Earth:Limbunya Group
From HandWiki
| Limbunya Group Stratigraphic range: ~1640 Ma | |
|---|---|
| Type | Group |
| Overlies | Inverway Metamorphics |
| Thickness | ~300-400 m |
| Location | |
| Country | Australia |
The Limbunya Group is a group of late Paleoproterozoic formations from Australia. It contains several of the earliest eukaryotic fossils known, including several tubular forms and acritarchs.[1]
Paleobiota
After Riedman et al, 2023[1] Template:Paleobiota-key-compact
Paleobiota
| Paleobiota | ||||
|---|---|---|---|---|
| Genus | Species | Notes | Images | |
| Birrindudutuba |
|
Enigmatic tubular fossil, likely eukaryotic, covered in small circular plates. | ||
| Kamolineata |
|
Enigmatic ellipsoid fossil, likely eukaryotic | ||
| Filinexum |
|
Enigmatic tubular fossil, likely eukaryotic, outer wall composed of bound fibres | ||
| Satka |
|
Enigmatic spherical fossil, likely eukaryotic, covered in small plates | ||
| Siphonoseptum |
|
Enigmatic filamentous fossil, bears similarities to both eukaryotic filaments and cyanobacteria | ||
| Spiromorpha |
|
Enigmatic filamentous/ellipsoid fossil, likely eukaryotic | ||
| Valeria |
|
Enigmatic spherical fossil, likely eukaryotic, unusually small for the genus | ||
| Dictyosphaera? |
|
Eukaryotic acritarch, differs from the assigned species in shape yet closest resembles it. | ||
| Gigantosphaeridium |
|
Eukaryotic acritarch | ||
| Limbunyasphaera |
|
Eukaryotic acritarch, earliest known fossil with an operculum | ||
| Tappania |
|
Eukaryotic acritarch | ||
| Germinosphaera |
|
Enigmatic acritarch | ||
| Leiosphaeridia |
|
Enigmatic acritarch, one of the widest-ranging Precambrian fossils | ||
| Navifusa |
|
Enigmatic acritarch, possibly eukaryotic | ||
| Oscilatoriopsis |
|
Enigmatic filamentous fossil, likely bacterial | ||
| Pterospermopsimorpha |
|
Enigmatic filamentous fossil | ||
| Siphonophycus |
|
Enigmatic filamentous fossil, likely bacterial | ||
| Tortunema |
|
Enigmatic filamentous fossil | ||
Alongside these, several undescribed forms are also recorded. Forms A and B are eukaryotic in nature, with B particularly resembling Satka in its spherical shape and the presence of plates. Form B also bears similarities to another unnamed organism from the Tonian Chuar Group.[1] The rest of the unnamed forms are mostly ellipsoidal or spherical in nature, with others being sheet-like or miscellaneous fragments.
References
- ↑ 1.0 1.1 1.2 Riedman, Leigh Anne; Porter, Susannah M.; Lechte, Maxwell A.; dos Santos, Angelo; Halverson, Galen P. (November 2023). "Early eukaryotic microfossils of the late Palaeoproterozoic Limbunya Group, Birrindudu Basin, northern Australia". Papers in Palaeontology 9 (6). doi:10.1002/spp2.1538.
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