Silicoflagellates and some sponge spicules from the southwest Pacific, Deep Sea Drilling Project, Leg 90.

Locker, Sigurd and Martini, Erlend (1985) Silicoflagellates and some sponge spicules from the southwest Pacific, Deep Sea Drilling Project, Leg 90. Initial Reports of The Deep Sea Drilling Project, 90 . pp. 887-924.

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Abstract

Silicoflagellates are described from Sites 588 (middle Eocene), 591 (middle Miocene to lower Pliocene), and 594
(middle Miocene to Quaternary) in the southwest Pacific. At Sites 591 and 594 a detailed silicoflagellate zonation is
possible, although there are some obvious differences arising from the latitudinal position of the sites in the silicoflagellate
assemblages. Comparison between the sequences recovered at Sites 591 and 206 (Leg 21) revealed two hiatuses in
the latter, but helped to establish a zonation for this area from the lower Miocene to the Pleistocene and a correlation to
standard nannoplankton zones. The stratigraphic implications of the taxonomy used by various authors and the species
concept presented here are discussed in detail. Special reference is made to types described by Ehrenberg and to later synonyma,
because the Ehrenberg collection is the base for all subsequent descriptions and evaluations of silicoflagellate
taxa.
Two new genera (Neonaviculopsis, Paramesocena), two new subspecies (Dictyocha fibula subsp. asymmetrica, Neonaviculopsis
neonautica subsp. praenautica), and three new forms (Dictyocha perlaevis f. pentaradiata, Distephanus
speculum subsp. speculum f. nonarius, and Mesocena ? hexalitha f. heptalitha) are described from the southwest Pacific
Neogene and Pleistocene.
Associated sponge spicules were noted and will be described in detail in a later paper, but some are documented on
Plate 13.

Document Type: Article
Keywords: DSDP Leg 90, Southwest Pacific, Silicoflagellates
Refereed: No
Open Access Journal?: Yes
Projects: Enrichment, DSDP
Date Deposited: 09 Mar 2016 14:05
Last Modified: 09 Mar 2016 14:05
URI: http://oceanrep.geomar.de/id/eprint/31786

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