GSNZ SIG webinar - PALEOTalk
Quaternary coastal sedimentary systems – using microfossils to date and analyse borehole sequences with Martin Crundwell
A pilot study was conducted on a groundwater borehole in Wellington Harbour, E3/E3A drilled off the Miramar Peninsula. In a novel approach for hydrogeology in New Zealand, the study used micropaleontological methods, rather than palynological methods, to characterise the paleoenvironmental setting of sedimentary layers in the borehole. The paleoenvironmental information was then utilised to develop an age model for the borehole and sedimentary facies by fitting a regression line (which represents a proxy for the paleo-shoreline) to the international sea-level curve. The dating of the borehole indicates the cored sedimentary record extends back 200,000 years and that the average subsidence rate during that time has been 0.126 m/kyr, which is much lower than present-day interseismic subsidence rate.
The Zoom link will be sent to all members of the Paleontology Special Interest Group.
The Zoom link is also available to all GSNZ members by contacting the Paleontology Special Interest Group convener (paleontology@gsnz.org.nz).
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