Mike Bidgood

NHS Grampian

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Michael D. Simmons

Halliburton (United Kingdom)

Jason Jeremiah

GGG (France)

Jonathan Redfern

University of Manchester

Luc G. Bulot

Centre National de la Recherche Scientifique

Kyle Reuber

Geophysical Survey

Frédéric De Ville De Goyet

University of Liège

Daniela Reháková

Comenius University Bratislava

Max Casson

University of Manchester

Gérôme Calvès

Université Toulouse III - Paul Sabatier

Aİ

Aral İ. Okay

Istanbul Technical University

Cooperative Institutions

University of Manchester

Centre National de la Recherche Scientifique

Halliburton (United Kingdom)

Natural History Museum

University of Aberdeen

Institut de Recherche pour le Développement

Shell (Netherlands)

Montanuniversität Leoben

Memorial University of Newfoundland

Universiti Brunei Darussalam

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Table T1) Turbidite bed numbers and ages of ODP Leg 180 sites

Sherif Abdel Monem Awadallah Richard N. Hiscott Mike Bidgood Timothy E Crowther

Table (database)

10.1594/pangaea.787011

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Citations (0)

The West Crocker formation of northwest Borneo: A Paleogene accretionary prism

Geological Society of America eBooks (2008)

Joseph J. Lambiase Tan Yaw Tzong Amelia G. William Mike Bidgood Patrice Brénac

An integrated structural, stratigraphic, and sedimentological analysis of the West Crocker formation in northwest Borneo suggests that it is best interpreted as an accretionary prism. The structural geology provides clear evidence of at least two episodes of syndepositional folding and thrust faulting. A probable Eocene age, indicated by foraminiferal and palynological assemblages, differs from the generally accepted Oligocene to early Miocene age and is consistent with deposition of the West Crocker formation during a phase of tectonism at the northwest Borneo margin. Sandstones within the West Crocker formation were deposited by high-density turbidity currents that constructed relatively small, progradational lobes in a slope apron environment, and trace fossil assemblages confirm bathyal water depths of ∼1000 m or more. The composition of the sandstones, which contain abundant feldspars and lithic fragments, suggests that their provenance was the first-cycle product of an eroded orogenic belt, whereas immature textures indicate a short distance of transport.

Accretionary wedge

Paleogene

10.1130/2008.2436(08)

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Citations (24)

Cenomanian planktonic foraminifera, bioevents and biozonation – A brief review

Newsletters on Stratigraphy (2022)

Mike Bidgood Michael D. Simmons

Cenomanian

10.1127/nos/2022/0717

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Citations (8)

Evaluating the segmented post-rift stratigraphic architecture of the Guyanas continental margin

Petroleum Geoscience (2021)

Max Casson Jason Jeremiah Gérôme Calvès Frédéric De Ville De Goyet Kyle Reuber

Segmentation of the Guyanas continental margin of South America is inherited from the dual-phase Mesozoic rifting history controlling the first-order post-rift sedimentary architecture. The margin is divided into two segments by a transform marginal plateau (TMP), the Demerara Rise, into the Central and Equatorial Atlantic domains. This paper investigates the heterogeneities in the post-rift sedimentary systems at a mega-regional scale (>1000 km). Re-sampling seven key exploration wells and scientific boreholes provides new data (189 analysed samples) that have been used to build a high-resolution stratigraphic framework using multiple biostratigraphic techniques integrated with organic geochemistry to refine the timing of 10 key stratigraphic surfaces and three megasequences. The results have been used to calibrate the interpretation of a margin-scale two-dimensional seismic reflection dataset, and to build megasequence isochore maps, structural restorations and gross depositional environment maps at key time intervals of the margin evolution. Our findings revise the dating of the basal succession drilled by the A2-1 well, indicating that the oldest post-rift sequence penetrated along the margin is late Tithonian age (previously Callovian). Early Central Atlantic carbonate platform sediments passively infilled subcircular-shaped basement topography controlled by the underlying basement structure of thinned continental crust. Barremian–Aptian rifting in the Equatorial Atlantic, caused folding and thrusting of the Demerara Rise, resulting in major uplift, gravitational margin collapse, transpressional structures and peneplanation of up to 1 km of sediment capped by the regional angular Base Albian Unconformity. Equatorial Atlantic rifting led to margin segmentation and the formation of the TMP, where two major unconformities developed during the intra Late Albian and base Cenomanian. These two unconformities are time synchronous with oceanic crust accretion offshore French Guiana and in the Demerara–Guinea transform, respectively. A marine connection between the Central and Equatorial Atlantic is demonstrated by middle Late Albian times, coinciding with deposition of the organic-rich source rock of the Canje Formation (average total organic carbon 4.21%). The succession is variably truncated by the Middle Campanian Unconformity. Refining the stratigraphic framework within the context of the structural evolution and segmentation of the Guyanas margin impacts the understanding of key petroleum system elements. Supplementary material : Photographs of sandstone petrography thin sections (Fig. S1); calcareous nannofossil plates (Fig. S2); palynology reports for A2-1 and FG2-1 (Fig. S3); taxonomy description of new species; sample table and organic geochemistry results (Table S1); and nannofossil distribution charts (Table S2) are available at https://doi.org/10.6084/m9.figshare.c.5280490

