Ouled Abdoun Basin

The Oulad Abdoun Basin (also known as the Ouled Abdoun Basin or Khouribga Basin) is a phosphate sedimentary basin located in Morocco, near the city of Khouribga. It is the largest in Morocco, comprising 44% of Morocco's phosphate reserves, and at least 26.8 billion tons of phosphate.[1][2] It is also known as an important site for vertebrate fossils, with deposits ranging from the Late Cretaceous (Cenomanian-Turonian) to the Eocene epoch (Ypresian), a period of about 25 million years.[3]

Ouled Abdoun Basin
Stratigraphic range: Cenomanian-Ypresian
~
The Oulad Abdoun and other major phosphate basins (in yellow) of Morocco
TypeGeological formation
Unit ofSedimentary Basins
Location
Coordinates32°53′N 6°55′W
RegionBéni Mellal-Khénifra, Khouribga
Country Morocco
Ouled Abdoun Basin is located in Morocco
Ouled Abdoun Basin (Morocco)

Geography

The Oulad Abdoun is located west of the Atlas Mountains, near the city of Khouribga. The Oulad Abdoun phosphate deposits encompass some 100 by 45 kilometres (62 by 28 mi), an area of 4,500 square kilometres (1,700 sq mi).[2] The Oulad Abdoun is the largest and northernmost of Morocco's major phosphate basins, which from northeast to southwest, include the Ganntour, Meskala, and Oued Eddahab (Laayoune-Baa) basins.[1][2]

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

The Oulad Abdoun Basin stretches from late Cretaceous to the Eocene, and contains abundant marine vertebrate fossils, including sharks, bony fish, turtles, crocodilians, and other reptiles, as well as sea birds and a small number of terrestrial mammals.[3][4]

Bony fish
Bony fish from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Enchodus E. libycus Maastrichtian An enchodontid aulopiform.
Enchodus
E. bursauxi Maastrichtian
E. elegans Maastrichtian
Pycnodontidae Indeterminate Maastrichtian
Pseudoegertonia P. sp. Maastrichtian
Stephanodus S. libycus Maastrichtian
Stratodus S. apicalis Maastrichtian An alepisauroform.
Stratodus

Sharks
Sharks from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Abdounia[5] A. africana Selandian A requiem shark.
Casieria C. maghrebiana Selandian
Chiloscyllium C. salvani. Selandian A carpet shark.
Cretalamna C. appendiculata Maastrichtian
Cretalamna
C. maroccana Maastrichtian
Delpitoscyllium D. africanum Selandian
Eostegostoma E. sp. Selandian A carpet shark.
Foumtizia F. abdouni Selandian
Galeorhinus G. mesetaensis Selandian
Ginglymostoma G. chenanei Selandian
G. khouribgaense Selandian
Hologinglymostoma H. jaegeri Selandian
Khouribgaleus K. gomphorhiza Selandian
Metlaouia M. delpiti Selandian
Microscyliorhinus M. simplex Selandian
Palaeogaleus P. larachei Selandian
Palaeorhincodon P. daouii Selandian A carpet shark.
Porodermoides P. spanios Selandian
Premontreia P. peypouqueti Selandian
P. subulidens Selandian
Scyliorhinus S. ptychtus Selandian
S. entomodon Selandian
S. sulcidens Selandian
Serratolamna S. serrata Maastrichtian
Serratolamna teeth
S. khderii Maastrichtian
Squalicorax S. pristodontus Maastrichtian
Squalicorax
S. bassanii Maastrichtian
S. africanus Maastrichtian
S. microserratus Maastrichtian
S. benguerirensis Maastrichtian
Triakis T. antunesi Selandian

Other Cartilaginous Fish
Other Cartilaginous Fish from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Archaemanta A. priemi Selandian A ray.
Burnhamia B. cf. davisi Selandian A devil ray
Coupatezia C. larivei Selandian A ray.
C. fallax Maastrichtian
C. elevata Maastrichtian
Dasyatis D. ponsi Selandian A stringray.
Delpitia D. reticulata Selandian A ray.
Gymnura G. delpiti Selandian A ray.
Gymnura
Heterobatis H. talbaouii Selandian A ray.
Heterotorpedo H. brahimi Selandian A ray.
Hypolophodon H. sp. Selandian A ray.
Rhombodus R. binkhorsti Maastrichtian A ray.
Rhombodus spines
R. microdus Maastrichtian
R. meridionalis Maastrichtian
Schizorhiza S. stromeri Maastrichtian A sclerorhynchoid skate which resembled a sawfish.
Schizorhiza

Crocodylomorphs
Crocodylomorphs from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Arambourgisuchus[6] A. khouribgaensis Thanetian A dyrosaurid.
Arambourgisuchus
Atlantosuchus A. coupatezi Danian A dyrosaurid.
Chenanisuchus C. lateroculi Thanetian The most basal known dyrosaurid.
Chenanisuchus
Dyrosaurus P. maghribensis Ypresian A dyrosaur.
Dyrosaurus
Maroccosuchus[7] M. zennaroi Ypresian A tomistomine crocodylian.
Ocepesuchus[8] O. eoafricanus Maastrichtian A gavialoid crocodylian.

