The BGS Lexicon of Named Rock Units — Result Details
Haystacks Andesite Member
| Computer Code: | HAYS | Preferred Map Code: | Hys |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | Andesite lavas with flow banding and columnar jointing, interdigitated with massive and bedded breccias in upper part of unit. Also some bedded volcaniclastic sedimentary rocks. | ||
| Definition of Lower Boundary: | At the base of the andesite lava sequence resting on volcaniclastic rocks within the Birker Fell Andesite Formation. | ||
| Definition of Upper Boundary: | Defined by the base of overlying bedded breccias, sandstones and tuffs of the Round How Member. | ||
| Thickness: | About 500m | ||
| Geographical Limits: | North Lake District, near Buttermere. | ||
| Parent Unit: | Birker Fell Andesite Formation (BFA) | ||
| Previous Name(s): | Haystacks Andesite
(-951)
Haystacks Member [Obsolete Name and Code: Use HAYS] (-4698) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Crags on Seat. | ||
| Reference Section | Crags on Hay Stacks. | ||
| Reference(s): | |||
| McConnell, B J and Kneller, B C, 1993. The Lower Borrowdale Volcanic Group of Ennerdale and upper Borrowdale. British Geological Survey Technical Report WA/93/38. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E029 | |||