Waaipoort Formation | |
---|---|
Stratigraphic range: Carboniferous (Visean) | |
Type | Geological formation |
Unit of | Witteberg Group [1] |
Overlies | Floriskraal Formation [1] |
Location | |
Country | South Africa |
The Waaipoort Formation is a geologic formation in South Africa. It preserves fossils dating back to the Visean, in the Carboniferous period. [1]
The Waaipoort formation consists of mudstones, siltstones, and fine sandstones and is around 35 meters thick. Fish-bearing localities are common and in most of these, the fish are present in calcitic or phosphatic nodules. At the Schiethoogte locality in the Eastern Cape, a 15 cm thick black layer made up of siltstone and fine sandstone contains two horizons where actinopterygian fossils are closely packed. These are thought to represent mass mortality events. [1]
The Waaipoort formation has most commonly been interpreted as a marginal marine environment, possibly a lagoon or a delta. The fauna, composed mostly of paleoniscoids, is a large divergence from the predominantly placoderm- and sarcopterygian- dominated faunas of previous Witteberg Group formations like the Witpoort Formation. [1]
Color key
| Notes Uncertain or tentative taxa are in small text; |
Acanthodians | |||
---|---|---|---|
Genus | Species | Clade | Images |
Gyracanthides [1] [2] | G. sp. | Climatiiformes |
Chondrichthyes | |||
---|---|---|---|
Genus | Species | Clade | Images |
?Protacrodontidae [2] | Protacrodontidae indet. | ?Protacrodontidae | |
?Plesioselachus [1] | ?Plesioselachus indet. |
Palaeonisciformes | |||
---|---|---|---|
Genus | Species | Clade | Images |
Willowmorichthys [1] [2] [3] | W. striatulus | Willowmorichthyidae | |
Mentzichthys [1] [3] | M. walshi | Rhadinichthyidae | |
M. jubbi | |||
M. maraisi | |||
M. theroni | |||
Australichthys [1] [3] | A. longidorsalis | Holuridae | |
Aesturichthys [1] [3] | A. fulcratus | Atherstoniidae | |
Adroichthys [1] [3] | A. tuberculatus | Amphicentridae | |
Sundayichthys [1] [3] | S. elegantulus | Canobiidae | |
Soetendalichthys [1] [3] | S. cromptoni | Platysomidae | |
Dwykia [1] [3] | D. analensis | Dwykiidae |
Eurypterida | |||
---|---|---|---|
Genus | Species | Clade | Images |
Cyrtoctenus [4] | C. wittebergensis | Hibbertopteroidea | |
Bivalvia | |||
---|---|---|---|
Genus | Species | Clade | Images |
2 undescribed species of ?Unionidae [2] | 2 undescribed species of ?Unionidae | ?Unionidae | |
Flora | |||
---|---|---|---|
Genus | Species | Clade | Images |
Praeramunculus [2] | P. striatiramus | ?Progymnospermopsida | |
Archaeosigillaria [2] | A. caespitosa | Lycopodiopsida | |
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The Cape Fold Belt is a fold and thrust belt of late Paleozoic age, which affected the sequence of sedimentary rock layers of the Cape Supergroup in the southwestern corner of South Africa. It was originally continuous with the Ventana Mountains near Bahía Blanca in Argentina, the Pensacola Mountains, the Ellsworth Mountains and the Hunter-Bowen orogeny in eastern Australia. The rocks involved are generally sandstones and shales, with the shales persisting in the valley floors while the erosion resistant sandstones form the parallel ranges, the Cape Fold Mountains, which reach a maximum height of 2325 m at Seweweekspoortpiek.
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The Eodicynodon Assemblage Zone is a tetrapod assemblage zone or biozone which correlates to the Abrahamskraal Formation, Adelaide Subgroup of the Beaufort Group, a fossiliferous and geologically important geological Group of the Karoo Supergroup in South Africa. The thickest outcrops, reaching approximately 620 metres (2,030 ft), occur south-east of Sutherland, north of Prince Albert, and south-east of Beaufort West. The Eodicynodon Assemblage Zone is the lowermost biozone of the Beaufort Group.
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