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  • Groundwater boreholes are represented by point data with each point having attributes describing location, depth and water levels, if known. Additional attribution characterising aquifer type has been added to the original data for the purposes of this project. The data layer is part of the 'Geology of the Middlemarch area' 1:50 000 dataset covering a part of of East Otago around Middlemarch township.

  • This layer represents quarries and escarpments and is based on LINZ Topo50 data modified using aerial photography and fieldwork.

  • This data layer spatially represents faults located at the surface or in Cretaceous-Cenozoic sedimentary rocks interpreted from seismic data. The dataset comprises arcs with each arc having attributes describing the type of fault, its name, age and activity, and the sense of movement and cumulative slip. The data structure complies with the GeoSciML 4.1 standard for ShearDisplacementStructureView and uses the relevant CGI Controlled Vocabularies.

  • Areas of similar magnetic character are identified by polygon features and described in terms of relative frequency and amplitude. This data layer contains interpretation of the total magnetic intensity reduced to pole aeromagnetic data from the Glass Earth geophysical survey undertaken in 2007. The data layer is part of the 'Geology of the Middlemarch area' 1:50 000 dataset covering a part of East Otago around Middlemarch township.

  • The extent and nature of landslide boundaries are represented by line features and described in terms of type and the accuracy with which the boundary is located. The data layer is part of the 'Geology of the Middlemarch area' 1:50 000 dataset covering a part of of East Otago around Middlemarch township.

  • This georeferenced raster image represents aeromagnetic data for the Middlemarch area depicting total magnetic intensity, reduced to pole, upwards continued to 500 metres. The data is part of a geophysical survey undertaken for Glass Earth NZ Ltd. in 2007. The data layer is part of the 'Geology of the Middlemarch area' 1:50 000 dataset covering a part of East Otago around Middlemarch township.

  • This dataset spatially represents sample locations where geochronological dating methods provide an assessment of age of the sampled material.

  • Annotation in this layer contains the mapSymbol for polygon features depicted in NZL_GNS_GM5_geological_units_50k. The data layer is part of the 'Geology of the Middlemarch area' 1:50 000 dataset covering a part of of East Otago around Middlemarch township.

  • This dataset is an interpretation of geophysical characteristics derived from aeromagnetic data for the area encompassed by this map. The dataset comprises arcs with each arc having attributes describing the type of anomaly represented and the geological feature inferred.

  • The extent and nature of geological folds are represented by line features and described in terms of the type, age and activity of the fold and the accuracy with which the fold axis is located. The data layer is part of the 'Geology of the Middlemarch area' 1:50 000 dataset covering a part of of East Otago around Middlemarch township.