Aridal Formation | |
---|---|
Stratigraphic range: Middle Eocene, Lutetian–Priabonian | |
![]() | |
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]
The formation represents the world's richest Bartonian archaic whale assemblage, including protocetids and basilosaurids. [2]
Includes the earliest occurrence of the genus Pelagornis, extending its fossil record back by at least 10 million years. [2]
Taxa | Rock Unit | Age | Image |
---|---|---|---|
Pelagornis sp. | Gueran | Bartonian | ![]() |
Pelagornithidae indet. | El Breij Unit II | Bartonian |
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]
Taxa | Rock Unit | Age | Image |
---|---|---|---|
Pappocetus lugardi | Gueran, [3] Sabkha of Lebreij | Bartonian | |
Eocetus schweinfurthi | Gueran, [3] El Breij Unit II, El Breij Unit III | Bartonian | |
Chrysocetus fouadassii | Gueran [3] | Bartonian | ![]() |
Platyosphys aithai | Gueran [3] | Bartonian | ![]() |
? Barytherium sp. | Gueran [4] | Bartonian | ![]() |
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]
Taxa | Rock Unit | Age | Image |
---|---|---|---|
Pterosphenus schweinfurthi | Gueran | Bartonian | ![]() |
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 |
Taxa | Rock Unit | Age | Image |
---|---|---|---|
Galeocerdo eaglesomei | Gueran | Bartonian | |
Pristis lathami | Gueran | Bartonian | |
Propristis schweinfurthi | Gueran | Bartonian | ![]() |
Macrorhizodus praecursor | Gueran | Bartonian | ![]() |
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 |
Taxa | Rock Unit | Age | Image |
---|---|---|---|
Cylindracanthus sp. | Gueran, El Breij Unit I | Bartonian, | ![]() |
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