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Maerewhenua, Waitaki District, Canterbury Region, South Island, New Zealand

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Latitude & Longitude (WGS84): 44° 54' 34'' South , 170° 38' 20'' East
Latitude & Longitude (decimal): -44.90972,170.63889
GeoHash:G#: rb12dbrmy
Köppen climate type:Cfb : Temperate oceanic climate
Other/historical names associated with this locality:Maruwenua

In the Maerewhenua area, the basement rocks are partly metamorphosed sediments, possibly Triassic in age. These are overlain by later sediments including Tertiary. Two dolerite sheets, probably of early Oligocene age, invaded the sediments while these were still in a wet condition, and pillow structure is locally developed. A paper on the subject using "Maruwenua", an earlier form for the name of the district, was written by A. C. Amies.

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

4 valid minerals.

Detailed Mineral List:

Formula: CaCO3
Reference: Judy Rowe collection
Formula: SiO2 · nH2O
Reference: Judy Rowe collection
Opal var: Opal-AN
Formula: SiO2 · nH2O
Reference: Judy Rowe collection
Formula: SiO2
Formula: FeCO3
Reference: Judy Rowe collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Opal'4.DA.10SiO2 · nH2O
var: Opal-AN4.DA.10SiO2 · nH2O
Group 5 - Nitrates and Carbonates

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Rocks, etc.
var: Opal-AN-SiO2 · nH2O

List of minerals for each chemical element

H OpalSiO2 · nH2O
H Opal (var: Opal-AN)SiO2 · nH2O
C CalciteCaCO3
C SideriteFeCO3
O CalciteCaCO3
O OpalSiO2 · nH2O
O Opal (var: Opal-AN)SiO2 · nH2O
O QuartzSiO2
O SideriteFeCO3
Si OpalSiO2 · nH2O
Si Opal (var: Opal-AN)SiO2 · nH2O
Si QuartzSiO2
Ca CalciteCaCO3
Fe SideriteFeCO3

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 Macrostrat.org

Rupelian - Ypresian
28.1 - 56 Ma

ID: 1365946
Undifferentiated Onekakara Group Eocene - Oligocene sandstone

Age: Paleogene (28.1 - 56 Ma)

Stratigraphic Name: Onekakara Group

Description: Deepening facies sequence from shallow marine glauconitic sandstone; siltstone; marl; to biopelagic chalk.

Comments: Paleogene sedimentary rocks. Age based on paleontology

Lithology: Major:: {sandstone},Minor:: {siltstone, greensand}

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

Early Oligocene - Eocene
28.1 - 56 Ma

ID: 1313097
Undifferentiated Alma, Onekakara and Eyre groups

Age: Paleogene (28.1 - 56 Ma)

Stratigraphic Name: Alma Group; Onekakara Group; Eyre Group

Description: Micaceous and glauconitic sandstone, siltstone and calcareous mudstone with some bioclastic limestone and minor calcareous and siliceous diatomite with interbedded tuff.

Comments: Zealandia Megasequence Mainly Marine Sedimentary Rocks (Paleogene to Cretaceous)

Lithology: Sandstone, siltstone, mudstone, limestone, diatomite, tuffite

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]

Triassic - Permian
201.3 - 298.9 Ma

ID: 3189657
Paleozoic-Mesozoic crystalline metamorphic rocks

Age: Phanerozoic (201.3 - 298.9 Ma)

Stratigraphic Name: Haast Schist

Comments: Caples Terrane

Lithology: Metawacke; greenschist/almandine amphibolite grade metasedimentary/metavolcanic schist

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]

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


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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Amies, A. C. "Petrological features of the rocks of the Maruwenua district, North Otago", in Transactions of the Royal Society of New Zealand. Vol. 79, Parts 3-4, pp.376-385. March, 1952.

Localities in this Region
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