New Zealand Journal of Geology and Geophysics abstracts
A reassessment of abruptly fanning bed dips on the northwestern limb of the
Huangarua Syncline, Wairarapa, New Zealand
ANDREW NICOL
RUSSELL VAN DISSEN
Institute of Geological & Nuclear Sciences
P.O. Box 30 368
Lower Hutt, New Zealand
Abstract Trench and outcrop data are used to reinterpret
abruptly fanning bed dips described by Lamb & Vella in Pleistocene
conglomerates on the northwestern limb of the Huangarua Syncline, Wairarapa.
These data indicate that c. 70% (c. 40deg.) of the reported change in
bed dip occurs across an angular unconformity. The conglomerate above the
unconformity, which is significantly younger than the underlying lower Te Muna
Formation (c. <=1.6 Ma), is correlated with the Ahiaruhe Formation
(c. 0.015-0.5 Ma). Pleistocene stratigraphy was influenced by
discontinuous sedimentation across the entire northwestern limb of the syncline
during folding.
Keywords folding; Pleistocene; conglomerates; Wairarapa;
angular unconformity; Te Muna Formation; Ahiaruhe Formation
New Zealand Journal of Geology and Geophysics, 1997, Vol. 40: 257-260
0028-8306/97/4002-0257 $7.00/0 (c) The Royal Society of New Zealand
1997
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