Ameki Fm: Litho and Fauna - Ostrea Zone (Eocene of Nigeria)

Also known as Lithology and Faunal Composition of the Ostrea assemblage zone, Unit 1, Ameki Formation

Where: Nigeria (5.6° N, 7.6° E: paleocoordinates 0.2° S, 1.6° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Ameki Formation, Eocene (56.0 - 33.9 Ma)

• This assemblage zone lies superjacent on the Callianassa-Buliminella-Paracypris assemblage zone and is about 65 m thick.

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; poorly lithified, gray, green, calcareous sandstone and poorly lithified siltstone

• intertidal
• Silty to fine grained light grey-green coloured sandstones and siltstones, poorly consolidated, with variable amounts of clay, calcareous, thick bedded structrueless to finely laminated make up the bulk of this unit which is about 117 m thick.

Size classes: macrofossils, mesofossils, microfossils

Primary reference: I. Arua and V.R. Rao. 1987. New stratigraphic data on the Eocene Ameki Formation, southeastern Nigeria. Journal of African Earth Sciences 6(4):391-397 [L. Ivany/P. Wall/P. Wall]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 46247: authorized by Linda Ivany, entered by Patrick Wall on 09.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Echinoidea
 Clypeasteroida - Fibulariidae
Fibularia sp.
Fibularia sp. Lamarck sand dollar
Chondrichthyes
 Myliobatiformes - Myliobatidae
Myliobatis sp.
Myliobatis sp. Cuvier 1816 eagle ray
Cephalopoda
 Nautilida - Hercoglossidae
Deltoidonautilus sp.
Deltoidonautilus sp. Spath 1927 nautiloid
Gastropoda
 Cerithioidea - Turritellidae
Turritella sp.
Turritella sp. Lamarck 1799 turret shell
Bivalvia
 Ostreida - Ostreidae
Ostrea sp.
Ostrea sp. Linnaeus 1758 oyster