Aridal Formation

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Aridal Formation
Stratigraphic range: Middle Eocene, LutetianPriabonian
Chrysocetus fouadassii cast (cropped).jpg
Type Geological formation
Lithology
Other sandstone, marl
Location
Country Morocco

The Aridal Formation in the Sahara Desert of southwestern Morocco is a fossil formation with rocks dating to the Lutetian - Priabonian (47.8 - 33.9 million years ago), preserving a middle Eocene shallow coastal environment. [1]

Contents

The formation represents the world's richest Bartonian archaic whale assemblage, including protocetids and basilosaurids. [2]

Paleobiota

Birds

Includes the earliest occurrence of the genus Pelagornis, extending its fossil record back by at least 10 million years. [2]

TaxaRock UnitAgeImage
Pelagornis sp.Gueran Bartonian Pelagornis sandersi.png
Pelagornithidae indet.El Breij Unit II Bartonian

Mammals

Alongside a rich assemblage of archaic whale taxa including two additional unnamed protocetid species, [3] there are also possible remains of the earliest occurrence of Barytherium. [4]

TaxaRock UnitAgeImage
Pappocetus lugardi Gueran, [3]

Sabkha of Lebreij

Bartonian Andrews-1920-Plate-1-Pappocetus-ligardi.JPEG
Eocetus schweinfurthi Gueran, [3]

El Breij Unit II,

El Breij Unit III

Bartonian
Chrysocetus fouadassii Gueran [3] Bartonian Chrysocetus fouadassii cast 2.jpg
Platyosphys aithai Gueran [3] Bartonian Pachycetus paulsoni.png
? Barytherium sp.Gueran [4] Bartonian Barytherium graveDB1.jpg

Reptiles

There are at least three indeterminate species of turtles: two marine cryptodires, a cheloniid, a dermochelyid, and a possible littoral pleurodire. Two species of longirostrine crocodylians are present, including a gavialoid similar to Eogavialis africanum (which is typically known from younger strata), and one too fragmentary to identify beyond being a crocodyliform. [2]

TaxaRock UnitAgeImage
Pterosphenus schweinfurthi Gueran Bartonian Pterosphenus.jpg
Palaeophis africanus El Breij, Unit I Lutetian
Palaeophiidae indet.Sabkha of Lebreij Bartonian
Cordichelys antiqua El Breij, Unit I Lutetian
Cheloniidae indet.Gueran Bartonian
Dermochelyidae indet.Gueran Bartonian
Pleurodira indet.Gueran Bartonian
Gavialoidea indet.Gueran Bartonian
Crocodyliformes indet.Gueran Bartonian
Crocodylia indet.El Breij Unit I,

Sabkha of Lebreij

Lutetian

Bartonian

Cartilaginous Fish

TaxaRock UnitAgeImage
Galeocerdo eaglesomei Gueran Bartonian
Pristis lathami Gueran Bartonian Pristidae - Pristis lathami.JPG
Propristis schweinfurthi Gueran Bartonian Die stamme der wirbeltiere (1919) (20937469632) (cropped).jpg
Macrorhizodus praecursor Gueran Bartonian Macrorhizodus praecursor.jpg
Hemipristis curvatus Gueran Bartonian
Carcharias koerti Gueran Bartonian
Otodus cf. sokolowi Gueran Bartonian
Tethylamna cf. twiggsensis Gueran Bartonian
Carcharhinus sp.Gueran Bartonian
Abdounia sp.Gueran Bartonian
Physogaleus sp.Gueran Bartonian

Bony Fish

TaxaRock UnitAgeImage
Cylindracanthus sp.Gueran,

El Breij Unit I

Bartonian,

Lutetian

Cylindracanthus rectus.jpg

References

  1. "The Paleobiology Database Navigator". The Paleobiology Database. Retrieved 5 September 2024.
  2. 1 2 3 Zouhri, Samir; Gingerich, Philip D.; Khalloufi, Bouziane; Bourdon, Estelle; Adnet, Sylvain; Jouve, Stéphane; Elboudali, Najia; Amane, Ayoub; Rage, Jean-Claude; Tabuce, Rodolphe; De Broin, France De Lapparent (11 March 2021). "Middle Eocene vertebrate fauna from the Aridal Formation, Sabkha of Gueran, southwestern Morocco". Geodiversitas. 43 (5). doi:10.5252/geodiversitas2021v43a5. ISSN   1280-9659.
  3. 1 2 3 4 5 Gingerich, Philip D.; Zouhri, Samir (November 2015). "New fauna of archaeocete whales (Mammalia, Cetacea) from the Bartonian middle Eocene of southern Morocco" . Journal of African Earth Sciences. 111: 273–286. doi:10.1016/j.jafrearsci.2015.08.006.
  4. 1 2 Zouhri, Samir; Gingerich, Philip D.; Khalloufi, Bouziane; Bourdon, Estelle; Adnet, Sylvain; Jouve, Stéphane; Elboudali, Najia; Amane, Ayoub; Rage, Jean-Claude; Tabuce, Rodolphe (11 March 2021). "Barytherium sp. Andrews 1901". doi:10.5281/zenodo.4606655.{{cite journal}}: Cite journal requires |journal= (help)