Ichnostratigraphic correlation of Lower Palaeozoic clastics in the Kufra Basin (SE Libya)

Seilacher, Adolf; Lüning, Sebastian; Martin, M.; Klitzsch, Eberhard; Khoja, Abdallah; Craig, Jonathan

doi:10.1080/00241160260288848

Cited by 31 publications

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“…This radial infilling could occur when the dome was still active, by sediment expelled from the central shaft, or may occur if the upward doming of sediment occurred intrastratally, perhaps a few millimetres below the sediment water interface, whereby overlying sediment could fall into the radial cracks and hold them "open" after the dome or blister had collapsed and was later compressed. Seilacher et al (2002) invoked the presence of microbial biofilms or mats to facilitate doming and cracking processes in the formation of Astropolithon (see also Dornbos et al 2007), but we found no positive evidence of such biofilms in thin-sections or on bed interfaces of King Square structures.…”

Section: Comparison With Other Sedimentary Structurescontrasting

confidence: 52%

“…Originally described as a trace fossil (Dawson 1878), Astropolithon are now regarded as inorganic sedimentary structures (Pickerill and Harris 1979), but may form in association with microbially bound sediment (Seilacher et al 2002). Astropolithon are most common in turbidite or prodeltaic settings where rapid alternating deposition of oversaturated mud and sand occurs.…”

Section: Comparison With Other Sedimentary Structuresmentioning

confidence: 99%

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Hypothesized Cambrian medusae from Saint John, New Brunswick, reinterpreted as sedimentary structures

Hagadorn

Miller

2011

atgeol

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More than a hundred radial and discoidal structures occur on bed tops of shales and very fine sandstones of the Cambrian (Series 3) King Square Formation in New Brunswick, Canada. These structures typically contain a central sediment plug, radial lineations that extend outward from the central plug, concentric rings, and a broad trough surrounding or underlying ring margins. Originally interpreted as fossils of scyphozoan medusae, these structures could represent one of only a half-dozen mass strandings documented from the fossil record. Instead, re-evaluation of their sedimentology and morphology suggests that they are likely sedimentary structures known as Astropolithon. These sand-volcano-like structures formed by subsurface blistering, cracking, and failure of a near-surface or surface bed, triggered by the upward movement of gases or other fluids from underlying beds. RÉSUMÉPlus d'une centaine de structures radiales et discoïdes apparaissent au sommet des couches de schiste et de grès très fins de la formation King Square du Cambrien (Série 3), du Nouveau-Brunswick, au Canada. Ces structures contiennent généralement un culot sédimentaire central, des linéaments radiaux qui se déploient vers l'extérieur à partir du culot central, des anneaux concentriques, et une vaste cuvette qui ceinture le bord des anneaux ou qui se trouve en dessous. On estimait initialement qu'il s'agissait de méduses scyphozoaires, mais ces structures pourraient correspondre à l'une de la demi-douzaine d'échouages massifs de l'ichnofaune dont les vestiges fossiles ont été retrouvés. La réévaluation de leur contexte de sédimentation et de leur morphologie porte plutôt à croire que ce sont vraisemblablement des structures sédimentaires connues sous le nom d'astropolithon. Ces structures apparentées à un volcan de sable ont été formées par l'apparition d'alvéoles souterraines, le fendillement et la rupture d'une couche près de la surface ou à la surface, et qu'aurait provoquée le déplacement vers la surface de gaz ou d'autres fluides provenant des couches inférieures.[ Traduit par la redaction]atlantic geology 47, 66-80 (2011) 0843-5561|08|00066-15$3.25|o

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Section: Comparison With Other Sedimentary Structurescontrasting

confidence: 52%

Section: Comparison With Other Sedimentary Structuresmentioning

confidence: 99%

Hypothesized Cambrian medusae from Saint John, New Brunswick, reinterpreted as sedimentary structures

Hagadorn

Miller

2011

atgeol

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“….59–60), cited by Seilacher (), Turner & Benton (), Seilacher () and Seilacher et al . (). The occurrences of ‘ Cruziana petraea’ and C. rugosa respectively reported from northern Chad (Seilacher ) and eastern Sudan (Seilacher, ), both within the Kufra Basin, can be adscribed to the same unit.…”

