Much of Gisborne is founded on Quaternary alluvial sediment that overlies Miocene sandstone, which is exposed in the hills around the city.
Maps and Information
There are no geological mapping projects underway or imminent in the Gisborne area. Previously completed maps include:
2000/2018: QMAP 1:250 000 geological map
For wider and more generalised geological context of the Gisborne area, a 1:250 000 geological map was printed with accompanying explanatory text. Digital GIS and image versions of the map are available on DVD. The digital version has since been updated in a national GIS dataset at that nominal scale. The underlying GIS datasets have rich feature attributes.
- Mazengarb, C.; Speden, I.G. (compilers) 2000. Geology of the Raukumara area(external link). Institute of Geological & Nuclear Sciences 1:250 000 geological map 6. Lower Hutt, New Zealand. Institute of Geological & Nuclear Sciences Limited. 60p. + 1 sheet.
- Heron, D.W. (custodian) 2018. Geological Map of New Zealand 1:250 000(external link). GNS Science geological map 1 (2nd edition). Lower Hutt, New Zealand. GNS Science.
For wider geological context of the Gisborne area, a geological map image can be downloaded(external link) or interrogated through the geological map application(external link). For GIS users, the QMAP geological feature layers can be downloaded from GNS Science’s Web Map/Feature Service(external link).
1997: Unpublished 1:10 000 geological map of Gisborne
The city area of Gisborne is not covered by a published geological map in greater detail than 1:250 000 although an unpublished map at ~1:25 000 has been completed in digital form(external link) (Mazengarb & Brown 1997).
For GIS users, the layer NZL-Urban Gisborne geological units can be downloaded from GNS Science’s Web Map Service(external link).