The BGS Lexicon of Named Rock Units — Result Details
Garburn Dacite Formation
| Computer Code: | GAD | Preferred Map Code: | GaD |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | A flow-foliated and brecciated plagioclase-phyric dacite, interpreted as lava. | ||
| Definition of Lower Boundary: | Taken as the base of the dacite overlying volcaniclastic sandstone of the Esk Pike Formation. The two are mostly separated by later syn-BVG andesite intrusions. | ||
| Definition of Upper Boundary: | Defined by overlying sedimentary rocks of the Windermere Supergroup. | ||
| Thickness: | To 100m | ||
| Geographical Limits: | On the north side of Garburn Pass, from near Limefitt Park [NY 420 033] via Garburn, Buck Crag [NY 440 048] and Piked Howes [NY 446 050] to Goat House Crag, Kentmere [NY 451 046], east of Kentmere from Stile End [NY 469 049] to South of Wray Crag [NY 476 052]. | ||
| Parent Unit: | Borrowdale Volcanic Group (BVG) | ||
| Previous Name(s): | Garburn Formation [part] [Obsolete Name and Code: Use GAD]
(-272)
Garburn Formation [Obsolete Name and Code: Use GAD] (-4664) Upper Rhyolites [Obsolete Name and Code: Use GAD] (-2811) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Garburn, between Troutbeck and Kentmere, Cumbria. Johnson, E W. (In prep.) | ||
| Reference(s): | |||
| Mitchell, G H, 1929. The succession and structure of the Borrowdale Volcanic Series in Troutbeck, Kentmere and the western part of Long Sleddale (Westmorland). Quarterly Journal of the Geological Society of London, Vol. 85, 9-44. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E030 E039 | |||