Tuma-1 Well, Lithologic Unit 2, 3445-3475 m (Cretaceous to of Nigeria)

Where: Maiduguri, Nigeria (12.1° N, 13.1° E: paleocoordinates 5.4° S, 5.3° E)

When: Kerrikerri Formation (Bornu Basin Group), Albian to Albian (113.0 - 93.9 Ma)

Environment/lithology: fluvial; lithified, graded, bioturbated, fine-grained, medium, ferruginous, sandy sandstone

• lithologic unit II is predominantly composed of sandstone, fine to granule in size, angular to rounded, moderate sorting and moderate porosity, feruginised and strongly associated with rootling. It is rarely intercalated with thin shale beds. The upper part of the sandstone body shows an upward coarsening sequence (3310m-3230m) compared to the underlying massive sandstone bed. The associated characteristics suggest a sandstone body deposited in a fluvial environment.

Size class: microfossils

Preservation: original sporopollenin

Primary reference: A. O. Ola-Buraimo and O. A. Boboye. 2011. Palynological Investigation of the Albian to Lower Cenomanian Bima Formation, Bornu Basin, Nigeria. World Applied Sciences Journal 12(7):1026-1033 [C. Jaramillo/G. Doria]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 139272: authorized by Carlos Jaramillo, entered by Gabriela Doria on 10.02.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ephedrales - Ephedraceae
Ephedripites multicostatus Brenner 1963 jointfir
 Coniferales - Cheirolepidiaceae
Classopollis sp. Pflug 1953
Classopollis brasiliensis Herngreen 1975
Afropollis jardinus
Afropollis jardinus Doyle et al. 1982
Monosulcites sp. Cookson and Couper 1953
 Gnetales -
Elaterosporites klaszii Jardiné 1967 elaterate
Verrucosisporites sp. Potonie and Kremp 1954
Tricolporites sp. Cookson 1947
 Haloragidales - Rosidae
Tricolpites sp. Couper 1953
 Euphorbiales - Dilleniidae
Tricolporopollenites sp. Thomson and Pflug 1953
Tricolporopollenites "spscl" Thomson and Pflug 1953
Triorites africaensis Jardiné and Magloire 1965
 Magnoliales - Trimeniaceae
 Buxales - Didymelaceae
 Gymnospermophyta -
Galeacornea causea Stover 1963 elaterate
Galeacornea clavis Stover 1963 elaterate
Monocolpites sp. Van der Hammen 1954
 Peridiniales - Peridiniaceae
"Senegalinium sp." = Deflandrea, Senegalinium bicavatum
"Senegalinium sp." = Deflandrea Eisenack 1938
Senegalinium bicavatum Jain and Millepied 1971
 Gonyaulacales -
Batiacasphaera sp. Drugg 1970
 Cupressales - Pinidae