Unknown
Cramer in der Gebr. Borntraeger Verlagsbuchhandlung, Stuttgart, Germany
In:
EPIC3Diatom research over time and space Morphology, taxonomy, ecology and distribution of diatoms - from fossil to recent, marine to freshwater, established species and genera to new ones, (Nova Hedwigia, Beihefte, ISSN 0078-2238 ; 143), Stuttgart, Cramer in der Gebr. Borntraeger Verlagsbuchhandlung, Stuttgart, Germany, 143, 518 p., pp. 1-31, ISBN: 978-3-443-51065-7
Publication Date:
2014-07-24
Description:
Abundant and well-preserved diatoms and silicofl agellate assemblages are documented through
a complete late Eocene sequence, ODP Hole 1090B, recovered from the southern Agulhas Ridge in the
sub-Antarctic South Atlantic. A sequence of Cestodiscus (diatom) species occurrence events involving C.
pulchellus var. novazealandica, C. fennerae, C. antarcticus, C. convexus, C. trochus, and C. robustus is tied
with paleomagnetic stratigraphy and provides the basis of proposing a new diatom zonation for the latest
middle Eocene to early Oligocene (~37.6–33.4 Ma) of the sub-Antarctic South Atlantic. Comparison with
previously published diatom occurrence charts suggested this zonation should be applicable throughout the
low latitude regions of the world’s oceans. Silicofl agellates belong to the Dictyocha hexacantha and the
overlying Corbisema apiculata Zones. The late Eocene succession of silicofl agellate species is dominated
by Naviculopsis (20–60%). Naviculopsis constricta and N. foliacea dominate the D. hexacantha Zone,
followed by the N. constricta, then N. biapiculata in the C. apiculata Zone. Cold-water Distephanus is
most abundant in the latest Eocene along with N. biapiculata. The tops of zonal guide fossils Dictyocha
hexacantha and Hannaites quadria (both 36.6 Ma) and Dictyocha spinosa (37.1 Ma) are tied with
paleomagnetic stratigraphy.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Inbook
,
peerRev
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