Microfossils in Stratigraphy

Armstrong, H. L.; Brasier, Martin D.

doi:10.1002/9781118685440.ch3

Cited by 6 publications

(9 citation statements)

References 9 publications

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“…The forms, which are smooth and finely pitted, prefer finer substrate, while the highly calcified and ornamented forms prefer comparatively coarse-grained sediments. The substrate texture is known to control types of ostracod fauna (Brasier, 1980). The textural stability of sediment comprising the substrate exerts a strong influence on marine ostracods.…”

Section: Resultsmentioning

confidence: 99%

A first report on the distribution of Ostracod taxa in the Ashtamudi Lake, southwest coast of Kerala, India

Radhakrishnan,

Hussain,

Prakasheswar

et al. 2023

Journal of the Palaeontological Society of India

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The present study is the first taxonomical account of Ostracoda occurring in the sediments of the Ashtamudi Lake in Kerala, intending to generate a baseline for future palaeo-ecological or palaeoenvironmental applications. A total of 22 Ostracod species belonging to 16 genera, 11 families, 5 superfamilies and 2 suborders of the order Podocopida have been identified from 66 surface sediment samples collected across the lake. Sedimentological parameters, such as CaCO3, organic matter, sand silt and clay, were estimated and their distribution is discussed. The ratio between the carapaces and open valves has been taken into consideration for determining the rate of sedimentation in the study area.

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Section: Resultsmentioning

confidence: 99%

A first report on the distribution of Ostracod taxa in the Ashtamudi Lake, southwest coast of Kerala, India

Radhakrishnan,

Hussain,

Prakasheswar

et al. 2023

Journal of the Palaeontological Society of India

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“…S2 and further text describing the taxonomy of new specimens is provided in the supplementary data. Foraminifera (Mike Bidgood): Thirty-one samples with relatively abundant calcareous nannofossil content were chosen for micropaleontological analysis and prepared using the standard methodology described by Armstrong and Brasier (2013). Palynology (Frédéric de Ville de Goyet):…”

Section: Biostratigraphymentioning

confidence: 99%

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

Casson

Jeremiah²,

Calvès

et al. 2021

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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 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 underlying basement structure of thinned continental crust. Barremian-Aptian rifting in the Equatorial Atlantic folding and thrusting 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 TOC 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:https://doi.org/10.6084/m9.figshare.c.5280490

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“…The abundance, recalcitrance and diversity of acritarchs makes the group highly useful for palaeoecological analyses and biostratigraphical correlations of sedimentary successions, especially in Palaeozoic rocks (e.g. Armstrong and Brasier 2005), although our understanding of many aspects of acritarch biology and ecology is still limited.…”

Section: Introductionmentioning

confidence: 99%

Acritarch clusters from the Cambrian (Miaolingian) of the Příbram-Jince Basin, Czech Republic

2022

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Monogeneric clusters of five acritarch genera (Adara, Cymatiosphaera, Eliasum, Synsphaeridium and Timofeevia) were discovered in palynological residues obtained from fine-grained siliciclastic samples from the middle Cambrian (Miaolingian) Jince Formation of the P r ıbram-Jince Basin (Czech Republic). The clusters consist of two to more than 100 individual specimens and lack a common pattern of organisation. Acritarchs within clusters fall within a similar size range, regardless of generic affinity. Proposed mechanisms for the formation of these acritarch clusters are discussed: for the Jince Formation clusters, aggregation within algal blooms or primary colonial behaviour are the most plausible explanations. In addition, a summary of reports of acritarch clusters from lower Palaeozoic strata is included: clusters of a variety of acritarch genera have been documented from rocks of early Cambrian to Late Devonian age.

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Microfossils in Stratigraphy

Cited by 6 publications

References 9 publications

A first report on the distribution of Ostracod taxa in the Ashtamudi Lake, southwest coast of Kerala, India

A first report on the distribution of Ostracod taxa in the Ashtamudi Lake, southwest coast of Kerala, India

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

Acritarch clusters from the Cambrian (Miaolingian) of the Příbram-Jince Basin, Czech Republic

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