Section: Regional Faunas and Correlationmentioning

confidence: 97%

The Bohemo‐Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gondwana

Gutiérrez-Marco

Sá

García‐Bellido

et al. 2017

LET

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The Bohemo‐Iberian regional scale for South Gondwana, involving the ‘Mediterranean Province’, comprises five regional stages (Arenigian, Oretanian, Dobrotivian, Berounian and Kralodvorian) plus the global Tremadocian and Hirnantian. The predominance of shallow‐water taxa in those high‐latitude faunas imposes serious difficulties for correlating the regional succession with the formal global chronostratigraphy because of the almost total absence of the key graptolites and conodonts defining the base of the standard series, stages and stage slices. Instead, the abundant benthic faunas (trilobites, brachiopods, molluscs, echinoderms) of South Gondwanan origin largely dominated in the area from the middle Darriwilian to the late Katian. The poleward faunal migration of originally Avalonian, Baltic, Laurentian and even Asiatic taxa during the Boda Event of global warming progressively ends with the endemicity in the region, where the ensuing benthic assemblages were severely affected by the Hirnantian glaciation. The regional scale significantly improves the precision of correlations between Ordovician strata from SW and central Europe, North Africa and a large part of the Middle East. An updated record of palaeontological data from areas where Mediterranean faunas remain practically unknown, or are still poorly investigated, is also included. Palaeobiogeographical relationships based on the distribution of faunas across South Gondwana are suggested as an improvement for positioning many territories in modern palaeogeographical reconstructions and offer a constructive approach to problems related to the pre‐Variscan and pre‐Alpine orogenic puzzles.

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“…Nevertheless, the only reliable dates are based on a proprietary subsurface palynological analysis from the northern Murzuq Basin (Ramos et al ., ). In other areas of southern Libya, Cruziana stratigraphy has suggested both Early and Middle Ordovician ages (Seilacher, , ; Seilacher et al ., ).…”

Section: Data and Interpretationsmentioning

confidence: 97%

Neoproterozoic–Devonian stratigraphic evolution of the eastern Murzuq Basin, Libya: a tale of tilting in the central Sahara

2012

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The Murzuq Basin is one of the most petroliferous basins of North Africa. Its remote eastern flank has been largely ignored since early reconnaissance work in the 1950s and 1960s. This article presents new stratigraphic and sedimentological data on the Neoproterozoic through Devonian succession from the Mourizidie and Dor el Gussa regions. The Neoproterozoic to Cambrian Mourizidie and Hasawnah formations in the eastern part of the Mourizidie region dip to the east and north-east, resting directly on late Precambrian metasediments and granitoids. These strata record the initial progradation of sand-dominated braidplain systems upon peneplained Precambrian basement. Rhyolite clasts in the Hasawnah Formation may record tectonically driven uplift and unroofing in the southern Tibesti Massif or tectonomagmatic rejuvenation to the south of this massif. In the western part of the Mourizidie region, Late Ordovician through Silurian strata (Mamuniyat and Tanezzuft-Akakus formations) directly overlie late Precambrian metasediments and granitoids, and dip at a low angle towards the west into the Murzuq Basin. Elsewhere at the eastern Murzuq Basin flank, in Dor el Gussa, Late Ordovician glaciogenic sediments rest with angular unconformity upon shallow marine sandstones of Cambrian-Ordovician age. This angular unconformity may also occur in the Mourizidie region and indicates widespread tectonism, either as a result of a Middle-Late Ordovician orogenic event, far-field tectonism related to the opening of the Rheic Ocean along the northern margin of Gondwana or alternatively crustal depression associated with the growth of Late Ordovician ice sheets. Unconformity development was also probably associated with glacial incision. Following ice sheet retreat, isostatic rebound during deglaciation resulted in uplift of tens to hundreds of metres, locally removing all Cambrian and Ordovician formations. Rising sea levels in the Silurian led to deposition of the Tanezzuft Formation on Precambrian basement in the northwestern Mourizidie region.

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Ichnostratigraphic correlation of Lower Palaeozoic clastics in the Kufra Basin (SE Libya)

Cited by 31 publications

References 0 publications

Hypothesized Cambrian medusae from Saint John, New Brunswick, reinterpreted as sedimentary structures

Hypothesized Cambrian medusae from Saint John, New Brunswick, reinterpreted as sedimentary structures

The Bohemo‐Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gondwana

Neoproterozoic–Devonian stratigraphic evolution of the eastern Murzuq Basin, Libya: a tale of tilting in the central Sahara

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