Amamgbala (Cretaceous of Nigeria)

Where: Nigeria (5.8° N, 7.9° E: paleocoordinates 4.6° S, 0.9° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Nkporo Shale Formation, Maastrichtian (72.1 - 66.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Nkporo Shales. AGE: Maastrichtian, on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From near the top of the unit.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified shale

• ENVIRONMENT: Presumably an offshore siliciclastic marine facies.
• SPECIFIC LITHOLOGY: Shale. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: cast, mold/impression

Collected by Hazell, Reyment; reposited in the BMNH

• COLLECTOR: J.R.T. Hazell and R.A. Reyment. REPOSITORY: BMNH.

Primary reference: R. A. Reyment. 1955. The Cretaceous Ammonoidea of southern Nigeria and the southern Cameroons. Geological Survey of Nigeria Bulletin 25:1-112 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 82734: authorized by Austin Hendy, entered by Austin Hendy on 31.07.2008, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for Ammonoidea. NOMENCLATURE: Authoritative publication, but with somewhat antiquated nomenclature. Mostly identified to species resolution.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Sphenodiscidae
Libycoceras afikpoense
Libycoceras afikpoense Reyment 1955 ammonite
 Ammonitida - Baculitidae
Baculites cf. asper
Baculites cf. asper Morton 1830 ammonite
Gastropoda
 Cerithioidea - Turritellidae
Turritella nodosa
Turritella nodosa Roemer 1841 turret shell
Bivalvia
 Cardiida - Arcticidae
Agelasina plenodonta
Agelasina plenodonta Riedel 1933 clam
 Carditida - Carditidae
Venericardia crossensis n. sp.
Venericardia crossensis n. sp. Reyment 1955 clam