Introduction

Mascle, J.; Lohmann, G.P.; Clift, P.D.

doi:10.2973/odp.proc.ir.159.101.1996

Cited by 28 publications

(105 citation statements)

References 34 publications

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“…2) penetrated Cretaceous sediments. Five lithologic units were distinguished in this hole (Mascle, Lohmann, Clift, et al, 1996). Only Units V, IV, and most of Unit III belong to the Cretaceous.…”

Section: Biostratigraphy Site 959mentioning

confidence: 95%

“…As in Site 959, this unit is characterized by the dominance of siliciclastic sediments: silty sandstone, siltstone, and clayey siltstone in Subunit VB, quartz sandstone and siltstone in Subunit VA. Unit V is separated from the overlying unit by a sharp boundary, which was inferred to be an unconformity, based on the abrupt change in lithofacies, the inclusions within Unit IV of lithoclasts derived from erosion of the underlying sandstones and claystones, and the abrupt downhole increase in bedding dips (Mascle, Lohmann, Clift, et al, 1996). Unit V was found to be completely devoid of calcareous microfossils and only yielded rare and often poorly preserved palynomorphs.…”

Section: Lithologic Unit Vmentioning

confidence: 99%

“…Comprehensive lithological, petrographical, and sedimentological descriptions of Cretaceous sedimentary sequences recovered from the holes drilled at all of these sites can be found in Mascle, Lohmann, Clift, et al (1996).…”

Section: Locationmentioning

confidence: 99%

“…This unit, which is separated from the underlying Unit V by an unconformity (Mascle, Lohmann, Clift, et al, 1996), was divided into two subunits: (1) Subunit IVB, from 1081.7 to 1062.7 mbsf, composed of bioclastic limestones with some sandy limestone; and (2) Subunit IVA, from 1062.7 to 1043.3 mbsf, which consists of calcareous sandstone and organic-rich claystone, including thin conglomeratic beds with phosphatic pebbles and glauconitic clasts.…”

Section: Lithologic Unit IVmentioning

confidence: 99%

“…Three holes were drilled, of which only two (Holes 960A and 960C; Fig. 3) penetrated Cretaceous sediments (lithologic Units V and IV; Mascle, Lohmann, Clift, et al, 1996).…”

Section: Site 960mentioning

confidence: 99%

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Mesozoic biostratigraphic, paleoenvironmental, and paleobiogeographic synthesis, equatorial Atlantic

Moullade¹,

Watkins²,

Oboh‐Ikuenobe³

et al. 1998

Proceedings of the Ocean Drilling Program, 159 Scientific Results

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Part of the Earth Sciences CommonsThis Article is brought to you for free and open access by the Earth and Atmospheric Sciences, Department of at DigitalCommons@University of Nebraska -Lincoln. It has been accepted for inclusion in Papers in the Earth and Atmospheric Sciences by an authorized administrator of DigitalCommons@University of Nebraska -Lincoln. ABSTRACTCretaceous sediments from Ocean Drilling Program Leg 159 on the Côte d'Ivoire-Ghana Marginal Ridge (CIGMR), eastern equatorial Atlantic, are characterized by distinct stratigraphic changes in sedimentary facies associated with changes in the composition of the clayey and organic fractions, as well as of the calcareous nannofossil, radiolarian, foraminiferal, and palynomorph assemblages. In the absence of reliable magnetostratigraphic information, an integrated biostratigraphy provides the only means used to calibrate the geologic history of the Leg 159 area.The existence of marine depositional environments as early as the late Aptian to early Albian close to the Leg 159 drill sites puts constraints on the timing of the opening of the equatorial Atlantic gateway. Marine sedimentation on the ridge suggests that the West African and South American cratons were largely detached at this segment of the margin by the middle to late Albian. During the Cenomanian to Coniacian the ridge appears to have remained in an elevated position with concurrent low deposition or condensation (Site 959), high carbonate debris accumulation (Site 960), and even erosion (Site 962). Total organic Carbon measurements and microfaunal data lead us to suggest that, following the early opening of the seaway during the Albian, circulation remained restricted in the fragmented sub-basins of the CIGMR. It probably was not until the Santonian that a deep-water connection and circulation system became established between the Central and the South Atlantic. The sedimentary and faunal record at Site 959 show that a rapid subsidence occurred during the Santonian, with sub-calcite compensation depth conditions maintained until and beyond the Cretaceous/Tertiary boundary.

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Section: Biostratigraphy Site 959mentioning

confidence: 95%

Section: Lithologic Unit Vmentioning

confidence: 99%

Section: Locationmentioning

confidence: 99%

Section: Lithologic Unit IVmentioning

confidence: 99%

“…Three holes were drilled, of which only two (Holes 960A and 960C; Fig. 3) penetrated Cretaceous sediments (lithologic Units V and IV; Mascle, Lohmann, Clift, et al, 1996).…”

Section: Site 960mentioning

confidence: 99%

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