Risan Aneiza Fm (Aptian) - Gabal Manzur (Cretaceous of Egypt)

Where: Egypt (31.0° N, 33.5° E: paleocoordinates 7.1° N, 29.0° E)

• outcrop-level geographic resolution

When: Risan Aneiza Formation, Aptian (125.0 - 113.0 Ma)

• STRATIGRAPHIC RELATIONS: From lower 72 m of Risan Aneiza Formation, which underlies limestone of the Hala Fm (Cenomanian). THICKNESS: 414 m. AGE: Aptian based on multiple macrofossil biostratigraphic indicators.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, shelly/skeletal siltstone and poorly lithified, shelly/skeletal claystone

• ENVIRONMENT: No environmental data reported in text.
• SPECIFIC LITHOLOGY: Highly fossiliferous siltstone, claystone, marl and sandstone. LITHIFICATION: Assumed to be poorly-lithified based on figured specimens.

Size class: macrofossils

Collection methods: quarrying,

• COLLECTOR: Presumably collected by M.A. Abdelhamid during PhD research (1995). REPOSITORY: Geol. Dept., Fac. Science, Ain Shams University, Cairo.

Primary reference: M. A. Abdelhamid and M.M. Azab. 2003. Aptian-Cenomanian Echinoids from Egypt. Revue de Paleobiologie, Geneve 22(2):851-876 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 63979: authorized by Austin Hendy, entered by Austin Hendy on 29.08.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• IDENTIFIER: M.A. Abdelhamid (1995). NOMENCLATURE: From authoritative publication, appears to be modern, with species and subgeneric assignments. COMPLETENESS: Only echinoids listed. Gastropods, Bivalvia, and Cephalopoda are mentioned as present, but not identified (see Fourtau, 1921; Lambert, 1932).
Show authors, comments, and common names
Echinoidea
 Hemicidaroida -
Trochodiadema libanoticum
 Euechinoidea - Pseudodiadematidae
Tetragramma barthouxi
 Calycina - Diplopodiidae
"Pseudodiadema julii" = Diplopodia (Pseudodiadema)
"Pseudodiadema julii" = Diplopodia (Pseudodiadema) sea urchin
 Salenioida - Saleniidae
Leptosalenia humei
Leptosalenia humei Fourtau 1921 sea urchin
 Holasteroida - Holasteridae
Pseudoholaster barthouxi
 Spatangoida - Toxasteridae
Toxaster collegnoi, Toxaster radula, Toxaster lamberti
Toxaster collegnoi heart urchin
Toxaster radula heart urchin
Toxaster lamberti heart urchin
 Spatangoida -
"Toxaster dieneri" = Pliotoxaster dieneri
"Toxaster dieneri" = Pliotoxaster dieneri de Loriol 1887 heart urchin
 Cidaroida - Cidaridae
Cidaris dowsoni
Cidaris dowsoni pencil urchin