Borehole 927 - Ilaro Fm: Lutetian, Nigeria
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Bendeluta conicoturrita
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Rectangularca africana
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Ruggierria tattami
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Adegoke 1968 | |||||||||
Sphryna itoriensis
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Adegoke 1968 | |||||||||
Sphryna tortilis
|
Adegoke 1968 | |||||||||
Carcharinus nigeriensis
|
Adegoke 1968 | |||||||||
Bolivinidae
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Bolivina ottaensis
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Adegoke 1968 | |||||||||
Uvigerinidae
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Uvigerina sp.
d'Orbigny 1826
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Adegoke 1968 | |||||||||
unclassified
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Bitubulogenerina circumspinosa
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Adegoke 1968 | |||||||||
Globigerinidae
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Globigerina bolivariana
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Adegoke 1968 | |||||||||
Globigerina irrorata
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Adegoke 1968 | |||||||||
Globigerina lineaperta
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Adegoke 1968 | |||||||||
Globigerina soldadoensis
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Adegoke 1968 | |||||||||
Globigerina taroubaensis
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Adegoke 1968 | |||||||||
Globigerina veguaensis
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Adegoke 1968 | |||||||||
Globorotaliidae
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Globorotalia aequa
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Adegoke 1968 | |||||||||
Globorotalia densa
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Adegoke 1968 | |||||||||
Globorotalia esnaensis
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Adegoke 1968 | |||||||||
Globorotalia pseudoscitula
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Adegoke 1968 | |||||||||
Globorotalia pseudotopilensis
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Adegoke 1968 | |||||||||
Globorotalia renzi
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Adegoke 1968 | |||||||||
Globorotalia tribulosa
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Adegoke 1968 | |||||||||
Globorotalia triplex
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Adegoke 1968 | |||||||||
Nodosariata
- Robertinida
- Ceratobuliminidae
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Ceratobulimina sp.
Toula 1915
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Adegoke 1968 | |||||||||
Nodosariata
- Nodosariida
- Nodosariidae
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Robulus sp.
Montfort 1808
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Adegoke 1968 | |||||||||
unclassified
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Pseudohastigerina micra
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Adegoke 1968 | |||||||||
Tubothalamea
- Miliolida
- Hauerinidae
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Quinqueloculina sp.
d'Orbigny 1826
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Adegoke 1968 | |||||||||
Tubothalamea
- Miliolida
- Miliolidae
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Sigmoilina sp.
Schlumberger 1887
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Adegoke 1968 | |||||||||
Globothalamea
- Rotaliida
- Nonionidae
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Nonion sp.
Monfort 1808
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Adegoke 1968 | |||||||||
Globothalamea
- Rotaliida
- Discorbidae
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Discorbis sp.
Lamarck 1804
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Adegoke 1968 | |||||||||
Eponides africana
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Adegoke 1968 | |||||||||
Globothalamea
- Rotaliida
- Cibicididae
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Planulina sp.
d'Orbigny 1826
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Adegoke 1968 | |||||||||
Cibicides aff. yazooensis
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Adegoke 1968 | |||||||||
Truncorotaloididae
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Truncorotaloides rohri
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Adegoke 1968 | |||||||||
Truncorotaloides rotundimarginata
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Adegoke 1968 | |||||||||
Chiloguembelinidae
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Chiloguembelina cubensis
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Adegoke 1968 | |||||||||
Chiloguembelina martini
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Adegoke 1968 | |||||||||
Anthozoa
- Scleractinia
- Turbinoliidae
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Turbinolia sp.
Lamarck 1816
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Adegoke 1968 | |||||||||
Acipenseriformes
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Cylindracanthus rectus
(Agassiz 1843)
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Adegoke 1968 | |||||||||
Cylindracanthus cf. gigas
(Woodward 1888)
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Adegoke 1968 | |||||||||
Actinopteri
- Scombriformes
- Trichiuridae
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Trichiurus oshosunensis
White 1926
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Adegoke 1968 | |||||||||
Actinopteri
- Siluriformes
- Ariidae
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Arius russi
White 1926
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Adegoke 1968 | |||||||||
Chondrichthyes
- Myliobatiformes
- Myliobatidae
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Myliobatis bothridon
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Myliobatis toliapicus
(Agassiz 1843)
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Adegoke 1968 | |||||||||
Chondrichthyes
- Squatinidae
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Squatina sp.
Dumeril 1806
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Adegoke 1968 | |||||||||
Chondrichthyes
- Rhinopristiformes
- Pristidae
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Pristis lathami
Galeotti 1837
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Adegoke 1968 | |||||||||
Chondrichthyes
- Orectolobiformes
- Ginglymostomatidae
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Ginglymostoma serra
(Leidy 1877)
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Adegoke 1968 | |||||||||
recombined as Nebrius serra | ||||||||||
Ginglymostoma obliquum
(Leidy 1877)
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Adegoke 1968 | |||||||||
Ginglymostoma obliquum oshosunensis | ||||||||||
Chondrichthyes
- Carcharhiniformes
- Triakidae
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Galeorhinus falconeri
White 1956
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Adegoke 1968 | |||||||||
Chondrichthyes
- Carcharhiniformes
- Galeocerdidae
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Galeocerdo semilevis
White 1926
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Adegoke 1968 | |||||||||
Chondrichthyes
- Lamniformes
- Odontaspididae
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Odontaspis cf. substriata
(Stromer 1910)
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Adegoke 1968 | |||||||||
Odontaspis koerti
(Stromer 1910)
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Adegoke 1968 | |||||||||
recombined as Brachycarcharias koerti | ||||||||||
Odontaspis koerti and Odontaspis koerti itoriensis | ||||||||||
Bivalvia
- Nuculida
- Nuculidae
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Nucula costaeimbricatis
Newton 1922
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Bivalvia
- Cardiida
- Cardiidae
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Fragum (Africofragum) newtoni
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Bivalvia
- Arcida
- Glycymerididae
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Africarca nigeriensis
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Bivalvia
- Arcida
- Noetiidae
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Arcopsis africana
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Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium sp.
