Tuma-1 Well, All lithological units (Cretaceous to of Nigeria)

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

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

Environment/lithology: lacustrine; lithified, graded, bioturbated, fine-grained, medium, ferruginous, argillaceous sandstone and lithified, fine-grained, gypsiferous, gray, argillaceous shale

• Lithologic unit III (3510-3620 m) heterolithic sand varying from sand, shale, gypsum to clay. The sandstone has the same textural properties to the massive sandstone body overlying it. The shale is dark grey in colour, fissile and moderately associated with about 30% gypsum content. However, the deepest sediment that probably overly the basement is sandy with minor clay (15%) content. Grain sizes vary from fine to granule, angular to rounded and generally moderately sorted.

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 139281: authorized by Carlos Jaramillo, entered by Gabriela Doria on 10.02.2013

Creative Commons license: CC BY (attribution)

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