Route Nationale RN13 to Midelt town, Talghemt section, TdB28 (Jurassic of Morocco)

Where: Morocco (32.6° N, 4.5° W)

• Paleocoordinates: 26.4° N, 4.6° E (Wright 2013)

• coordinate stated in text

When: Emaciatum ammonoid zone, Ouchbis Formation, Late/Upper Pliensbachian (189.6 - 183.0 Ma)

• The Talghemt section offers one of the best sedimentary records of the Pliensbachian-Toarcian transition in the Tethyan realm. The Talghemt section was previously proposed as a candidate section for the Toarcian GSSP (Elmi, 2006) given its richness in ammonite fauna and also because of the excellent quality of outcrops and the easy access to the strata.

• bed-level stratigraphic resolution

Environment/lithology: basinal (); lithified, calcareous, carbonaceous limestone and lithified, carbonaceous marl

• The Talghemt section is ~69 m thick and encompassed the Pliensbachian-Toarcian transition and early Toarcian pelagic sediments.
• The Pliensbachian-Toarcian transition is composed of marl-limestone alternations of the Ouchbis Formation. The limestone beds are numbered with even numbers and the marls named with odd numbers. The lowermost part (0-8 m) of the section, at the Pliensbachian-Toarcian transition, is composed marl-limestone alternations. The rest of the section, within the Polymorphum and Levisoni ammonite zones, consists of carbonate-rich clays.

•In detail, the interval from 8 to 29.1 m consist of homogenous carbonate-rich clays. Then, the interval from 29.1 to 48.3 m presents carbonate-rich clays with frequent intercalations of mm to cm scale turbidite levels, and with three dm scale turbidite levels 30.8, 38.2 and 38.7 m, and another thickest (25 cm) turbidite level, situated at around 42.8 m. The overlaying interval (48.5 to 69 m) consists of homogeneous carbonate-rich clays with only two levels of turbidite intercalations at 61 and 68 m.

Size class: macrofossils

Preservation: cast, mold/impression, original aragonite

Primary reference: S. Boulila, B. Galbrun, D. Sadki, S. Gardin, and A. Bartolini. 2019. Constraints on the duration of the early Toarcian T-OAE and evidence for carbon-reservoir change from the High Atlas (Morocco). Global and Planetary Change 175:113-128 [A. Kocsis/A. Kocsis/A. Kocsis]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 200357: authorized by Adam Kocsis, entered by Monica Alejandra Gomez Correa on 30.03.2019

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Hildoceratidae
Neolioceratoides ex gr. hoffmanni, "Paltarpites sp." = Protogrammoceras, Lioceratoides sp.
Neolioceratoides ex gr. hoffmanni Gemmellaro 1886 ammonite
"Paltarpites sp." = Protogrammoceras Spath 1913 ammonite
Lioceratoides sp. Spath 1919 ammonite