Pseudodictyopsella jurassica N. gen., n. sp., a new foraminifera from the early middle Jurassic of the Musandam Peninsula, N. Oman mountains; sedimentological and stratigraphical context

Septfontaine, Michel; Matos, José Esteves de

doi:10.1016/s0035-1598(98)90106-4

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Pseudodictyopsella jurassica and Mar zoella ficcarellii are first documented here for the AdCP in the area of the Biokovo Mt. This represents the sec ond occurrence of these forms in the World, after initial discovery of P. jurassica in Oman (SEPTFONTAINE & DE MATOS, 1998), and M. ficcarellii in Italy (CHI OCCHINI & MANCINELLI, 2000). P. maynci has previously only been observed at the Aalenian-Bajo cian transition on the AdCP, while in other parts of both major Neotethyan provinces it was described as being of Bathonian and Callovian age (BASSOULLET et al, l985;BASSOULLET, 1997).…”

Section: Jurassicmentioning

confidence: 64%

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2007

Geol Cro

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Section: Jurassicmentioning

confidence: 64%

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2007

Geol Cro

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“…The new clade appears earlier in the Middle Jurassic, with the small form Praekurnubia ancestor of the Late Jurassic larger Kurnubia and Conicokurnubia bioseries. The whole group shows an original innovation with the presence of a hypodermic network in the marginal zone of the chambers, the first known example in trochospirally arranged tests in the Jurassic, shared with the genus Pseudodictyopsella (Septfontaine and De Matos 1998) in the Bajocian of Oman and the Dinarids (Velic 2007). This novelty among trochospiral LIF is interpreted herein as tentatives (at least two) of a new association of LIF with larger symbiotic algae (dinoflagellates) succeeding to the probable symbiosis of pfenderinids-valvulinids 3.…”

Section: Valvulinids (Plate 83 and Table 84)mentioning

confidence: 99%

“…Other carbonate platforms around the Mesozoic Neotethys (e.g., Arabia, Oman, Adria, the Apennines) contain orbitopsellids as well. These platforms have a long history from the Triassic to the Cretaceous (Septfontaine and De Matos 1998;Cobianchi and Picotti 2001;Velic 2007;Husinec and Read 2007;Tisljar and Velic 1993;Ciocchini et al 2008), recording hundreds of parasequences to third-order sequences in formations of thousands of meters thickness. However, the microfossil record in Liassic beds is often scarce or concentrated to some horizons only, due to facies variations and discontinuities.…”

Section: At a Shorter Time Scale A Case Historymentioning

confidence: 99%

Steps of Morphogenesis and Iterative Evolution of Imperforate Larger Foraminifera in Shallow Carbonate Shelves During Mesozoic Times: Possible Relations to Symbiotic and Abiotic Factors

Septfontaine

2020

Morphogenesis, Environmental Stress and Reverse Evolution

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The microgranular/agglutinated imperforate larger foraminifera (ILF, chiefly "lituolids") of Mesozoic shallow marine carbonate shelves are a polyphyletic group of K-strategists, ecologically homogeneous inhabitants of the photic zone (nutrient poor) and hosting symbionts as their larger porcelaneous recent equivalents. They contrast with deeper water "lituolid" taxa and other deeper marine dwellers (hyaline perforate and planktonics r-strategists). They are narrowly linked to the carbonate platform history and evolution, birth and demise (correlated to paleotectonics or sea-level variations), and global climatic or volcanic events, OAE, etc.2. General principles used in evolutionary sciences can be applied to decipher some morphological pathways among foraminifera through time to reconstruct phylogenetical arborescences, e.g., embryology (heterochronies of development), recapitulation law (Haeckel), size increase (Depéret), parallel evolution, and biostratigraphy.3.Iterative evolution is the main mode of morphological variation through time and biostratigraphy helps to reconstruct the time repartition of diverging advanced homeomorphic taxa and their distinction. The new characters are issued from a constant, more tolerant stock of smaller and simpler primitive atavic forms by the transformation of previous structures or the addition of new ones. Advanced homeomorphic taxa are temporarily preserved and their morphological innovations linked probably to (epi)genetic constraints and symbiotic history increasing their energy efficiency in a rather stable (but cyclical) environment.4.Morphological innovations appear slowly during the Jurassic and more rapidly (and frequently) during the Cretaceous following a probable saltative and allopatric mode of evolution during favorable periods after main environmental crisis, anoxia, and sea-level changes. The Cretaceous is a time of great diversification (adaptive radiation of microgranular lituolids and larger porcelaneous tests).5.Morphological changes at a scale of one or two stages in one evolutive bioseries (general trend: size and internal complications increase) cannot be linked to global events or other abiotic factors (e.g., the orbitopsellids in the Pliensbachian) but are rather driven by internal epigenetic factors related to algal symbiosis and coevolution. The constancy of the model (text Fig. 8.2) through time in variable clades could be explained that way. The structural incompatibility between pseudokeriotheca/alveolae within the wall and marginal microstructures (radial partitions or hypodermic network) could be explained by a biological incompatibility of bacterial symbionts to live aside with larger microalgae as dinoflagellates. Local discontinuous events like cyclic (metric) parasequences are common on carbonate platforms but have no apparent influence on morphogenesis or population composition.6.Conversely, global environmental crises affect deeply the larger foraminifera (chiefly advanced larger tests) and population compositions at a higher taxonomic ...

