| Soom Shale | |
|---|---|
| Stratigraphic range: Hirnantian | |
 Typical lithological features of the Soom shale, note the frequent beds of white quartz | |
| Unit of | Cederberg Formation, Table Mountain Group |
| Underlies | Disa Siltstone |
| Overlies | Pakhuis Tillite |
| Thickness | 10–15 m (33–49 ft) |
| Lithology | |
| Primary | Shale |
| Location | |
| Coordinates | 33°00′S 19°00′E / 33.0°S 19.0°E |
| Approximate paleocoordinates | 28°30′S 153°42′E / 28.5°S 153.7°E |
| Region | Western Cape |
| Country |  South Africa |
  Soom Shale (South Africa) | |
The Soom Shale is a member of the Late Ordovician (Hirnantian) Cederberg 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] nektaspids, trilobites, a lobopodian[5] and orthoconic cephalopods.
- ^ a b c d Gabbott, S. E. (1999). "Orthoconic cephalopods and associated fauna from the late Ordovician Soom Shale Lagerstatte, South Africa". Palaeontology. 42 (1): 123–148. Bibcode:1999Palgy..42..123G. 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. Bibcode:2009JPal...83..614B. doi:10.1666/08-136.1. S2CID 130762651.
- ^ 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. Bibcode:2013Palgy..56..261A. doi:10.1111/j.1475-4983.2012.01194.x.
- ^ Whittle, Rowan J.; Gabbott, Sarah E.; Aldridge, Richard J.; Theron, Johannes (May 2009). "AN ORDOVICIAN LOBOPODIAN FROM THE SOOM SHALE LAGERSTÄTTE, SOUTH AFRICA". Palaeontology. 52 (3): 561–567. doi:10.1111/j.1475-4983.2009.00860.x.