New Zealand Journal of Geology and Geophysics abstracts
Late Eocene-Oligocene Te Kuiti Group at Mount Roskill, Auckland,
New Zealand
STEVEN W. EDBROOKE
ERICA M. CROUCH
HUGH E. G. MORGANS
RICHARD SYKES
Institute of Geological & Nuclear Sciences
P.O. Box 30 368
Lower Hutt, New Zealand
Abstract A 592 m deep water bore drilled at Mount
Roskill in central Auckland, New Zealand, intersected products of the Auckland
Volcanic Field (0-12 m), pumiceous sediments of the Tauranga Group
(12-23 m), interbedded sandstone and mudstone of the Waitemata Group
(23-475 m), and Te Kuiti Group sediments (475-592 m). This first
record of Te Kuiti Group in the central Auckland area comprises erosionally
truncated Glen Massey Formation beneath the Waitemata Group, a complete section
through Mangakotuku Formation, and an incomplete Waikato Coal Measures section.
Drilling stopped in Waikato Coal Measures, probably less than 30 m short
of Paleozoic or Mesozoic basement. Vitrinite reflectance measurements indicate
a lignite rank for coal fragments collected from the coal measures, and suggest
a maximum burial depth of c. 800 m. Six Te Kuiti Group samples
examined for palynomorphs and foraminifers gave ages ranging from Runangan to
early Whaingaroan and show a transition from a predominantly terrestrial late
Eocene environment to a shallow marine setting in the early Oligocene. This
result helps substantiate previous inferences about the continuity of Te Kuiti
Group deposition between Northland and Waikato, and supports the suggestion
that the southern limit to the Northland Allochthon lies north of
Auckland.
Keywords Te Kuiti Group; Northland Allochthon; Waitemata
Group; stratigraphy; late Eocene; Oligocene; Waikato Coal Measures; Mangakotuku
Formation; Glen Massey Formation; palynology;paleoenvironment; foraminifers;
paleogeography; Mount Roskill; Auckland
New Zealand Journal of Geology and Geophysics, 1998, Vol. 41: 85-93
0028-8306/98/4101-0085 $7.00/0 (c) The Royal Society of New Zealand
1998
PDF file of entire paper: medium quality (871K); (scanned from paper original: notes about this process)
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