| Kokoamu Greensand | |
|---|---|
| Stratigraphic range: Chattian ~ | |
| Type | Geological formation |
| Unit of | Otiake Group |
| Underlies | Otekaike Limestone |
| Overlies | Earthquakes Marl |
| Thickness | up to 7 metres (20 ft) |
| Lithology | |
| Primary | Greensand |
| Other | Limestone |
| Location | |
| Coordinates | 44°42′S 170°30′E / 44.7°S 170.5°E |
| Approximate paleocoordinates | 50°30′S 176°18′W / 50.5°S 176.3°W |
| Region | Canterbury, Otago |
| Country | New Zealand |
| Extent | Around Duntroon, South Island |
.png)  Kokoamu Greensand (New Zealand) | |
The Kokoamu Greensand is a geological formation found in New Zealand. It is a fossil-bearing, late Oligocene, greensand rock unit of the eastern South Island, especially the Waitaki District of North Otago and the southern Canterbury region. The formation was named by geologist Maxwell Gage in the 1950s. In North Otago it underlies the thicker and harder Otekaike Limestone.[1] The formation gets its green colour from the mineral glauconite which forms slowly on the ocean floor.
- ^ Fordyce, R. Ewan. "The Kokoamu Greensand – Late Oligocene, New Zealand". Geological Settings. Department of Geology, University of Otago. Retrieved 2012-02-29.