The BGS Lexicon of Named Rock Units — Result Details
Haystacks Andesite Member
Computer Code: | HAYS | Preferred Map Code: | Hys |
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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) |
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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 |