Ammonoids from the late Givetian Taouzites Bed of Ouidane Chebbi (eastern Tafilalt, SE Morocco)

Bockwinkel, Jürgen; Becker, Ralph Thomas; Aboussalam, Zhor Sarah

doi:10.1127/njgpa/2017/0664

Cited by 7 publications

(6 citation statements)

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“…Epitornoceras mithracoides cannot really be confused with any other ammonoid species from the Rhenish Mountains because of the subacute ventrolateral saddle. Very similar forms have been reported from the Anti-Atlas of Morocco and identified as this species (Bockwinkel et al 2009(Bockwinkel et al , 2013a(Bockwinkel et al , 2017. These specimens have a very similar conch form to the red ironstone specimens, but show a suture line with a considerably deeper adventive lobe characterised by nearly parallel flanks.…”

Section: Remarkssupporting

confidence: 77%

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The tornoceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Korn

Bockwinkel²

2022

EJT

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The ammonoids of the suborder Tornoceratina from the Middle to Late Devonian Red Ironstone Formation of the area around Dillenburg (eastern Rhenish Mountains) are revised, mainly based on historical collections stored in the Museum für Naturkunde, Berlin. The species Tornoceras typus (Sandberger & Sandberger, 1851), Tornoceras frechi Wedekind, 1918 and Epitornoceras mithracoides (Frech, 1888) are re-described based on the original material from the Red Ironstone. The new genus Lentitornoceras gen. nov. is proposed for the new species L. materni gen. et sp. nov.; the new genus Paucitornoceras gen. nov. is proposed with the type species Goniatites paucistriatus. Epitornoceras transmediterraneum sp. nov. is described from the Anti-Atlas of Morocco and compared with E. mithracoides.

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Section: Remarkssupporting

confidence: 77%

“…For a detailed description of the species (Bockwinkel et al 2009(Bockwinkel et al , 2013a(Bockwinkel et al , 2017.…”

Section: Descriptionmentioning

confidence: 99%

The tornoceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Korn

Bockwinkel²

2022

EJT

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“…Cephalopod diversity became rather high towards the end of the Givetian with tens of ammonoid species (Bockwinkel et al . , ) as well as other cephalopods and only rare benthics. On the slope from the Tafilalt to the Maïder Basin (Jebel Amessoui, Ottara), layers rich in allochthonous corals, stromatoporoids, crinoids and brachiopods alternate with claystone layers, yielding a more pelagic fauna.…”

Section: Palaeoecologymentioning

confidence: 99%

“…Synpharciceras clavilobum ammonoid Zone) of the northern Tafilalt Platform (Bockwinkel et al . , ); Moderate‐diversity cephalopod accumulations (several species of Archoceras Beloceras , Carinoceras , Crickites , Manticoceras , Tornoceratidae, Orthocerida, Oncocerida) occur in several layers, some associated with remains of arthrodires (upper Palmatolepis rhenana – Pa. linguiformis conodont Zones; Rücklin , ) and Archaeopteris wood fragments in the Kellwasser Limestone of the Tafilalt Platform and the southeastern Maïder Basin (Wendt & Belka ); Moderate‐diversity cephalopod accumulations (several species of Armatites , Cheiloceras , Falcitornoceras , Maeneceras , Paratorleyoceras , Polonoceras , Orthocerida, Oncocerida, Brachiopoda) in the early Famennian ( Cheiloceras subpartitum to Paratorleyoceras globosum ammonoid Zones) of the Tafilalt Platform and the southeastern Maïder Basin (Becker ). Low‐diversity cephalopod accumulations (several species of Platyclymenia , Prionoceras , Orthocerida) in the middle Famennian ( Platyclymenia annulata Zone) of the Tafilalt Platform and the southeastern Maïder region (Korn ; Korn et al . ).…”

Section: Exceptional Preservation and Fossil‐lagerstättenmentioning

confidence: 99%

Fossil‐Lagerstätten, palaeoecology and preservation of invertebrates and vertebrates from the Devonian in the eastern Anti‐Atlas, Morocco

