. . "Defined by the base of overlying bedded breccias, sandstones and tuffs of the Round How Member."@en . "Andesite with subsidiary tuff, volcaniclastic-breccia and volcaniclastic-sedimentary-rock. Stratified bedrock. Occurs onshore. Deposited during the Caradoc Series (Ordovician Period) (458.2-449.75 Ma BP)."@en . . . . "stable"@en . "458.2"^^ . "Haystacks Andesite Member"@en . "HAYS"@en . . . "At the base of the andesite lava sequence resting on volcaniclastic rocks within the Birker Fell Andesite Formation."@en . . . "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."@en . . "449.75"^^ . "Haystacks Andesite [Obsolete: use HAYS]"@en . "About 500m"@en . "Haystacks Andesite Member"@en . "Haystacks Member [Obsolete: use HAYS]"@en .