started in the latest Albian (Vraconian) and continued into the Cenomanian. The site area changed from an inner to intermediate or outer(?) neritic environment. The area around Hole 635B from the late Al bian appears to have been situated in a deeper environment than the area around Hole 627B during the same period. The new dinoflagellate-cyst species Compositosphaeridiuml bahamaensis n. sp., Maghrebinia breviornata n. sp., and Subtilisphaeral habibi n. sp. are described, and Pervosphaeridium truncatum is emended. Additional taxonomic re marks about other species are included.

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Section: Resultsmentioning

confidence: 99%

Albian-Cenomanian Dinoflagellate Cysts from Sites 627 and 635, Leg 101, Bahamas

Masure¹

1988

Proceedings of the Ocean Drilling Program

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“…This species was originally described from the Aptian of West Africa (Jain and Millepied, 1973), and has since been reported from the Aptian-Albian through the Cenomanian of the eastern marginal basins of Brazil (Arai et al, 1994(Arai et al, , 2000, including the upper Cenomanian of the Potiguar Basin (Arai et al, 2000). It has also been reported from the Hauterivian through Barremian of Libya (Thusu et al, 1988), Hauterivian through lower Cenomanian of Morocco (Below, 1981), and lower Cenomanian of northwestern Africa (Below, 1984). Subtilisphaera senegalensis has been recorded in Egypt from the Berriasian-Barremian , and the Aptian and Albian (Omran et al, 1990;Schrank and Ibrahim, 1995;Abdel-Kireem et al, 1996; through possibly the lower Cenomanian (Omran et al, 1990) and lower or middle Cenomanian (Ibrahim, 2002).…”

Section: Age Assessmentmentioning

confidence: 85%

Palynology of the Mid-Cretaceous Malha and Galala Formations, Gebel El Minshera, North Sinai, Egypt

Beialy¹,

Head²,

Atfy³

2010

PALAIOS

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Palynological investigations of the mid-Cretaceous, delta-influenced Malha Formation and superjacent transgressive Galala Formation exposed at Gebel El Minshera, north Sinai, Egypt, have yielded a sparse but biostratigraphically useful record of spores, pollen, and rare dinoflagellate cysts. A representative of the pollen genus Tricolporites, recovered 18 m above the base of the Malha Formation, is post-Aptian in age. An interval comprising the upper Malha Formation and lower Galala Formation is dated as middle Albian/middle Cenomanian based on the occurrence of Elaterosporites klaszii at the base and Afropollis jardinus at the top. A palynoflora from the upper Malha Formation, which includes ephedroids as well as Elaterosporites, has affinities with the Albian-Cenomanian Elaterates Province. The presence of palynomorphs associated with active fluvio-deltaic settings supports a proximal deltaic environment for the deposition of the Malha Formation, with the superjacent Galala Formation representing a subsequent marine flooding of the delta. A distinctive monospecific assemblage of the dinoflagellate cyst Subtilisphaera senegalensis in the upper part (Cenomanian) of the Galala Formation reflects an ecologically stressed, marginal-marine environment. This assemblage constitutes the first record of the mid-Cretaceous Subtilisphaera ecozone in Egypt and indeed east of Morocco, and in deposits as young as Cenomanian. The Malha and lowermost Galala Formations are characterized by type III-VI kerogen, which is gas prone but having little potential to produce hydrocarbons. Spore-pollen color indicates thermal maturity at the transitional to over-mature level, which is anomalously high when compared with equivalent deposits in the region.

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“…These marker taxa include Apteodinium maculatum subsp. grande, Carpodinium obliquicostatum, Cauveridinium membraniphorum, Endoceratium dettmannae, Epelidosphaeridia spinosa, Leberidocysta chlamydata, Litosphaeridium siphoniphorum, Ovoidinium scabrosum, Ovoidinium verrucosum and Xiphophoridium alatum (for example Verdier 1974, Foucher 1981, Below 1984, Heilmann-Clausen 1987, Masure 1988, Costa & Davey 1992, Tocher & Jarvis 1996. The microtome sections of Endoceratium dettmannae and Scriniodinium campanula (see Cookson & Hughes 1964, pl.…”

Section: Alcheringamentioning

confidence: 99%