Basement

Continental Margin

Passive margin

10.1144/petgeo2020-099

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Citations (19)

Evaluating the segmented post-rift stratigraphic architecture of the Guyanas continental margin

Figshare (2021)

Max Casson Jason Jeremiah Gérôme Calvès Frédéric De Ville De Goyet Kyle Reuber

Table S2

Continental Margin

Margin (machine learning)

Passive margin

10.6084/m9.figshare.13637770

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Biostratigraphy and paleoenvironments of the Oligocene succession(İhsaniye Formation) at Karaburun (NW Turkey)

TURKISH JOURNAL OF EARTH SCIENCES (2019)

Michael D. Simmons Mike Bidgood Paul G. CONNELL Stjepan Ćorić Aral İ. Okay

The biostratigraphy and paleoenvironments of the İhsaniye Formation exposed at Karaburun in northwest Turkey is described based upon the study of abundant and well-preserved foraminifera, calcareous nannofossils and palynomorphs. The studied succession is Early Oligocene in age, with calcareous nannofossil zones upper NP21 (Subzone CNO1) to lower NP23 (Subzone CNO3) and planktonic foraminifera zones O1 (~P18) and O2 (~P19) represented, and palynological assemblages suggestive of zones D13 to D14a. Based on these new data, a revised interpretation of the stratigraphic succession is presented. Deposition was controlled by a now inverted normal fault, with deposition of older stratigraphy (upper NP21 to NP22) restricted to the original hanging wall. During NP23, deposition commenced on the footwall, resulting in progressive onlap of an exposed Eocene reefal limestone (Soğucak Formation). Three primary sedimentary facies are present: marls with thin calcareous siltstones, marls with synsedimentary slumps and debris flows, and coarse pebbly sandstones. The coarse pebbly sandstones were deposited in a fan-delta/shoreface paleoenvironment and represent the initial phase of onlap during biozone NP23 onto a rocky shoreline on the footwall side of the fault. The marl-dominated facies represent deposition in outer shelf?upper bathyal environments. The succession demonstrates evidence for a near-end Eocene relative sea-level fall. Changes in the abundance of planktonic foraminifera and the onlap onto the footwall demonstrate maximum subsequent transgression within NP23. This reflects eustasy rather than Paratethyan relative sea-level. No interpretation of sea-water salinity reduction can be made for the sediments deposited during biozone NP23 in the studied sections, although this is noted in coeval sediments in parts of Paratethys (the "Solenovian Event"). Together with the open marine nature of the diverse and abundant fossil assemblages, it is suggested that deposition of the Karaburun section was strongly influenced by a connection to the global ocean, via the Çatalca Gap, as suggested in a recent study.