Linnaeus 1758
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Gastropoda
- Neotaenioglossa
- Calyptraeidae
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Crepidula (Concavimargo) falconeri
Newton 1922
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Gastropoda
- Turritellidae
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Turritella amekiensis
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Gastropoda
- Pediculariidae
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Eovolva nigeriensis
(Newton 1922)
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Gastropoda
- Strombidae
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Tibia bidigitata
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Gastropoda
- Rostellariidae
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Cyrtulotibia unidigitata
(Newton 1922)
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Gastropoda
- Neogastropoda
- Pseudolividae
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Pseudoliva (Buccinorbis) kitsoni
Newton 1922
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Adegoke 1968 | |||||||||
Gastropoda
- Neogastropoda
- Turridae
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Eopleurotoma nigeriensis
Newton 1922
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Gastropoda
- Neogastropoda
- Clavatulidae
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Turcula (Surcula) africana
Newton 1922
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Gastropoda
- Fasciolariidae
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Sinum nigeriense
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Gastropoda
- Heterostropha
- Architectonicidae
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Architectonica (Solariaxis) amekiensis
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Cephalopoda
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Belosaepia sepioides
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Adegoke 1968 | |||||||||
Ostracoda
- Podocopida
- Leguminocythereidae
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Basslerites abalidiegwuensis
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Adegoke 1968 | |||||||||
Ostracoda
- Podocopida
- Schizocytheridae
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Paijenborchellina ijuensis
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Adegoke 1968 | |||||||||
Ostracoda
- Podocopida
- Bythocyprididae
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Bythocypris alejo
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Adegoke 1968 | |||||||||
Ostracoda
- Podocopida
- Loxoconchidae
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Loxoconcha lagosensis
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Adegoke 1968 | |||||||||
Ostracoda
- Podocopida
- Trachyleberididae
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Costa dahomeyi
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Adegoke 1968 | |||||||||
Togoina attitogonensis
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Adegoke 1968 | |||||||||
see common names |
Geography
Country: | Nigeria |
Coordinates: | 6.7° North, 3.2° East (view map) |
Paleocoordinates: | 1.4° North, 2.6° West |
Basis of coordinate: | based on nearby landmark |
Altitude: | -370 feet |
Geographic resolution: | small collection |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Lutetian | 10 m.y. bin: | Cenozoic 2 |
Key time interval: | Lutetian | ||
Age range of interval: | 47.80000 - 41.20000 m.y. ago |
Stratigraphy
Formation: | Ilaro | ||||
Local section: | Borehole 927 | Local bed: | 370 | ||
Local order: | top to bottom | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Ilaro Fm, which overlies the Ewekoro Fm (Paleocene) and is unconformably overlain by Oligocene-Pleistocene coastal plain sands. THICKNESS: From single horizon of unknown thickness, within formation that is approximately 220 ft thick. AGE: Probably Middle Eocene, but debated. A fish fauna (White 1926, 1955) suggests Middle Eocene; mollusca based on similarity with regional assemblages of Newton (1922) and Eames (1957) suggests a Late Eocene age; Berggren (1960) however suggests a Lutetian (Middle Eocene) age on the basis of foraminifera; Reyment (1963), suggests Early Eocene. An intermediate age of Lutetian is assigned for the collection by the enterer. STRATIGRAPHIC POSITION: From 370 ft within borehole, which lies 135 ft below the top of the formation. |
Lithology and environment
Primary lithology: | "shale" |
Includes fossils? | Y |
Lithology description: SPECIFIC LITHOLOGY: Shales, silts, and fine-grained argillaceous sands. LITHIFICATION: Unknown. | |
Environment: | offshore |
Geology comments: ENVIRONMENT: Not reported in text, but apparently siliciclastic and relatively offshore. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | field collection |
Reason for describing collection: | biostratigraphic analysis |
Collection method comments: COLLECTOR: Not reported, but presumably the Geological Survey of Nigeria. REPOSITORY: Not stated, but presumably the Geological Survey of Nigeria of the BMNH. | |
Taxonomic list comments:COVERAGE: Exhaustive for gastropoda, bivalvia, and scaphopoda. NOMENCLATURE: Somewhat antiquated nomenclature from non-authoritative publication, but using subgenus and species-resolution assignments. Identified by Reyment (1952, unpublished report). |
Metadata
Database number: | 77257 | ||
Authorizer: | A. Hendy, A. Miller | Enterer: | A. Hendy, J. Sessa |
Modifier: | M. Clapham | Research group: | marine invertebrate |
Created: | 2008-01-07 18:38:39 | Last modified: | 2020-05-02 10:18:46 |
Access level: | authorizer only | Released: | 2009-01-07 18:38:39 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
26161. | H. A. Jones and R. D. Hockey. 1964. The geology of part of south-western Nigeria. Geological Survey of Nigeria Bulletin 31:1-101 [A. Hendy/A. Hendy/A. Hendy] |
Secondary references:
27147 | O.S. Adegoke. 1968. Eocene stratigraphy of southern Nigeria. Memoires du Bureau de Recherches Geologiques et Minieres 69:23-47 [A. Miller/J. Sessa] |