New Zealand Journal of Geology and Geophysics abstracts
Synonymy and stratigraphic ranges of Belemnopsis in the Heterian
and Ohauan Stages (Callovian-Tithonian), southwest Auckland, New Zealand
A. B. Challinor
Department of Earth Sciences
University of Waikato
Private Bag 3105
Hamilton, New Zealand
Abstract Belemnopsis stevensi, Belemnopsis
maccrawi, and Belemnopsis sp. A (Challinor 1979a) are synonymous;
B. stevensi has priority. New belemnite material from Kawhia Harbour
and Port Waikato, together with graphical study methods, indicates that many
small fragmentary specimens associated with B. stevensi in the lower
part of its stratigraphic range are probably the same taxon. B. stevensi
has been found only in the Middle and Upper Heterian Stage (Lower Kimmeridgian)
at Kawhia and only in the Lower Ohauan Stage (Upper Kimmeridgian) at Port
Waikato. This apparently disjunct distribution is attributed to poor exposure
in the relevant sections. Belemnopsis kiwiensis n.sp., Belemnopsis
cf. sp. B, Belemnopsis sp. B, Belemnopsis sp. D, and Belemnopsis
spp. are associated with B. stevensi near the lowest known point in
its stratigraphic range. The distribution of stratigraphically useful belemnites
within the Heterian and Ohauan Stages is: Conodicoelites spp. (Lower
Heterian; correlated with Lower Callovian); Belemnopsis annae (Lower
and Middle Heterian; Lower Callovian/Lower Kimmeridgian); Belemnopsis
stevensi (Middle Heterian/Lower Ohauan; Kimmeridgian); Belemnopsis
keari (Upper Heterian; Kimmeridgian); Belemnopsis trechmanni (Upper
Ohauan; Upper Kimmeridgian/Middle Tithonian). The apparently extreme range
of Belemnopsis annae remains unexplained. Klondyke Sandstone (new)
is recognised as the basal member of Moewaka Formation (Port Waikato area).
Keywords Belemnopsis kiwiensis n. sp.; Belemnopsis;
synonymy; Heterian; Ohauan; Callovian; Oxfordian; Kimmeridgian; Tithonian;
belemnite zones; Kawhia; Port Waikato; Klondyke Sandstone; new stratigraphic
names; new taxonomic names
G02001 Received 7 January 2002; accepted 16 October 2002; published 21
March 2003
New Zealand Journal of Geology & Geophysics, 2003, Vol. 46: 79-94
0028-8306/03/4601-0079 $7.00/0 © The Royal Society of New Zealand
2003
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