Abstract
The Marshall Paraconformity is a regional mid-Oligocene unconformity that occurs widely in shelf sequences from the eastern New Zealand passive continental margin. The paraconformity represents a break in sedimentation of at least 3 m.y. and coincided with a regional sea-level highstand, in contrast to the prediction of global lowstand at 29 m.y.b.p. Similar paraconformities are widespread on other southern continents. Deep-sea hiatuses of similar age occurred in the adjacent southwest Pacific ocean basins; they may or may not have a common origin with the hiatus associated with the Marshall Paraconformity. Possible causes for the paraconformity and its associated glauconitic and bioclastic sediments are sea-level fluctuations, including those related to local geoidal effects, or erosive bottom waters stemming from the development of Antarctic glaciation or from splitting of the southern continents.
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