"Akaroa Volcanic Group (9.1 – 8 Ma): Activity occurred simultaneously at the Mt Herbert and Akaroa volcanoes. Activity at Akaroa produced a 1200 km³ composite strato-shield cone, predominantly composed of alkali lavas, pyroclastics and shallow intrusives, which reached an estimated 1800m above sea level. Activity was predominantly from a central vent (suggested as Onawe Peninsula), although minor vents on the flanks, and radial dyking did occur.
The Akaroa Volcanic Group has been classified into extrusive and intrusive rocks. Extrusive rocks include the early stage Tikao Trachyte and Lushington Breccia, the main cone forming French Hill Formation (9.0 – 8.3 Ma), the flank eruptives of the Mt Sinclair Formation 8.6 – 8.3 Ma) and the Te Oka Formation (8.3 – 8.1 Ma). Intrusive rocks include the Duvachelles Gabbro (8.92 Ma) and the Onawe Syenite exposed on Onawe Peninsula, representing late stage emplacement."
Hampton, S. J. (2010) https://ir.canterbury.ac.nz/handle/10092/4117
"Darra Basanitoid (8.1 – 7.7 Ma): Columnar to irregularly jointed basanitoid lava flows, exposed on the
western and eastern sides of Quail Island, and overlie Lyttelton Volcanics between Taitapu
and Ahuriri. Lava flows on the north-western side of Quail Island are
flat lying with thin zones of auto-brecciation . North-eastern Darra
Basanitoid lavas overlie a basal yellow-brown, angular to sub-rounded, boulder to cobble
conglomerate, which overlies weathered Allandale Rhyolite."
Hampton, S.J. : https://ir.canterbury.ac.nz/handle/10092/4117
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