Soom Shale
| Soom Shale Stratigraphic range: Hirnantian |
|
|---|---|
| Thickness | 10–15 m |
| Lithology | |
| Primary | Silts and mudstones |
| Location | |
| Location | South Africa |
The Soom Shale is a member of the Late Ordovician (Hirnantian) Cedarberg Formation (Table Mountain Group) in South Africa, renowned for its remarkable preservation of soft-tissue in fossil material.[1] Deposited in still waters, the unit lacks bioturbation, perhaps indicating anoxic conditions.[1]
It overlies the Pakhuis tillite and is overlain by the Disa Siltstone.[1]
It contains typical Ordovician microfossils, such as chitinozoa, acritarchs and spores, and its shelly fauna is also typical of this time period.[1]
Its macrofauna comprises pelagic organisms that sank rapidly to a barren sea floor.[2] These include brachiopods,[3] eurypterids, conodonts,[4] naraoiid trilobites, and orthoconic cephalopods.
External links
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References
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