Cook's Head Rock is a phonolite basalt rock standing on the Chrystall's Beach expanse closely north of the rivermouth settlement Toko Mouth of

South Otago South Otago lies in the south east of the South Island of New Zealand. As the name suggests, it forms the southernmost part of the geographical region of Otago. The exact definition of the area designated as South Otago is imprecise, as the area ...

New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

. The lower faces of the rock are made up of numerous hexagonal basalt columns suggesting Cook's Head Rock is a former

volcanic vent A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often fo ...

References

Rock formations of Otago Volcanic plugs of New Zealand {{otago-geo-stub

See also

References