Contribution
First evidence of the benthic foraminifera Alveosepta jaccardi from the Oxfordian of the Saharan Atlas (Algeria): Palaeoenvironmental and palaeoecological implications
Mahboubi, Chikh Younes; Nadir Naimi, Mohammed; Ouali Mehadji, Abdelkader; Garah, Abdelmoumen; Langer, Martin R.; Limam, Hicham
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen Band 307 Heft 2 (2023), p. 91 - 100
59 références bibliographiques
publié: Feb 28, 2023
manuscrit accepté: Jan 11, 2023
manuscrit reçu: Oct 14, 2022
ArtNo. ESP155030702000, Prix: 29.00 €
Abstract
Microfacies studies conducted on carbonate deposits of the Theniet Et‑Temar Formation (Upper Jurassic, Middle Oxfordian) from the Central Saharan Atlas in Algeria revealed low-diversity microfossil assemblages dominated by the large benthic foraminifer Alveosepta jaccardi. The species is an index taxon for the Middle-Upper Oxfordian – Lower Kimmeridgian time interval. It has been recorded previously from Lower Kimmeridgian strata of neighbouring areas. In our study area, a Middle Oxfordian age has been attributed to the foraminifera-bearing deposits based on brachiopod faunas. This constitutes the oldest record of this species from the North African Tethys margin in Algeria. Microfacies analysis suggests a deposition in a shallow, sheltered and moderately eutrophic inner platform environment with low- to medium-energy conditions.
Mots-clefs
Upper Jurassic •
Central Saharan Atlas •
Middle Oxfordian •
Stratigraphy •
Larger benthic foraminifera •
Alveosepta jaccardi