Lepidosaurs
Lepidosaurs from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Mosasaurus M. beaugei[9] Maastrichtian A large mosasaurine mosasaur.
Mosasaurus
Eremiasaurus E. heterodontus Maastrichtian A mosasaurine mosasaur with unusual cutting dentition.
Halisaurus H. arambourgi Maastrichtian A halisaurine mosasaur.
Halisaurus
Globidens G. phosphaticus Maastrichtian A mosasaurine mosasaur with specialized crushing teeth.
Globidens
G. simplex Maastrichtian
G. aegyptiacus Maastrichtian Now referred to its own genus, Igdamanosaurus.
Igdamanosaurus I. aegyptiacus Maastrichtian
Carinodens C. minalmamar Maastrichtian A small mosasaurine mosasaur with crushing teeth.
Carinodens
Platecarpus P. ptychodon Maastrichtian A nomen dubium. Now referred to its own genus, Gavialimimus.
Gavialimimus[10] G. almaghribensis Maastrichtian An unusual longirostrine plioplatecarpine mosasaur.
Prognathodon P. currii Maastrichtian A large mosasaurine mosasaur.
Prognathodon
P. giganteus Maastrichtian
Thalassotitan[11] T. atrox Maastrichtian A large-bodied mosasaurine with powerful jaws, similar to P. currii.
Thalassotitan
Pluridens[12] P. serpentis Maastrichtian A large halisaurine mosasaur, also known from Niger and Nigeria.
Pluridens
Xenodens[13] X. calminechari Maastrichtian A small mosasaurine mosasaur with unusual, shark-like teeth.
Xenodens
Pachyvaranus P. crassispondylus Maastrichtian A pachyvaranid
Palaeophis[14] P. maghrebianus Ypresian A palaeophiid marine snake.
Palaeophis

Plesiosaurs
Plesiosaurs from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Zarafasaura Z. oceanis Maastrichtian An elasmosaurid plesiosaur with an unusually short skull.
Zarafasaura

Turtles
Turtles from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Alienochelys[15] A. selloumi Maastrichtian A sea turtle with crushing jaws.
Alienochelys
Araiochelys[16] A. hirayamai
Argillochelys[17] A. africana Ypresian A pancheloniid sea turtle.
Argillochelys
Bothremys[16] B. kellyi Danian-Thanetian
B. maghrebiana
Brachyopsemys B. tingitana Danian A sandownid sea turtle
Euclastes E. wielandi Danian
Euclastes
Labrostochelys[16] L. galkini Danian
Ocepechelon[18] O. bouyai Maastrichtian A giant protostegid sea turtle with an unusual pipette-like snout.
Ocepechelon
Puppigerus P. camperi Ypresian
Rhothonemys[16] R. brinkmani Danian
Tasbacka T. ouledabdounensis Danian
Tasbacka
Taphrosphys T. ippolitoi Danian
Ummulisani U. rutgersensis Ypresian

Pterosaurs
Pterosaurs from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Alcione[19] A. elainus Maastrichtian A nyctosaurid which shows possible adaptations towards diving behaviour.
Alcione
Barbaridactylus B. grandis Maastrichtian A nyctosaurid.
Simurghia S. robusta Maastrichtian A nyctosaurid related to Alcione.
Phosphatodraco P. mauritanicus Maastrichtian An azhdarchid.
cf Arambourgiania A. sp? Maastrichtian A giant azhdarchid, may belong to the Jordanian taxon Arambourgiania.
Arambourgiania
Azhdarchidae Indet. Maastrichtian A new taxon, currently unnamed.
Tethydraco T. regalis Maastrichtian A pterosaur of debated affinity; may be an azhdarchid or a pteranodontid.
Tethydraco

Dinosaurs

Bird fossils are common in the Basin, which includes the oldest birds in Africa.[4] At least three orders and several families of sea birds are represented, including Procellariiformes (albatrosses and petrels, fossils assignable to Diomedeidae and Procellariidae), Pelecaniformes (pelicans and allies, fossils assignable to Phaethontidae, Prophaethontidae, Fregatidae and Pelagornithidae), and Anseriformes (waterfowl, including fossil Presbyornithidae).[4]

Dinosaurs from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Ajnabia[20] A. odysseus Maastrichtian A small lambeosaurine hadrosaur; the first known from Africa.
Ajnabia Size Chart
Chenanisaurus[21] C. barbaricus Maastrichtian A large abelisaurid theropod.
Chenanisaurus
Titanosauria Indet. Maastrichtian A new taxon, currently unnamed.
Dasornis D. tolapica Selandian A pelagornithid, or pseudotooth bird.
Dasornis
D. emuinus Ypresian
Lithoptila[22] L. abdounensis Thanetian A seabird related to modern tropicbirds.

Mammals
Mammals from the Khouribga Phosphates
GenusSpeciesLocationTimeMaterialNotesImages
Abdounodus[23] A. hamdii Thanetian-Ypresian
Daouitherium[24] D. rebouli Ypresian An early proboscidean.
Eritherium[25] E. azzouzorum Thanetian An early proboscidean.
Ocepeia[23] O. daouiensis Selandian
Ocepeia
O. grandis Thanetian
Phosphatherium P. escuilliei Selandian An early proboscidean.
Boualitomus B. marocanensis Selandian A hyaenodont.
Lahimia[26] L. selloumi Selandian A hyaenodont.
Stylolophus[27] S. minor Ypresian An embrithopod.
S. major Ypresian

See also

References
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