JBH-B6 Jebel Boulahoujeb, Lansarine Chain (Cretaceous of Tunisia)

Where: Tunisia (36.8° N, 9.6° E: paleocoordinates 23.2° N, 14.2° E)

• coordinate estimated from map

When: Criosarasinella furcillata ammonoid zone, H1 Member (El Mergueb Formation), Late/Upper Valanginian (140.2 - 136.4 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 205401: authorized by Adam Kocsis, entered by Monica Alejandra Gomez Correa on 15.10.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

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Cephalopoda
 Ammonitida - Lytoceratidae
Lytoceras sp., Lytoceras subfimbriatum
Lytoceras sp. Suess 1865 ammonite
categories based on specimen counts
Lytoceras subfimbriatum d'Orbigny 1841 ammonite
categories based on specimen counts
 Ammonitida - Neocomitidae
"Teschenites sp." = Neocomites (Teschenites)
"Teschenites sp." = Neocomites (Teschenites) Thieuloy 1971 ammonite
categories based on specimen counts
 Ammonitida - Haploceratidae
Neolissoceras grasianum
Neolissoceras grasianum d'Orbigny 1841 ammonite
categories based on specimen counts