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High Resolution Fracture Analyses and 3d DMX DFN Modeling of Triassic Dolomites; Wadi Bih, Ras Al Khaimah UAE

Dijk¹,

Lazzar²

2020

Day 3 Wed, November 11, 2020

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The present paper regards a high-resolution 3d fracture DMX modelling exercise applied to Triassic dolomites of the Ghail Fm, outcropping along Wadi Bih in the territory of Ras Al-Khaimah (UAE). The outcropping rocks show a low primary porosity, are well bedded and highly fractured (jointed) up to cm scale. They are an equivalent of the hydrocarbon producing Khuff Fm in the subsurface, and as such the exersice shows the relevance of applying new technologies to outcrop observations to confront with subsurface situations. Secondly, the exersize shows several new unique elements and related technologies not presented previously. The workflow presented which allows to arrive from observations to a 3d data driven fracture model, applying new technologies and algorithms using specific modules of the DMX protocol. Data collected comprise direct hand measurements of fractures and bedding planes, and 3d calibrated HR photographs. The scale of the model ranges from cm to meter scale fractures (core to borehole image scale). The parameters that have been analysed are size (length, height), orientation (set recognition), truncation relationships (BIXTV) between fractures and bedding planes, and spatial distribution (spacing) of the single fracture sets. The analyses and confrontation between the bedding tilt and the orientation of the 5 recognised fracture sets demonstrates that the fracture network is passively tilted with the bedding plane. A methodology is presented to arrive from in principle 1d (lineament) observations upon 2d sections (bedding planes surfaces and vertical sections) to statistical models and the usage in 3d fracture modeling. The resulting 3d model is generated as a Data Driven Model using the DMX protocol, which is directly connected to the observed features which are themselves present in the model, and comprises 5 sets with the following parameters reflecting the observed mathematical models: Specific spatial spacing relationships, size distributions (lengths and heights), relationships with modelled bedding plane surfaces, undulation of fractures, and 3d spatial truncations (XTV) between fractures and between fractures and bedding planes. This model is interrogated for 3d connectivity in different directions, P32 density (related to fracture porosity) and can be confronted with subsurface datasets from (preferably oriented) cores. The example shows for the first time how relatively simple and straightforward observations, which can be collected by hand, or with 3d stereofotogrammetrical techniques or drone technologies, can be used to build 3d analogue models that accurately mimic geological relationships.

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Pseudodictyopsella jurassica N. gen., n. sp., a new foraminifera from the early middle Jurassic of the Musandam Peninsula, N. Oman mountains; sedimentological and stratigraphical context

Cited by 7 publications

References 6 publications

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Steps of Morphogenesis and Iterative Evolution of Imperforate Larger Foraminifera in Shallow Carbonate Shelves During Mesozoic Times: Possible Relations to Symbiotic and Abiotic Factors

High Resolution Fracture Analyses and 3d DMX DFN Modeling of Triassic Dolomites; Wadi Bih, Ras Al Khaimah UAE

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