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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 14, issue 1
J. Micropalaeontol., 14, 29–36, 1995
https://doi.org/10.1144/jm.14.1.29
© Author(s) 1995. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 14, 29–36, 1995
https://doi.org/10.1144/jm.14.1.29
© Author(s) 1995. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Apr 1995

01 Apr 1995

Recent foraminifera from inter-reef channels, nearshore North Rarotonga, Cook Islands, South Pacific

G. W. Hughes G. W. Hughes
  • Saudi Arabian Oil Company, Geological Research and Development Division, Exploration Department, P.O. Box 5000, Dhahran, Saudi Arabia

Abstract. The Avatiu and Avarua sand-covered channels within the fringing reef of north Rarotonga, Cook Islands, contain foraminiferal assemblages considered to be predominantly derived from the adjacent reef platform. Benthonic species which display a depth restriction include Melonis affinis, Cassidulina delicata, Clavulina pacifica and Bolivina alata. Small (less than 200 μm), rare planktonic species, including Globigerina bulloides, are recovered from sediments as shallow as 8 m, but an increase in species diversity and abundance is noted at 30 m in Avarua channel and 48 m in Avatiu channel.

No clear depth, substrate nor symbiont-associated restriction of species is evident, and this may result from mixing of primary microfaunal assemblages by sediment transport in this exposed part of the island.

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