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Round Hill, Waitaki District, Otago Region, South Island, New Zealand

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Latitude & Longitude (WGS84): 45° 1' 31'' South , 170° 51' 39'' East
Latitude & Longitude (decimal): -45.02548,170.86110
Köppen climate type:Cfb : Temperate oceanic climate

The site is off the Ngpara Weston road and opposite the church, the area is locally referred to as Round Hill.
This hill was once a submerged volcano and was probably connected with the Oamaru volcanics. What is unusual with these volcanics is the presence of this yellow material interdispersed through the volcanics (basalt). It ranges in colour from yellow (like hokey pokey) to brown to dark red or a pattern of these colours.The rock has several different forms – nodular, layered, nodular on surface only to very solid (agate like) -this material was the hardness and can be polished, cut and carved.
To the east of the hill the exposed basalt when broken showed cavities that had filled with calcite – giving the ‘eye agate look’ that can be found at the Maerewhenua River.

Mineral List

3 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

0 - 2.588 Ma

ID: 3192366
Cenozoic sedimentary rocks

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Gravel,glacial deposits,conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Early Oligocene
28.1 - 33.9 Ma

ID: 1311574
Deborah Volcanics

Age: Oligocene (28.1 - 33.9 Ma)

Stratigraphic Name: Deborah Volcanics

Description: Basaltic scoria, tuff, lapilli and breccia; basaltic and doleritic dikes, plugs and intrusive masses.

Comments: Zealandia Megasequence Extrusive and Intrusive Rocks (Paleogene to Cretaceous)

Lithology: Basalt, tuffite, lapilli tuff, breccia, dolerite

Reference: Edbrooke, S.W., Heron, D.W., Forsyth, P.J., Jongens, R. (compilers). Geology Map of New Zealand 1:1 000 000. GNS Science Geological Map 2. [12]

28.1 - 33.9 Ma

ID: 1361275
Deborah Volcanics basalt (Alma Group)

Age: Oligocene (28.1 - 33.9 Ma)

Stratigraphic Name: Deborah Volcanics

Description: Basanitic and basaltic flows, dikes, plugs and intrusive masses of Deborah Volcanics.

Comments: Paleogene igneous rocks. Age based on K-Ar dating

Lithology: Major:: {basalt},Minor:: {basanite}

Reference: Heron, D.W. . Geology Map of New Zealand 1:250 000. GNS Science Geological Map 1. [13]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

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