Onlap

Marl

Biozone

Marine transgression

Paleogene

10.3906/yer-1907-7

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Citations (4)

Towards a stable and agreed nomenclature for North Sea Tertiary diatom floras — the ‘ Coscinodiscus ’ problem

Geological Society London Special Publications (1999)

Mike Bidgood Alexander G. Mitlehner Gareth D. Jones D. Jutson

Abstract Diatoms are one of the most useful microfossil groups to be found in Tertiary (particularly Palaeogene) sequences of the North Sea subsurface for their biostratigraphic utility, especially where other mineralized-walled microfossil groups (e.g. foraminifera, calcareous nannoplankton, etc.) are absent. An example from one offshore borehole (Shell UK; 29/25-1) is given. However, their further use in biostratigraphic and sequence correlation is hampered by the lack of any stable nomenclature applied to their taxonomy. The numbers of so-called ‘in-house’ taxa are legion with duplication of forms almost inevitable. Few of these many and varied taxa are directly comparable between these schemes, and this leads to almost inevitable confusion for exploration, production and development geoscientists trying to correlate between the various schemes. One stratigraphically important and familiar diatom taxon ( Coscinodiscus sp. 1) is formally described in this paper as Fenestrella antiqua (Grunow) Swatman. In the example shown here it is demonstrated that four forms, previously identified as four independent taxa in open nomenclature (with distinctive stratigraphic ranges), are in fact separate manifestations of the life habitat of this one single species. It is hoped that through an awareness of the biological complexity of these forms, and their relationships to morphology, a stable taxonomy will eventually arise. It is furthermore hoped that this will lead to a stimulus in the study of the biostratigraphic and palaeoenvironmental applications of this important microfossil group to exploration, production and development geoscience.

10.1144/gsl.sp.1999.152.01.08

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Citations (17)

Evaluating the segmented post-rift stratigraphic architecture of the Guyanas continental margin

Figshare (2021)

Max Casson Jason Jeremiah Gérôme Calvès Frédéric De Ville De Goyet Kyle Reuber

Table S2

Continental Margin

Margin (machine learning)

10.6084/m9.figshare.14413843

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Citations (0)

HEMICYCLAMMINA WHITEI (HENSON, 1948): THE SENIOR SYNONYM OF HEMICYCLAMMINA SIGALI MAYNC 1953, A DISTINCTIVE LARGER BENTHONIC FORAMINIFER FROM THE MID-CRETACEOUS OF NEOTETHYS

Acta Palaeontologica Romaniae (2022)

Michael D. Simmons Mike Bidgood

In 1953 Wolf Maync introduced the lituolid (now regarded as loftusiid) foraminiferal genus Hemicyclammina, with its type species Hemicyclammina sigali from the Cenomanian of Algeria. Since then, this distinctive microfossil has been frequently reported from mainly Neotethyan mid-Cretaceous (mostly Albian and Cenomanian) sedimentary rocks in locations as far apart as Brazil and Oman. However, Maync was seemingly unaware of the 1948 publication of Francis R.S. Henson in which a new species of foraminifera, Cyclammina whitei, was described from the mid-Cretaceous of the Middle East. During the course of the last 70 years, C. whitei has been placed in the genus Hemicyclammina, tenuously regarded as distinct from H. sigali. We demonstrate that H. whitei and H. sigali are synonyms, with H. whitei the senior synonym, and hence the type species of Hemicyclammina. This argument is supported by the re-illustration of the type material of H. whitei and H. sigali. It is also argued that a number of poorly known taxa (e.g., Hemicyclammina evoluta Hamaoui, Ismailia neumannae El-Dakkak, Sinainella aegyptiaca El-Dakkak) are most likely the junior synonyms of H. whitei and that thus, for the Albian – Cenomanian at least, there is only one species of Hemicyclammina. Limited Barremian/Aptian records of Hemicyclammina are probably best assigned to a potentially ancestral form herein termed “Hemicyclammina? sp.” pending access to further material and a full assessment of the evolution of Hemicyclammina. A critical review of the many published records demonstrates that H. whitei ranges throughout the Albian and Ceno-manian, although locally it may have a more restricted range because of facies control on its inception, extinction, and abundance. It is confidently known to occur from southern and central America, North Africa, the Mediterranean, the Arabian Plate and Somalia.

Cenomanian

Aptian

Synonym (taxonomy)

10.35463/j.apr.2023.01.03

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Citations (1)

A revised chronostratigraphic framework for the Aptian of the Essaouira-Agadir Basin, a candidate type section for the NW African Atlantic Margin

Cretaceous Research (2018)

Tim Luber Luc G. Bulot Jonathan Redfern Mohamed Nahim Jason Jeremiah

Aptian

Sequence Stratigraphy

Sequence (biology)

10.1016/j.cretres.2018.09.007

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Citations (24)