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

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 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.

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

This data layer spatially represents depositional unconformities within the geological materials, divided by age, present at the surface interpreted from seismic data. The data structure complies with the GeoSciML 4.1 standard where relevant and uses the relevant CGI Controlled Vocabularies.

This georeferenced raster image represents aeromagnetic data for the Middlemarch area depicting total magnetic intensity, reduced to pole, horizontal gradient. 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.

Mineral resource trace features are represented with line features and have attributes describing the commodity available, host geological feature, type of working and lithology, if known. 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.

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.

Annotation in this layer contains age information for point features in NZL_GNS_GM5_geochronology_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 collection of datasets comprises the 'Geology of the Hyde-Macraes Shear Zone and Waihemo Fault Zone area' 1:50 000 compilation of geological data covering a part of of East Otago and extending off shore to the Karitane Canyon.