The BGS Lexicon of Named Rock Units — Result Details
Harestones Rhyolite
| Computer Code: | CFCOH | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Ordovician Period (O) — Ordovician Period (O) | ||
| Lithological Description: | A quartz-phyric rhyolite. Radiometric age: 419 +/- 4 Ma (Rb-Sr, whole rock) (Rundle, 1979); considered by many authors including Millward (2002) to have been re-set. | ||
| Definition of Lower Boundary: | Not defined. | ||
| Definition of Upper Boundary: | Not defined. | ||
| Thickness: | A near-vertical mass emplaced within the Drygill Shale Formation at the northern margin of the Carrock Fell Complex. | ||
| Geographical Limits: | Carrock Fell, Cumbria. | ||
| Parent Unit: | Carrock Fell Complex (CFCO) | ||
| Previous Name(s): | Harestones Rhyolite [in Carrock Fell Complex] [Obsolete Name and Code: Use CFCOH]
(-3916)
Harestones Felsite [Obsolete Name And Code: Use CFCOH] (HARE) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Great Lingy Hill. Millward (1999). | ||
| Reference(s): | |||
| Rundle, C C, 1979. Ordovician intrusions in the English Lake District. Journal of the Geological Society of London, Vol.136, 29-38. | |||
| Eastwood, T, Hollingworth, S E, Rose, W C C, and Trotter, F M. 1968. Geology of the country around Cockermouth and Caldbeck. Memoir of the Geological Survey of Great Britain, England and Wales, Sheet 23. | |||
| Millward, D. 2002. Early Palaeozoic magmatism in the English Lake District. Proceedings of the Yorkshire Geological Society, Vol. 54, Part 2, 65-93. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E023 | |||