Borehole 927 - Ilaro Fm: Lutetian, Nigeria

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Bendeluta conicoturrita
Rectangularca africana
Ruggierria tattami
Adegoke 1968
Sphryna itoriensis
Adegoke 1968
Sphryna tortilis
Adegoke 1968
Carcharinus nigeriensis
Adegoke 1968
Bolivinidae
Bolivina ottaensis
Adegoke 1968
Uvigerinidae
Uvigerina sp. d'Orbigny 1826
Adegoke 1968
unclassified
Bitubulogenerina circumspinosa
Adegoke 1968
Globigerinidae
Globigerina bolivariana
Adegoke 1968
Globigerina irrorata
Adegoke 1968
Globigerina lineaperta
Adegoke 1968
Globigerina soldadoensis
Adegoke 1968
Globigerina taroubaensis
Adegoke 1968
Globigerina veguaensis
Adegoke 1968
Globorotaliidae
Globorotalia aequa
Adegoke 1968
Globorotalia densa
Adegoke 1968
Globorotalia esnaensis
Adegoke 1968
Globorotalia pseudoscitula
Adegoke 1968
Globorotalia pseudotopilensis
Adegoke 1968
Globorotalia renzi
Adegoke 1968
Globorotalia tribulosa
Adegoke 1968
Globorotalia triplex
Adegoke 1968
Nodosariata - Robertinida - Ceratobuliminidae
Ceratobulimina sp. Toula 1915
Adegoke 1968
Nodosariata - Nodosariida - Nodosariidae
Robulus sp. Montfort 1808
Adegoke 1968
unclassified
Pseudohastigerina micra
Adegoke 1968
Tubothalamea - Miliolida - Hauerinidae
Quinqueloculina sp. d'Orbigny 1826
Adegoke 1968
Tubothalamea - Miliolida - Miliolidae
Sigmoilina sp. Schlumberger 1887
Adegoke 1968
Globothalamea - Rotaliida - Nonionidae
Nonion sp. Monfort 1808
Adegoke 1968
Globothalamea - Rotaliida - Discorbidae
Discorbis sp. Lamarck 1804
Adegoke 1968
Eponides africana
Adegoke 1968
Globothalamea - Rotaliida - Cibicididae
Planulina sp. d'Orbigny 1826
Adegoke 1968
Cibicides aff. yazooensis
Adegoke 1968
Truncorotaloididae
Truncorotaloides rohri
Adegoke 1968
Truncorotaloides rotundimarginata
Adegoke 1968
Chiloguembelinidae
Chiloguembelina cubensis
Adegoke 1968
Chiloguembelina martini
Adegoke 1968
Anthozoa - Scleractinia - Turbinoliidae
Turbinolia sp. Lamarck 1816
Adegoke 1968
Acipenseriformes
Cylindracanthus rectus (Agassiz 1843)
Adegoke 1968
Cylindracanthus cf. gigas (Woodward 1888)
Adegoke 1968
Actinopteri - Scombriformes - Trichiuridae
Trichiurus oshosunensis White 1926
Adegoke 1968
Actinopteri - Siluriformes - Ariidae
Arius russi White 1926
Adegoke 1968
Chondrichthyes - Myliobatiformes - Myliobatidae
Myliobatis bothridon
Myliobatis toliapicus (Agassiz 1843)
Adegoke 1968
Chondrichthyes - Squatinidae
Squatina sp. Dumeril 1806
Adegoke 1968
Chondrichthyes - Rhinopristiformes - Pristidae
Pristis lathami Galeotti 1837
Adegoke 1968
Chondrichthyes - Orectolobiformes - Ginglymostomatidae
Ginglymostoma serra (Leidy 1877)
Adegoke 1968
recombined as Nebrius serra
Ginglymostoma obliquum (Leidy 1877)
Adegoke 1968
Ginglymostoma obliquum oshosunensis
Chondrichthyes - Carcharhiniformes - Triakidae
Galeorhinus falconeri White 1956
Adegoke 1968
Chondrichthyes - Carcharhiniformes - Galeocerdidae
Galeocerdo semilevis White 1926
Adegoke 1968
Chondrichthyes - Lamniformes - Odontaspididae
Odontaspis cf. substriata (Stromer 1910)
Adegoke 1968
Odontaspis koerti (Stromer 1910)
Adegoke 1968
recombined as Brachycarcharias koerti
Odontaspis koerti and Odontaspis koerti itoriensis
Bivalvia - Nuculida - Nuculidae
Nucula costaeimbricatis Newton 1922
Bivalvia - Cardiida - Cardiidae
Fragum (Africofragum) newtoni
Bivalvia - Arcida - Glycymerididae
Africarca nigeriensis
Bivalvia - Arcida - Noetiidae
Arcopsis africana
Scaphopoda - Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758
Gastropoda - Neotaenioglossa - Calyptraeidae
Crepidula (Concavimargo) falconeri Newton 1922
Gastropoda - Turritellidae
Turritella amekiensis
Gastropoda - Pediculariidae
Eovolva nigeriensis (Newton 1922)
Gastropoda - Strombidae
Tibia bidigitata
Gastropoda - Rostellariidae
Cyrtulotibia unidigitata (Newton 1922)
Gastropoda - Neogastropoda - Pseudolividae
Pseudoliva (Buccinorbis) kitsoni Newton 1922
Adegoke 1968
Gastropoda - Neogastropoda - Turridae
Eopleurotoma nigeriensis Newton 1922
Gastropoda - Neogastropoda - Clavatulidae
Turcula (Surcula) africana Newton 1922
Gastropoda - Fasciolariidae
Sinum nigeriense
Gastropoda - Heterostropha - Architectonicidae
Architectonica (Solariaxis) amekiensis
Cephalopoda
Belosaepia sepioides
Adegoke 1968
Ostracoda - Podocopida - Leguminocythereidae
Basslerites abalidiegwuensis
Adegoke 1968
Ostracoda - Podocopida - Schizocytheridae
Paijenborchellina ijuensis
Adegoke 1968
Ostracoda - Podocopida - Bythocyprididae
Bythocypris alejo
Adegoke 1968
Ostracoda - Podocopida - Loxoconchidae
Loxoconcha lagosensis
Adegoke 1968
Ostracoda - Podocopida - Trachyleberididae
Costa dahomeyi
Adegoke 1968
Togoina attitogonensis
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]