Frey

Pohle

Rücklin

et al. 2020

LET

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In some Devonian strata in the eastern Anti‐Atlas, fossil invertebrates are abundant, display a high taxonomic diversity and indicate many shifts in palaeoecology. This is reflected in changes in faunal composition of invertebrates and vertebrates. Fossils of jawed vertebrates of late Lochkovian and younger age have been recorded and are relatively common with their abundance and diversity increasing towards the Late Devonian. Environmental changes in the Devonian also left their mark in the preservation of vertebrates and invertebrates from the Anti‐Atlas, which varies strongly through time and regionally. This variation partially reflects environmental changes linked with the evolution of small marine basins during the disintegration of the continental shelf of Gondwana in this region, fluctuations of the regional sea level and other environmental changes. To improve our understanding of these ecological changes, of shifts in preservation through the succession and of the formation of Fossil‐Lagerstätten, we analysed the mineral composition of some invertebrate and vertebrate samples of Devonian and Early Carboniferous age by Raman spectroscopy and X‐ray diffraction. Additionally, we characterized some of these Fossil‐Lagerstätten using palaeontological and sedimentological parameters. We examined eight Devonian Konzentrat‐Lagerstätten and two Konservat‐Lagerstätten with soft‐tissue preservation (the Famennian Thylacocephalan Layer and the Hangenberg Black Shale of the southern Maïder). The last two are the first Konservat‐Lagerstätten described from the Devonian of North Africa. The taphonomic and oceanic settings suggest that these Konservat‐Lagerstätten are formed because of stagnation (related to vertical restriction of water exchange and water depth rather than limited spatial water exchange and a lateral restriction) in the relatively small Maïder Basin with limited water exchange with the neighbouring Tafilalt Basin. The temporally low oxygen levels in the Maïder Basin are a possible reason for the reduced chondrichthyan diversity (missing demersal and shallow water species) compared to the Tafilalt Platform.

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“…Pharciceras galeatum has some similarity to Oxypharciceras chebbiense Bockwinkel, Becker & Aboussalam, 2017, but differs in the shape of the venter, which is distinctively oxyconic from ca 60 mm dm in O. chebbiense but tectiform in P. galeatum.…”

Section: Korn D and Bockwinkel J Ammonoids From The Roteisenstein Formationmentioning

confidence: 99%

The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Korn

Bockwinkel²

2021

EJT

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460

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The ammonoids of the suborder Pharciceratina from the Red Ironstone Formation of the area around Dillenburg (eastern Rhenish Mountains) are revised, mainly based on historical collections stored in the Museum für Naturkunde, Berlin. The genus Evopharciceras gen. nov. and the following species are newly described: Maenioceras ornatum sp. nov., Pharciceras beyrichi sp. nov., Pharciceras kruegeri sp. nov., Pharciceras ferrum sp. nov., Evopharciceras formosum gen. et sp. nov., Extropharciceras metallicum sp. nov., Lunupharciceras kochi sp. nov., Stenopharciceras lotzi sp. nov., Pluripharciceras ahlburgi sp. nov. and Sandbergeroceras archiaci sp. nov. Neotypes are proposed for the species Extropharciceras becheri (von Buch, 1832) and Sandbergeroceras costatum (d’Archiac & de Verneuil, 1842). The stratigraphic distribution of the genera is discussed; they are assigned to three assemblages: (1) Maenioceras terebratum Zone (early Givetian; two species), (2) Pseudoprobeloceras pernai Zone (latest Givetian; fifteen species) and (3) Sandbergeroceras costatum Zone (early Frasnian; three species).

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Ammonoids from the late Givetian Taouzites Bed of Ouidane Chebbi (eastern Tafilalt, SE Morocco)

Cited by 7 publications

References 0 publications

The tornoceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

The tornoceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Fossil‐Lagerstätten, palaeoecology and preservation of invertebrates and vertebrates from the Devonian in the eastern Anti‐Atlas, Morocco

The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

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