Late Devonian conodonts and event stratigraphy in northwestern Algerian Sahara

Mahboubi, Abdessamed; Gatovsky, Yu. A.

doi:10.1016/j.jafrearsci.2014.10.004

Cited by 7 publications

(10 citation statements)

References 23 publications

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“…This transgressive peak is characterized by a significant extension of deep-sea lithofacies, associated with conodont records dominated by biofacies Polygnathus-Palmatolepis. This signal is most obvious at Ben Zireg (Mahboubi et al 2015), whereas at South Marhouma the paucity of available conodont records prevents confirmation of the slight deepening of the sedimentary setting (Mahboubi & Gatovsky, 2014). The curve of Ben Zireg remarkably coincides with the curves obtained in Euramerica and in the Tafilalt (Fig.…”

Section: C3 Late Frasniansupporting

confidence: 58%

“…Integrating both lithofacies and MS data (Figs 8, 9), as well as data of conodont biofacies (Seddon & Sweet, 1971;Sandberg, 1976;Klapper & Barrick, 1978;Sandberg & Ziegler, 1979) published on both studied sections (Mahboubi & Gatovsky, 2014;Mahboubi et al 2015), we tentatively interpret environmental changes through middle-late Frasnian time in terms of bathymetrical variation.…”

Section: C Sea-level Fluctuationsmentioning

confidence: 66%

“…The base of this section cannot be precisely dated because of a lack of conodont specimens. Details concerning conodont contents and their biostratigraphic implications were presented in Mahboubi & Gatovsky (2014). In contrast to Ben Zireg, this section is dominated by monotonous shale deposits rich in carbonate nodules (Fig.…”

Section: A2 South Marhouma Sectionmentioning

confidence: 99%

“…A Mahboubi et al (1987) and trilobites by Feist et al (2016), and ichnological analyses were performed by Bendella & Mehadji (2014). The first conodont research was conducted by Mahboubi & Gatovsky (2014) and revealed a rather moderate yield of often insignificant conodont elements (less than 10 conodonts per kilogram in most samples), preventing a fine-scaled biostratigraphic framework from being established. However, the presence of a restricted number of conodont zones, that is, Frasnian Zones (FZ) 5, 11, 12 and 13 (Klapper & Kirchgasser, 2016), were recognized with confidence, whereas zones 6 and 7 and 8-10 remain undifferentiated.…”

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confidence: 99%

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Frasnian (Upper Devonian) integrated facies analysis, magnetic susceptibility and sea-level fluctuations in the NW Algerian Sahara

et al. 2018

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Changes in the palaeoenvironment are investigated in two representative Frasnian sections of the NW Algerian Sahara, integrating sedimentology and magnetic susceptibility (MS). The Ben Zireg section is characterized by condensed and ferruginous calcareous deposits; in the South Marhouma section the sedimentation rate is high, dominated by muddy nodular limestones with several hypoxic shale intervals. In both sections, sediments were mostly emplaced on pelagic outer ramps below the limit of storm wave-base, evolving through time from proximal to distal setting. Investigations of the temporal evolution of facies and MS data permit a first estimate of the local sea-level trends in NW Algeria. These trends match the overall long-term rise of sea level recognized worldwide from Frasnian Zone 5 upwards. Noteable positive excursions of the sea-level curve related to the semichatovae transgression, as well as to the late Frasnian transgression prior to the late Kellwasser event, can be established in this area. Although the sharp regression of sea level at the upper Kellwasser level can be confirmed from our data, no particular trend is depicted at the transition of conodont zones (Frasnian Zones 12–13) where the presence of the lower Kellwasser level has not yet been clearly recognized.

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Section: C3 Late Frasniansupporting

confidence: 58%

Section: C Sea-level Fluctuationsmentioning

confidence: 66%

Section: A2 South Marhouma Sectionmentioning

confidence: 99%

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confidence: 99%

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Frasnian (Upper Devonian) integrated facies analysis, magnetic susceptibility and sea-level fluctuations in the NW Algerian Sahara

et al. 2018

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“…This marker bed is characterised by numerous goniatites Mesobeloceras Glenister, 1958 covering the surface of the bedding plane. It is included in a series of alternating dark shales and solid pseudo-nodular bioclastic limestone beds of deep water outer ramp environment that characterise the uppermost 20 m of the Cheffar el Ahmar Formation with conodonts of MN Zones 5 to 8 (Mahboubi & Gatovsky 2015). The first known Frasnian trilobites of the Saoura region, i.e.…”

Section: Location Stratigraphy and Trilobite Recordmentioning

confidence: 99%