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The 'Chatham Rise' is an area of ocean floor to the east of New Zealand, forming part of the Zealandia continent. It stretches for some 1000 kilometres from near the South Island in the west, to the Chatham Islands in the east.
Relative to the rest of the Pacific Ocean waters around New Zealand, the Chatham Rise is relatively shallow, no more than 1000 metres deep at any point. This shallowness is made more remarkable by the depth of the ocean immediately to the north and south. To the northeast, the Hikurangi Trench, an extension of the much deeper Kermadec Trench, drops to below 3000 metres close to the New Zealand coast, and further from the coast the Rise borders on the Hikurangi Plateau. To the south, similar depths are achieved in the Bounty Trough. Past the eastern end of the rise, the sea floor drops away to the abyssal plain.
Geologically and tectonically, the Chatham Rise can be thought of as an extension of the eastern South Island. It was largely dry land around the Cretaceous-Paleogene boundary and formed a large peninsula extending from New Zealand to the Chatham Islands at that time. This was characterized by a volcanic landscape. Fossils found on the Chatham Islands characterize the flora and fauna of the Late Mesozoic Chatham Rise: it had forests dominated by gymnosperms (such as ''Araucaria'', ''Mataia'' and ''Podocarpus'') and Lycopodiopsida (clubmosses). Some angiosperms were also present. Dinosaurs such as theropods dwelt on the peninsula and probably evolved into numerous endemic forms.(Stilwell ''et al.'' 2006)

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References

★ Stilwell, Jeffrey D.; Consoli, Christopher P.; Sutherland, Rupert; Salisbury, Steven; Rich, Thomas H.; Vickers-Rich, Patricia A.; Currie, Philip J.; Wilson, Graeme J. (2006): Dinosaur sanctuary on the Chatham Islands, Southwest Pacific: First record of theropods from the K–T boundary Takatika Grit. ''Palaeogeography, Palaeoclimatology, Palaeoecology'' '230'(): 243–250. (HTML abstract)