Brand Group
| Brand Group | |
|---|---|
| Stratigraphic range: Cambrian | |
| Type | Group |
| Unit of | Charnwood terrane |
| Sub-units | [2]
|
| Overlies |
|
| Thickness | 355 m (1,164 ft)[2] |
| Lithology | |
| Primary | Pelite |
| Other | Quartzarenite, Greywacke, Breccia, Shale, Conglomerate |
| Location | |
| Region | Leicestershire |
| Country | United Kingdom |
The Brand Group is a geologic group in Leicestershire. It preserves Ichnotaxon dating back to the Cambrian period. It mainly contains pelites, with greywacke and breccia.[2]
Formation units
It is made up of two formations. Uppermost within the group is the Swithland Formation, consisting of purple pelites and fine greywackes, with thin discontinuous shale-pebble conglomerates at its base.[2] This is underlain by the Brand Hills Formation, which consists of quartzarenite interbedded with pelite, greywackes and berrica.[2]
In ascending stratigraphic order (lowest to highest):
- Swithland Formation
- Brand Hills Formation
- Stable Pit Quartzarenite Member
Dating
With the discovery of Teichichnus in the Swithland Formation, alongside several other ichnogenera,[1] researchers have been able to confidentially date the Brand Group to the Lower Cambrian, which led to the group being taken out of the Charnian Supergroup, and has also led to the research and discovery of a major hiatus and diorite intrusion between this group and the underlying Maplewell Group, which is dated to the Ediacaran and correlates to other Avalon and White Sea assemblage groups. Using Zircon U-Pb dating, a date is returned of 603±2 Ma, suggesting the intrusion is Lower Edicaran in age.[1]
See also
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 8 July 2014.
- ^ a b c d McILROY, D.; Brasier, M. D.; Moseley, J. B. (March 1998). "The Proterozoic–Cambrian transition within the 'Charnian Supergroup' of central England and the antiquity of the Ediacara fauna". Journal of the Geological Society. 155 (2): 401–411. doi:10.1144/gsjgs.155.2.0401.
- ^ a b c d e f Moseley, John; Ford, Trevor. "The Sedimentology of the Charnian Supergroup" (PDF). Mercian Geologist.
Content Disclaimer
Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.
- The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
- There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
- It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
- Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
- Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.