Koum Formation

Last updated
Koum Formation
Stratigraphic range: Aptian-Albian
~125–100  Ma
Type Geological formation
Sub-unitsMbissirri Member, Grés de Gaba Member
Lithology
Primary Sandstone
Other Claystone, siltstone, conglomerate
Location
Coordinates 8°18′N14°30′E / 8.3°N 14.5°E / 8.3; 14.5
Approximate paleocoordinates 8°06′S5°00′E / 8.1°S 5.0°E / -8.1; 5.0
Region Nord
CountryFlag of Cameroon.svg  Cameroon
Extent Koum Basin
Cameroon physical map.svg
Green pog.svg
Green pog.svg
Green pog.svg
Koum Formation (Cameroon)

The Koum Formation is a geological formation in the North Province of Cameroon, western Africa.

Contents

Its strata date back to the Aptian and Albian stages of the Early Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation. [1]

Fossil content

The following fossils have been found in the formation: [1]

Color key
Taxon Reclassified taxonTaxon falsely reported as presentDubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Sauropods

Sauropods of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Lithostrotia Indet.Indeterminate
Rebbachisauridae Indet.Indeterminate

Theropods

Theropods of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Abelisauridae Indet.Indeterminate
Baryonychinae Indet. [2] Indeterminate
Caenagnathidae Indet.Indeterminate
Carcharodontosauridae Indet.Indeterminate
Noasauridae Indet.Ineterminate
Therizinosauridae Indet.Indeterminate

Ornithopods

Ornithopods of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Dryosauridae Indet.Indeterminate
Ouranosaurus [3] O. nigeriensisA sail-backed hadrosauriform iguanodontian
Polacanthinae Indet.Indeterminate
Rhabdodontomorpha Indet.Indeterminate
Stegosauridae Indet.Indeterminate

Pterosaurs

Pterosaurs of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Anhangueridae Indet.Indeterminate

Squamates

Squamates of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Simoliophiidae Indet.Indeterminate

Plesiosaurs

Plesiosaurs of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Leptocleidus L. sp.a leptocleidid plesiosaur

Turtles

Turtles of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Bothremydidae Indet.Indeterminate

Amphibians

Amphibians of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Chigutisauridae Indet.Indeterminate
Pipidae Indet.Indeterminate

Crocodyliformes

Crocodyliformes of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Araripesuchus A. sp.A uruguaysuchid notosuchian

Mammals

Mammals of the Koum Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Abelodon A. abeliA peramurid mammal

Fish

Cartilaginous fish

Cartilaginous fish of the Feliz Deserto Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Hybodus H. sp.A hybodontid shark
Onchopristis O. numidaA giant sawskate

Lobbed-finned fish

Lobbed-finned fish of the Feliz Deserto Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Ceratodus C. sp.A ceradodontid lungfish
Mawsonia M. gigasA mawsoniid coelacanth

Ray-finned fish

Ray-finned fish of the Feliz Deserto Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Atractosteus A. africanusA gar
Lepidotes L. sp.A lepidotid fish

See also

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References

  1. 1 2 Weishampel et al., 2004, pp.571-573
  2. Bertin, Tor (2010). "A Catalogue of Material and Review of the Spinosauridae". PalArch's Journal of Vertebrate Palaeontology. 7 (4): 01–39. ISSN   1567-2158.
  3. Congleton, J.D. (1990). "Vertebrate Paleontology of the Koum Basin, Northern Cameroon, and Archosaurian Paleobiogeography in the Early Cretaceous". Department of Geology, Southern Methodist University, Dallas.

Bibliography

Further reading