Upper Cretaceous to Eocene stratigraphy and sample collections, mid-Waipara River section, North Canterbury

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SR_2003-008-pdf
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Morgans, H.E.G.; Jones, C.M.; Crouch, E.M.; Field, B.D.; Hollis, C.J.; Raine, J.I.; Strong, C.P.; Wilson, G.J. 2005 Upper Cretaceous to Eocene stratigraphy and sample collections, mid-Waipara River section, North Canterbury . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2003/08 101 p.

Abstract: This report describes the paleontological and biostratigraphic collections made from the mid-Waipara River section, North Canterbury, by Institute of Geological and Nuclear Sciences (GNS) scientists in February 2003. An overview of the 265 samples collected is presented along with a summary of their geographic locations, based on a detailed tape and compass survey, and stratigraphic positions. The collections concentrated on Paleocene, Paleocene/Eocene boundary, and Early to Middle Eocene successions and are being incorporated into ongoing investigations of the early Paleogene ‘greenhouse world’. The collections are presented in six lithologic columns – 1 to 6 – representing a geographic and stratigraphic progression from the westernmost (Column 1) to the easternmost (Column 6) location. Samples were taken from the Conway Formation, Loburn Formation, Waipara Greensand and Ashley Mudstone. Collections made by New Zealand Geological Survey (NZGS) and GNS scientists prior to 2003 have resulted in important advances in Late Cretaceous dinoflagellate cyst and spore/pollen biostratigraphy, high-resolution biostratigraphy and geochemistry across the Cretaceous/Paleocene boundary, and Paleogene foraminiferal biostratigraphy. Details of the NZGS and GNS collections, made from the 1930s to 2001, are presented in summary tables. A brief review of lithostratigraphic nomenclature of the sediments present in the mid-Waipara River section is included. The sedimentary succession contains Late Cretaceous (Broken River Formation, Conway Formation), Paleocene (uppermost Conway Formation, Loburn Formation, Waipara Greensand), Eocene (?uppermost Waipara Greensand, Ashley Mudstone, Amuri Limestone) and Oligocene (Amuri Limestone) sediments. (auth)