Abstract
Dredged calcareous sediments associated with the volcanic edifices of Gascoyne, Taupo, Derwent Hunter, Stradbroke, Britannia, Moreton and Recorder Seamounts (Tasmantid Seamount chain) and Nova Bank, Argo Bank, Capel Bank and Gifford Guyot (Lord Howe Seamount chain) have yielded a diverse biota including abundant foraminiferids and calcareous algae. These fossils constrain hypotheses on the age and environment of formation of the seamounts and also give data on oceanographic conditions existing at the time of accumulation of the sediments. All sediments accumulated in normal marine salinities. Gascoyne Seamount sedimentation originated in tropical to subtropical water 15–20 m deep but age-diagnostic fossils have not been recovered. Taupo Seamount includes sediments with a Late Miocene foraminiferid fauna with abundant calcareous algae but lacking Lepidocyclina. Water temperature was tropical to subtropical. Derwent Hunter Seamount has a similar biota but includes Lepidocyclina. The age is earliest Middle M...
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