Zealandia

Zealandia presents a unique case in continental geology rather than traditional archaeology, as its submersion occurred tens of millions of years before any human presence on Earth. The continental fragment has been studied extensively by researchers from GNS Science and other institutions, who have used satellite imagery, seabed mapping, and geological surveys to understand its structure and history. Mapping efforts completed in 2023 have revealed that Zealandia possesses all the geological characteristics of a continent, including continental crust thickness and density distinct from oceanic crust.

The scientific consensus, established through decades of geological research, indicates that Zealandia subsided beneath the Pacific Ocean between 83-79 million years ago, during the Cretaceous period when dinosaurs still roamed the Earth. This timeline places Zealandia's submersion approximately 80 million years before the earliest human ancestors appeared in the fossil record. Researchers like Nick Mortimer have noted that if ocean levels were lower, Zealandia would have been recognized as a continent much earlier due to its substantial size and geological properties.

While the landmass itself predates human civilization by millions of years, the waters above Zealandia support substantial marine ecosystems and contain significant natural resources. The region includes the Maui gas field near Taranaki and has been explored for oil deposits, particularly in the Great South Basin where permits were issued in 2007. The seabed also contains valuable mineral resources including ironsands, volcanic massive sulfides, and ferromanganese nodule deposits, making it an area of ongoing scientific and economic interest despite its ancient geological origins.