The global Taghanic Biocrisis (Givetian) in the eastern Anti-Atlas, Morocco

Aboussalam, Zhor Sarah; Becker, Ralf

doi:10.1016/j.palaeo.2010.10.015

Cited by 56 publications

(35 citation statements)

References 33 publications

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“…As for other marine faunas (e.g. May 1995, House 2002, Aboussalam 2003, Baird & Brett 2008, Aboussalam & Becker 2011) the Taghanic Biocrisis leads to a reduction in provincialism among the benthic ostracod community. Due to the Givetian/Frasnian transgression and the subsequent drowning of the Givetian carbonate platform (Boulvain et al 2009) the geographical barriers are removed and more cosmopolitan ostracod taxa can now immigrate in the Late Givetian (Lethiers 1983b).…”

Section: Discussionmentioning

confidence: 99%

“…This transgression can be recognized everywhere in the Ardennes and also in the Boulonnais (around the Griset/Blacourt Fms boundary). However, according to Bultynck et al (2001), it does not correspond to the global Taghanic Onlap (Johnson 1970, House 1975; = transgressive episode IIa-Tagh in Aboussalam & Becker 2011), as it is older. The second transgression is connected with a global sea level rise around the Givetian/Frasnian boundary, which leads to the collapse of the Givetian carbonate platform and the disappearance of its reefal barriers (Boulvain et al 2009, Casier 1987.…”

Section: Geographical and Geological Settingmentioning

confidence: 99%

“…This paper contributes to the project by documenting the ostracod fauna and its biodiversity in the historical type area of the Givetian, spanning a period during which several environmental and climatic events took place. The Taghanic Biocrisis (House 1985, Aboussalam & Becker 2011), a period of major faunal change around the Middle/Late Givetian boundary, as well as the global sea level rise and climatic and sedimentary changes close to the Givetian/Frasnian boundary are of special interest, as these events are reflected in the ostracod distribution.…”

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confidence: 99%

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Stratigraphical distribution of Givetian ostracods in the type-area of the Fromelennes Formation (Fromelennes, Ardennes, France) and their relationship to global events

Maillet¹,

Dojen²,

Milhau³

2013

Bull. Geosci.

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Section: Discussionmentioning

confidence: 99%

Section: Geographical and Geological Settingmentioning

confidence: 99%

mentioning

confidence: 99%

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Stratigraphical distribution of Givetian ostracods in the type-area of the Fromelennes Formation (Fromelennes, Ardennes, France) and their relationship to global events

Maillet¹,

Dojen²,

Milhau³

2013

Bull. Geosci.

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“…The microalgal bed and the fossils it contains were thus involved in the lower Tully Bioevent [38,39,44] which records the incursion of Old World faunal elements into the Appalachian Basin and the concurrent disappearance of endemic North American forms. This episode is the early phase of the Global Taghanic Biocrisis which re-structured the biotic composition of the ocean both regionally in the Northern Appalachian Basin [38,39,[44][45][46] and globally [47][48][49][50] disappearance of endemic North American forms. This episode is the early phase of the Global Taghanic Biocrisis which re-structured the biotic composition of the ocean both regionally in the Northern Appalachian Basin [38,39,[44][45][46] and globally [47][48][49][50] via eradication of much of the provincialism that had characterized Lower Devonian faunas.…”

Section: Microfossil Occurrencementioning

confidence: 99%

A Mineralized Alga and Acritarch Dominated Microbiota from the Tully Formation (Givetian) of Pennsylvania, USA

Chamberlain

Brown

2016

Geosciences

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Sphaeromorphic algal cysts, most probably of the prasinophyte Tasmanites, and acanthomorphic acritarch vesicles, most probably Solisphaeridium, occur in a single 20 cm thick bed of micritic limestone in the lower part of the Middle Devonian (Givetian) Tully Formation near Lock Haven, Pennsylvania. Specimens are composed of authigenic calcite and pyrite crystals about 5-10 µm in length. Some specimens are completely calcitic; some contain both pyrite and calcite; and many are composed totally of pyrite. The microfossils are about 80 to 150 µm in diameter. Many show signs of originally containing a flexible wall composed of at least two layers. Some appear to have been enclosed in a mucilaginous sheath or membrane when alive. The acanthomorphic forms have spines that are up to 20 µm in length, expand toward the base, and are circular in cross-section. The microflora occurs with microscopic molluscs, dacryoconarids, the enigmatic Jinonicella, and the oldest zooecia of ctenostome bryozoans known from North America. The microalgal horizon lacks macrofossils although small burrows are present. Microalgae and acritarchs have been preserved via a complex preservational process involving rapid, bacterially-mediated post-mortem mineralization of dead cells. The microfossil horizon, and possibly much of the Tully Formation at Lock Haven with similar lithology, formed in a relatively deep, off-shore basin with reduced oxygen availability in the substrate.

