Ameki Railway - Cutting #6, southern Nigeria (Eocene of Nigeria)

Also known as Cutting #6

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 #6. 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 51240: 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.
Bivalvia
 Arcida - Arcidae
Fossularca africana Newton 1922 ark
Striarca africana Newton 1922 clam
"Anadara nigeriensis" = Protonoetia nigeriensis Newton 1922 clam
 Arcida - Glycymerididae
Glycymeris nigeriensis Newton 1922 clam
 Ostreida - Ostreidae
Ostrea cf. marginidentata Wood 1861 oyster
 Carditida - Carditidae
Cardita triparticostata Newton 1922 clam
Cardita costaenodulosis Newton 1922 clam
 Pholadida - Raetomyidae
Raetomya schweinfurthi Mayer-Eymar 1887 clam
 Pholadida - Corbulidae
"Corbula rugosa" = Notocorbula rugosa
"Corbula rugosa" = Notocorbula rugosa Lamarck 1806 clam
 Cardiida - Mactridae
"Mactra semisulcata" = Spisula semisulcata
"Mactra semisulcata" = Spisula semisulcata Lamarck 1805 clam
 Cardiida - Veneridae
Callista elongatotrigona Newton 1922 venus clam
Callista kitsoni Newton 1922 venus clam
Cordiopsis incrassata Nyst 1836 venus clam
Sinodia hewardbelli Newton 1922 venus clam
Listed as "Sinodia heward-belli"
 Cardiida - Tellinidae
Peronaea nigeriensis Newton 1922 tellin clam
 Cardiida - Cardiidae
Cardium cf. obliquum Lamarck 1805 cockle
 Lucinida - Lucinidae
Phacoides eaglesomei Newton 1922 clam
Phacoides subrhomboidalis Newton 1922 clam
Divaricella oppenheimi Newton 1922 clam
Gastropoda
 Ptenoglossa - Epitoniidae
Acrilla cf. affinis Deshayes 1861 wentletrap
 Neogastropoda - Buccinidae
Liomesus africanus Newton 1922 true whelk
Cominella douvillei Newton 1922 true whelk
Hilda turriculata Newton 1922 true whelk
Strepsidura spirata Newton 1922 true whelk
Buccinorbis kitsoni Newton 1922 true whelk
Janiopsis nigeriensis Newton 1922 true whelk
 Neogastropoda - Melongenidae
Cornulina minax Solander 1766 snail
 Neogastropoda - Fasciolariidae
"Rhopalithes africanus" = Africolithes africanus Newton 1922 snail
Bulbifusus nigeriensis Newton 1922 snail
 Neogastropoda - Cancellariidae
Trigonostoma decorara Newton 1922 snail
Bonellitia cf. evulsa Solander 1766 snail
 Neogastropoda - Volutidae
Volutospina multispinosa Newton 1922 volute
Volutospina conicoturrita Newton 1922 volute
Athleta lugardi Newton 1922 volute
 Neogastropoda - Muricidae
Poirieria cf. calcitrapa Lamarck 1803 murex snail
 Neogastropoda - Turridae
Surcula africana Newton 1922 turrid
Surcula ingens Mayer-Eymar 1895 turrid
 Neogastropoda - Conidae
Conospirus cf. parisiensis Deshayes 1835 cone shell
 Stromboidea - Rostellariidae
"Semiterebellum elongatum" = Africoterebellum elongatum, "Rostellaria unidigitata" = Cyrtulotibia unidigitata, "Semiterebellum suturocostatum" = Amekichilus suturocostatum
"Semiterebellum elongatum" = Africoterebellum elongatum Newton 1922 snail
"Rostellaria unidigitata" = Cyrtulotibia unidigitata Newton 1922 snail
"Semiterebellum suturocostatum" = Amekichilus suturocostatum Newton 1922 snail
 Naticoidea - Naticidae
Sinum africanum Newton 1922 moon snail
Sinum cf. clathratum Gmelin 1790 moon snail
Neverita cf. calvimontana Deshayes 1864 moon snail
 Cypraeoidea - Pediculariidae
"Amphiperas nigeriensis" = Eovolva nigeriensis
"Amphiperas nigeriensis" = Eovolva nigeriensis Newton 1922 snail
 Cypraeoidea - Eocypraeidae
Cypraea cf. bowerbanki Sowerby 1850 snail
 Calyptraeoidea - Calyptraeidae
Crepidula falconeri Newton 1922 slipper shell
 Xenophoroidea - Xenophoridae
Tugurium nigeriense Newton 1922 carrier shell
 Sorbeoconcha - Potamididae
Exechestoma cossmani Newton 1922 horn snail
 Sorbeoconcha - Turritellidae
Turritella mauryana, "Turritella cf. sulcifera" = Ispharina sulcifera
Turritella mauryana Newton 1922 turret shell
"Turritella cf. sulcifera" = Ispharina sulcifera Deshayes 1832 turret shell
 Architectonicoidea - Architectonicidae
Solariaxis cf. canaliculata Lamarck 1804 sundial
Solariaxis cf. spectabilis Sowerby 1850 sundial
Stellaxis bicingulata Newton 1922 sundial
Trivelina sphenarium
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