Hanging Rocks Formation
| Hanging Rocks Formation | |
|---|---|
| Stratigraphic range: Ediacaran | |
| Type | Formation |
| Unit of | Maplewell Group |
| Sub-units | Hallgate and Sliding Stone Slump Breccia Members |
| Underlies |
|
| Overlies | Bradgate Formation[2] |
| Thickness | 50 m (164 ft)[1] |
| Lithology | |
| Primary | Tuff |
| Other | Graywacke |
| Location | |
| Region | Leicestershire |
| Country | United Kingdom |
| Type section | |
| Named for | Bradgate Park |
The Hanging Rocks Formation is a geologic formation in Leicestershire, and is the youngest and smallest of the Maplewell Group and the larger Charnian Supergroup which it is a part of. Due to this, and the fact that the rocks are not well exposed at both the top and base,[1] there have been no Ediacaran fossils found to date, unlike the two underlying Bradgate and Beacon Hill Formations.
Dating
[edit | edit source]Despite the poor exposure of the formation, scientists were able to collect zircon crystals from the lower parts of the formation, allowing them to perform zircon U–Pb dating, which recovered a date of 556±6.4 Ma, close to the Bradgate Formations top age of 557 Ma. It is noted that the top of the formation is capped at a zircon age of roughly 550 Ma,[1] which is just before the first formations of the Nama assemblage were deposited.
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References
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