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“…1) of pharciceratid faunas and of previous reports from the Anti-Atlas, the reader is referred to Bockwinkel et al (2009). The late Givetian ammonoid zonation and conodont correlation within the Tafilalt region was summarized by Becker & House (2000a, 2000b and Aboussalam & Becker (2007 …”

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confidence: 99%

Late Givetian ammonoids from Hassi Nebech (Tafilalt Basin, Anti-Atlas, southern Morocco)

Bockwinkel¹,

Becker

Ebbighausen³

2013

Foss. Rec.

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The Hassi Nebech area of the SE Tafilalt (Tafilalt Basin, Anti-Atlas, Morocco) yielded the richest and most diverse late Givetian ammonoid fauna on a global scale. Above the distinctive regional "Lower Marker Bed" (Synpharciceras clavilobum Zone), abundant loosely collected limonitic specimens derive from hypoxic shales of the Taouzites taouzensis to Petteroceras errans zones. The ontogenetic morphometry and intraspecific variability of a total of 30 species representing five families, the Acanthoclymeniidae, Taouzitidae, Pharciceratidae, Petteroceratidae, and Tornoceratidae, are documented. New taxa are: Pseudoprobeloceras praecox n. sp., Scaturites minutus n. gen. n. sp., Darkaoceras velox n. sp., Pharciceras decoratum n. sp., Ph. fornix n. sp., Ph. subconstans n. sp., Ph. involutum n. sp., Lunupharciceras incisum n. sp., Transpharciceras procedens n. gen. n. sp., Stenopharciceras progressum n. sp., Pluripharciceras n. gen. (type species: Synpharciceras plurilobatum Petter, 1959), Plu. orbis n. sp., Synpharciceras frequens n. sp., Lobotornoceras bensaidi n. sp., Nebechoceras eccentricum n. gen. n. sp., and Phoenixites lenticulus n. sp. The documentation of conch and particularly suture ontogeny and intraspecific variability necessitates a revised diagnosis for ten taxa. Manticoceras pontiformis Termier & Termier, 1950, Probeloceras costulatum Petter, 1959, and Pseudoprobeloceras nebechense Bensaïd, 1974 are regarded as subjective junior synonyms of Ps. pernai (Wedekind, 1918). Sandbergeroceras acutum Termier & Termier, 1950 is a subjective synonym of Taouzites taouzensis (Termier & Termier, 1950). Pharciceras applanatum Bensaïd, 1974 is transferred to Extropharciceras. Other forms (Ph. aff. tridens, Ph. cf. subconstans n. sp., Extropharciceras n. sp. 2, Ex. cf. arenicum, Ex. cf. applanatum, Synpharciceras sp., Plu. cf. plurilobatum) are described in open nomenclature. doi:<a href="http://dx.doi.org/10.1002/mmng.201300001" target="_blank">10.1002/mmng.201300001</a>

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The global Taghanic Biocrisis (Givetian) in the eastern Anti-Atlas, Morocco

Cited by 56 publications

References 33 publications

Stratigraphical distribution of Givetian ostracods in the type-area of the Fromelennes Formation (Fromelennes, Ardennes, France) and their relationship to global events

Stratigraphical distribution of Givetian ostracods in the type-area of the Fromelennes Formation (Fromelennes, Ardennes, France) and their relationship to global events

A Mineralized Alga and Acritarch Dominated Microbiota from the Tully Formation (Givetian) of Pennsylvania, USA

Late Givetian ammonoids from Hassi Nebech (Tafilalt Basin, Anti-Atlas, southern Morocco)

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