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
References
- ↑ 1.0 1.1 1.2 1.3 Gabbott, S. E. (1999). "Orthoconic cephalopods and associated fauna from the late Ordovician Soom Shale Lagerstatte, South Africa". Palaeontology 42: 123–148. doi:10.1111/1475-4983.00065.
- ↑ Aldridge, R.J.; Gabbott, S.E.; Theron, J.N. (2001). "The Soom Shale". Palaeobiology II. p. 340. doi:10.1002/9780470999295.ch79. ISBN 9780470999295.
- ↑ Bassett, Michael G.; Popov, Leonid E.; Aldridge, Richard J.; Gabbott, Sarah E.; Theron, Johannes N. (2009). "Brachiopoda from the Soom Shale Lagerstätte (Upper Ordovician, South Africa)". Journal of Paleontology 83 (4): 614. doi:10.1666/08-136.1.
- ↑ Aldridge, Richard J.; Murdock, Duncan J. E.; Gabbott, Sarah E.; Theron, Johannes N. (2013). "A 17-element conodont apparatus from the Soom Shale Lagerstätte (Upper Ordovician), South Africa". Palaeontology 56 (2): 261. doi:10.1111/j.1475-4983.2012.01194.x.