Stratigraphic drillholes at the Curiosity Shop and Evandale Quarries, Canterbury : results, stratigraphy and tectonic implications

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Field, B.D.; Strong, C.P.; Waghorn, D.B.; Wilson, G.J. 1989 Stratigraphic drillholes at the Curiosity Shop and Evandale Quarries, Canterbury : results, stratigraphy and tectonic implications. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report SL 20 1 v. (various paging)

Abstract: Two stratigraphic drillholes each of about 120 m depth were drilled to find the thickness of the Oligocene Amuri Limestone and the formations above and below it. Both holes recorded very thin units of Amuri mictrite with significant units of greensand and tuffaceous mudstone above it, and units of calcareous greensand (Nessing Greensand) below. The hole at Curiosity Shop showed that outcrops of sediments recently named ''Highbank Sandstone'' are merely weathered Kokoamu Greensand. The preserved thickness and facies variations within the Amuri provide further evidence for Early and/or middle Oligocene deformation in Canterbury.