New Zealand Journal of Geology and Geophysics abstracts

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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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PDF file of entire paper: medium quality (314K); (scanned from paper original: notes about this process)

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