Ameki Fm: Litho and Fauna - Ostrea Zone: Eocene, Nigeria

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Nautilida - Hercoglossidae
Deltoidonautilus sp. Spath 1927
Gastropoda - Turritellidae
Turritella sp. Lamarck 1799
Bivalvia - Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758
Echinoidea - Clypeasteroida - Fibulariidae
Fibularia sp. Lamarck
Chondrichthyes - Myliobatiformes - Myliobatidae
Myliobatis sp. Cuvier 1816
see common names

Geography
Country:Nigeria
Coordinates: 5.6° North, 7.6° East (view map)
Paleocoordinates:0.2° South, 1.6° East
Basis of coordinate:estimated from map
Geographic resolution:local area
Time
Period:Paleogene Epoch:Eocene
Key time interval:Eocene
Age range of interval:56.00000 - 33.90000 m.y. ago
Stratigraphy
Formation:Ameki Local bed:1
Local order:bottom to top
Stratigraphic resolution:group of beds
Stratigraphy comments: This assemblage zone lies superjacent on the Callianassa-Buliminella-Paracypris assemblage zone and is about 65 m thick.
Lithology and environment
Primary lithology:very fine,gray,green poorly lithified calcareous sandstone
Secondary lithology: poorly lithified siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: 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.
Environment:transition zone/lower shoreface
Geology comments: intertidal
Taphonomy
Size of fossils:macrofossils,mesofossils,microfossils
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Also known as:Lithology and Faunal Composition of the Ostrea assemblage zone, Unit 1, Ameki Formation
Database number:46247
Authorizer:L. Ivany Enterer:P. Wall
Modifier:P. Wall Research group:marine invertebrate
Created:2005-01-09 11:08:20 Last modified:2005-01-10 10:16:29
Access level:the public Released:2005-01-09 11:08:20
Creative Commons license:CC BY
Reference information

Primary reference:

12336. 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]