PBDB Collection

JBH-B86 Jebel Boulahoujeb, Lansarine Chain (Cretaceous of Tunisia)

Where: Tunisia (36.8° N, 9.6° E: paleocoordinates 22.6° N, 14.3° E)

• coordinate estimated from map

When: Plesiospitidiscus ligatus ammonoid zone, H3 Member (El Mergueb Formation), Late/Upper Hauterivian (136.4 - 130.0 Ma)

• The section JBH-B starts after a lateral displacement of 10m to north–west from the top of section JBH-A. About 20m of limestone–marl alternations of the upper Valanginian are exposed at the base of the succession. The Hauterivian is represented by 783m of thickness, including a 65m gap of observation.

Environment/lithology: marine; lithified, calcareous limestone

• The Jebel Boulahouajeb section belongs the Tunisian trough a strongly subsiding basin from the Jurassic to Cretaceous time span. It corresponds to a deep marine palaeoenvironment characterized by pelagic-deep deposits.

• About 20m of limestone–marl alternations of the upper Valanginian are exposed at the base of the succession. The Hauterivian is represented by 783m of thickness, including a 65m gap of observation. The succession is characterized by calcareous bundles that are limestone-dominated intervals (thick calcareous beds and reduction of marl-bed thickness); they are separated by thick marl-dominated intervals. Starting by a sandstone bed (JBH-B3; 3 m, ochre's colour), the lower part of the section JBH-B is composed by two calcareous bundles named H1 (JBH-B5 to B20; 34 m)

Size class: macrofossils

Preservation: cast, mold/impression, original aragonite, original calcite

Primary reference: S. Melliti, S. Reboulet, N. Ben Haj Ali, M. S. Arfaoui, F. Zargouni and L. Memmi. 2019. Ammonoid and foraminiferal biostratigraphy from uppermost Valanginian to lowermost Barremian of the Jebel Boulahouajeb section (northern Tunisia). Journal of African Earth Sciences 151:438-460 [A. Kocsis/M. Gomez Correa]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 205694: authorized by Adam Kocsis, entered by Monica Alejandra Gomez Correa on 18.10.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Cephalopoda
Phylloceratida - Phylloceratidae	Phylloceratidae indet., Phyllopachyceras sp., Phyllopachyceras infundibulum Phylloceratidae indet. Zittel 1884 ammonite categories based on specimen counts Phyllopachyceras sp. Spath 1925 ammonite categories based on specimen counts Phyllopachyceras infundibulum d'Orbigny 1840 ammonite categories based on specimen counts
Ammonitida - Desmoceratidae	Plesiospitidiscus subdifficilis Plesiospitidiscus subdifficilis Karakasch 1907 ammonite categories based on specimen counts
Ammonitida - Lytoceratidae	Lytoceras sp. Lytoceras sp. Suess 1865 ammonite categories based on specimen counts
Ammonitida - Crioceratitidae	Balearites ? sp. Balearites ? sp. Sarkar 1954 ammonite categories based on specimen counts
Ammonitida - Pulchelliidae	Discoidellia cf. couratieri Discoidellia cf. couratieri ammonite categories based on specimen counts