Macro-invertébrés du Cénomanien du Djebel Metrassi (Batna, NE Algérie): Systématique et biostratigraphie

Abstract

[fr] Un assemblage paléontologique a été récolté dans le Cénomanien du Djebel Metrassi (Batna, NE Algérie). Constitué de 327 spécimens, il comporte un corail, 24 espèces de bivalves, 14 espèces de gastéropodes, 3 espèces d’ammonites et 7 espèces d’échinides. Cet assemblage permet d’établir une liste systématique originale, avec des espèces inédites, pour le Cénomanien de ce Djebel et vient soutenir le découpage lithostratigraphique proposé.

Quantitative analysis and paleoenvironmental reconstruction of the middle Cenomanian deposits from southern Bellezma-Batna Mountains (northeastern Algeria)

“…This unit is also rich in corals assigned to Aspidiscus cristatus (Lamarck, 1801), giving it a middle to late Cenomanian age (Pomel, 1872;Gill & Lafuste, 1987;Gill & Chikhi, 1991;Pandey et al, 2011). However, according to Aouissi et al (2018) and Salmi-Laouar et al (2019), the age of this unit is only middle Cenomanian. This unit is topped by an erosional surface and is composed of indurated bioclastic limestones containing fragments of bivalves and Planolites, which are well-observed.…”

“…According to Aouissi et al (2018Aouissi et al ( , 2020 and Salmi-Laouar et al (2019), in the Batna province, most of the specimens of Aspidiscus cristatus were collected in the middle part of the "Marnes de Smail" Formation. The stratigraphic distribution of this scleractinian established by these authors extends the Cunningtoniceras inerme Zone from the base of the middle Cenomanian, to the Acanthoceras jukesbrownei and the Acanthoceras amphibolum Zone, at the top of the middle Cenomanian (Table 2).…”

“…Most stratigraphic and sedimentological studies of northeastern Algeria and Bellezma-Batna Mountains have been focused mainly on fossil bioaccumulations at the Cenomanian-Turonian boundary (Chikhi-Aouimeur, 1983, 1998, 2010Herkat, 2007;Grosheny et al, 2008;Ruault-Djerrab& Kechid-Benkherouf, 2010;Chikhi-Aouimeur et al, 2011;Ruault-Djerrab et al, 2012;Aouissi et al, 2018Aouissi et al, , 2022Slami et al, 2018;Bensekhria et al, 2019, Mendir et al, 2019Benmansour, 2023). However, paleoenvironmental investigations in this area have not been undertaken since the study of Yahiaoui (1990).…”

Moluscos biválvios do Cretáceo Superior da Bacia de Sergipe: um estudo da seção turoniana Pedro Gonçalves

“…Cretáceo Superior do Egito na forma, convexidade e ornamentação da concha[23,26]. O material de Sergipe é semelhante ao descrito e ilustrado para o Cenomaniano do Nordeste[34] e Sudeste[35] da Argélia. Ocorrência.…”

“…Ocorrência. Aptiano-Turoniano da Índia; Cenomaniano da Portugal e da Argélia; Cenomaniano-Santoniano do Egito; Cenomaniano-"Senoniano" dos Camarões, Congo, Angola e Gabão; Turoniano da Jordânia, Tunísia e Nigéria; Coniaciano-Campaniano Inferior da Italia; Santoniano da Áustria; Campaniano da Alemanha, França e noroeste da Europa; Maastrichtiano da Polônia; Santoniano da Bélgica; Cenomaniano-Turoniano de Sergipe, Brasil[17,29,34,35,36,37,38]. Um exemplar preservado como molde externo com restos da concha (PG06-254).…”