Commercial quarry near Aachich n’Ait Azza, Rahiat (Ordovician of Morocco)

Where: Anti-Atlas, Morocco (30.6° N, 5.1° W: paleocoordinates 80.1° S, 100.0° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Didymograptus murchisoni graptolite zone, middle Member (Taddrist Formation), Darriwilian (467.3 - 458.4 Ma)

• The fossiliferous bed is restricted stratigraphically to a 40–60 cm-thick interval within a succession of silty shales with decalcified nodules towards the middle part of the Taddrist Formation.

• member-level stratigraphic resolution

Environment/lithology: offshore shelf; silty shale

• silty shales with decalcified nodules

Size class: macrofossils

Preservation: concretion

Collection methods: Repository: Museo Geominero of Madrid, Spain (MGM), except one specimen (Fig. 3D, E) which remains in the private collection of Mr Nicolás Mesas (Cadrete, Spain).

Primary reference: I. Rabano, J. C. Gutiérrez-Marco, and D. C. García-Bellido. 2014. A remarkable illaenid trilobite from the Middle Ordovician of Morocco. Bulletin of Geosciences 89(2):365-374 [M. Uhen/M. Uhen/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 186254: authorized by Valerie Syverson, entered by Valerie Syverson on 18.06.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Corynexochida - Illaenidae
Caudillaenus nicolasi Rabano et al. 2014 trilobite
 Phacopida - Dalmanitidae
 Phacopida - Cheiruridae
Eccoptochile ? sp. Hawle and Corda 1847 trilobite
 Phacopida - Homalonotidae
Colpocoryphe sp. Novak and Perner 1918 trilobite
 Asaphida - Nileidae
 Hyolithida -
 Nuculida - Praenuculidae
Praenucula sp. Pfab 1934 clam
 Cyrtonellida -
Cyrtonellida indet. Horný 1963
 Orthoceratoidea -
Orthoceratoidea indet. Zhuravleva 1994
 Panreclinata - Dichograptidae
Didymograptus sp. McCoy 1851 graptoloid
Asterozoa indet. von Zittel 1895
Diploporita indet. Müller 1854
 Ichnofossils -
Teichichnus sp. Seilacher 1955
Palaeophycus sp. Hall 1847