Waitemata Group
| Waitemata Group | |
|---|---|
| Stratigraphic range: Early Miocene | |
Waitemata Group sandstones form the cliffs of Takapuna Beach | |
| Type | Geological group |
| Sub-units | Bream Subgroup, Warkworth Subgroup, Meremere Subgroup, Kawau Subgroup |
| Underlies | Waitakere Group |
| Overlies | Waipapa Terrane and Te Kuiti Group |
| Area | 130 km × 60 km (81 mi × 37 mi) |
| Thickness | up to 2,000 m (6,600 ft) |
| Lithology | |
| Primary | Sandstone, siltstone, mudstone |
| Other | Conglomerate, limestone, volcanoclastic sediments |
| Location | |
| Country | New Zealand |
| Type section | |
| Named for | Waitemata Harbour |
The Waitemata Group is an Early Miocene geologic group that is exposed in and around the Auckland Region of New Zealand, between the Whangarei Harbour in the North and the Raglan Harbour in the South. The Group is predominantly composed of deep water sandstone and mudstone (flysch). The sandstone dominated units form the cliffs around the Waitemata Harbour and rare more resistant conglomerates underlie some of Auckland's prominent ridges.