Drillhole depth to top of time slices

Created: 19 Nov 2024 Revised: 15 Jan 2025

As part of the development of the Solid Geology dataset for South Australia, a broad age-based time slice concept was established to highlight the major phases of the State's geological development based on separation (as far as possible) by major breaks in the rock record. This enabled the separation of the stacked basins and basement provinces which characterise the State's geology. This systematic breakdown was intended to promote a better appreciation of the progression of geological events through space and time.

Eight time slices were identified: · Archaean to early Mesoproterozoic · Middle Mesoproterozoic · Late Mesoproterozoic · Neoproterozoic · Cambrian to Late Carboniferous · Late Carboniferous to Triassic · Jurassic to Cretaceous · Cenozoic

SA_GEODATA database holds stratigraphic logs for approximately 43 400 drillholes, coded with an age-based Map Symbol system which is also used for corporate digital map polygons, including the Mineral Geological Provinces layer. Therefore, a robust query of the SA_GEODATA log data based on the stratigraphic units represented in each of the time slice layers has enabled production of point data of stratigraphic units and top depths, separated into time slices.

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GDP00003.zip		ZIP (260.31 MB)
TimeSlices_thumbnail.png		PNG

About this record

Record No	mesac706
Topic	Geoscientific Information
Type of Resource	Dataset
Category Type	Basement Geology Drilling Engineering Earth Sciences Engineering Geochemistry Geology Geophysics Geospatial Information Systems Physical Geography Resources Engineering Stratigraphy
Document Type
Contributor
Sponsor
Tenement
Tenement Holder
Operator
Geological Province
Other
Mine Name
Stratigraphy
Commodity
Notes
Language	English
Metadata Standard	ISO 19115-3

Citations

Use constraints	License
License	Creative Commons Attribution 4.0
Persistent identifier	https://pid.sarig.sa.gov.au/dataset/mesac706
Citation	Drillhole depth to top of time slices https://pid.sarig.sa.gov.au/dataset/mesac706

Technical information

Status	Completed
Maintenance and Update Frequency
Geographic Reference	GDA2020 (EPSG:7844)
Geo bounding box	{"type":"Polygon","coordinates":[[[129,-38],[141,-38],[141,-26],[129,-26],[129,-38]]]}
Purpose	Mineral exploration; modelling Mineral exploration; modelling
Lineage	Lineage:Drillhole 'time slices' extracted from SA Geodata drillhole stratigraphy. Positional accuracy:Accurate to approximately 100 metres Attribute accuracy:Accurate Logical consistency:Consistent Completeness:In progress, subject to update Lineage:Drillhole 'time slices' extracted from SA Geodata drillhole stratigraphy. Positional accuracy:Accurate to approximately 100 metres Attribute accuracy:Accurate Logical consistency:Consistent Completeness:In progress, subject to update

Attribute details

Name	Definition
DHNUMBER	System generated number which uniquely identifies a drillhole in SA_GEODATA
DH_NAME	Drillhole name
FROM_DEPTH	The down-hole depth of the first occurrence of a particular time slice
MAX_DEPTH	End of hole depth (m)
MAPUNIT	Map unit for the stratigraphic unit as used on published maps
STRAT_NAME	Name of the stratigraphic unit
TIME_SLICE	A broad age based time
DH_ELEV	Surface elevation of the drillhole collar
TIME_ELEV	The elevation of the top of the time slice
GDA94_X	x co-ordinate using Geocentric Datum of Australia 1994 (GDA 94)
GDA94_Y	Y co-ordinate using Geocentric Datum of Australia 1994 (GDA 94)
LCC_X	X co-ordinate using GDA 1994
LCC_Y	Y co-ordinate using GDA 1994
ADJGDA94_X	Adjusted GDA 1994 latitude
ADJGDA94_Y	Adjusted GDA 1994 longitude
ADJGDA20_X	Adjusted GDA 2020 latitude
ADJGDA20_Y	Adjusted GDA 2020 longitude
ADJLCC_X	Adjusted GDA 94 South Australian Lambert X co-ordinate
ADJLCC_Y	Adjusted GDA 94 South Australian Lambert Y co-ordinate