Ameki Railway - Cutting #12, southern Nigeria (Eocene of Nigeria)

Also known as Cutting #12

Where: Nigeria (5.0° N, 7.5° E: paleocoordinates 0.7° S, 1.4° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Ameki Formation (Bende-Ameki Group), Lutetian (47.8 - 41.3 Ma)

• Cutting #12. No stratigraphic value can be assigned to cutting numbering. Collections presumably originate from the Ameki Fm (not stated in text, but highly likely based on age and geography). Newton states an upper Lutetian age. This has not be confirmed against publications of Arua and other Ameke Fm collections DO NOT state an age finer than "Eocene". This needs to be rectified as these will be orphaned in current binning scheme. Uhen's Ameki Fm collections state "Middle Eocene", which while encompassing the Lutetian will also be orphaned.

• bed-level stratigraphic resolution

Environment/lithology: estuary or bay; poorly lithified, concretionary, carbonaceous shale and concretionary, carbonaceous claystone

• Described as estuarine facies
• Facies may include: estuarine shales, clays and marls, with septarian nodules and pieces of coal and resin.

Size class: macrofossils

Collection methods: Collected by Sir Frederick Lugard, Sir J. Eaglesome, A. Kitson, W. Bell over several occasions, but with consistency in original of collections.

Primary reference: R. B. Newton. 1922. Eocene Mollusca from Nigeria. Geological Survey of Nigeria Bulletin 3 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51243: authorized by Austin Hendy, entered by Austin Hendy on 01.06.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Obviously contains antiquated taxonomy. Will vett taxonomy according to that presented by Arua et al. (1987, 1988, 1989) - A. Hendy.
Gastropoda
 Neotaenioglossa - Calyptraeidae
Crepidula falconeri Newton 1922 slipper shell
 Cerithioidea - Turritellidae
Turritella mauryana, "Turritella cf. sulcifera" = Ispharina sulcifera
Turritella mauryana Newton 1922 turret shell
"Turritella cf. sulcifera" = Ispharina sulcifera Deshayes 1832 turret shell
 Sorbeoconcha - Strombidae
Rostellaria bidigitata Newton 1922 true conch
 Sorbeoconcha - Rostellariidae
"Rostellaria unidigitata" = Cyrtulotibia unidigitata, "Semiterebellum elongatum" = Africoterebellum elongatum, "Semiterebellum suturocostatum" = Amekichilus suturocostatum
"Rostellaria unidigitata" = Cyrtulotibia unidigitata Newton 1922 snail
"Semiterebellum elongatum" = Africoterebellum elongatum Newton 1922 snail
"Semiterebellum suturocostatum" = Amekichilus suturocostatum Newton 1922 snail
 Neogastropoda - Buccinidae
Hilda turriculata Newton 1922 true whelk
Strepsidura spirata Newton 1922 true whelk
Janiopsis nigeriensis Newton 1922 true whelk
 Neogastropoda - Clavatulidae
Surcula africana Newton 1922 snail
 Neogastropoda - Conidae
Conospirus cf. parisiensis Deshayes 1835 cone shell
 Neogastropoda - Pseudolividae
Buccinorbis kitsoni Newton 1922 snail
 Neogastropoda - Muricidae
Poirieria cf. calcitrapa Lamarck 1803 murex snail
 Neogastropoda - Volutidae
Volutospina conicoturrita Newton 1922 volute
Volutospina multispinosa Newton 1922 volute
Athleta lugardi Newton 1922 volute
 Neogastropoda - Cancellariidae
Bonellitia cf. evulsa Solander 1766 snail
Cancellaria multiplicis Newton 1922 snail
 Sorbeoconcha - Pediculariidae
"Amphiperas nigeriensis" = Eovolva nigeriensis
"Amphiperas nigeriensis" = Eovolva nigeriensis Newton 1922 snail
 Sorbeoconcha - Xenophoridae
Tugurium nigeriense Newton 1922 carrier shell
 Sorbeoconcha - Naticidae
Neverita cf. calvimontana Deshayes 1864 moon snail
Sinum cf. clathratum Gmelin 1790 moon snail
 Heterostropha - Architectonicidae
Stellaxis bicingulata Newton 1922 sundial
Solariaxis cf. spectabilis Sowerby 1850 sundial
Bivalvia
 Arcida - Arcidae
Striarca africana Newton 1922 clam
"Anadara nigeriensis" = Protonoetia nigeriensis Newton 1922 clam
Fossularca africana Newton 1922 ark
 Arcida - Glycymerididae
Glycymeris nigeriensis Newton 1922 clam
 Pectinida - Plicatulidae
Plicatula polymorpha Bellardi 1854 scallop
 Lucinida - Lucinidae
Phacoides eaglesomei Newton 1922 clam
 Cardiida - Veneridae
Callista kitsoni Newton 1922 venus clam
Cordiopsis incrassata Nyst 1836 venus clam
 Carditida - Carditidae
Cardita costaenodulosis Newton 1922 clam