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                <gco:DateTime>2018-06-06T04:16:04</gco:DateTime>
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                        <gco:CharacterString>HUN RMS Model Eroded Horizons Grids v01</gco:CharacterString>
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                <gco:CharacterString>## **Abstract** 

The dataset was derived by the Bioregional Assessment Programme from multiple source datasets. The source datasets are identified in the Lineage field in this metadata statement. The processes undertaken to produce this derived dataset are described in the History field in this metadata statement.


RMS geomodelling was used to construct the geological model for the Hunter subregion. The data set contains the eroded horizons extracted from the completed geological model in ESRI grid format. The model was built using data extracted from well completions reports published by mining companies and consultants which record the depth of various formations encountered during drilling works. These data were compiled into model input files (See data set: Hunter deep well completion reports - f2df86d5-6749-48c7-a445-d60067109f08) used to build the RMS model.


The naming convention refers to the geological age and depth (TVD ss = total vertical depth subsea reported to the Australian Height Datum) of the various formations as follows:


Regional horizon name     Age (geological stage)    Newcastle Coalfield                                    Hunter Coalfield                        Western Coalfield                            Central or Southern coalfields 


M600                           Top Anisian                    Top Hawkesbury Sandstone                    Top Hawkesbury Sandstone        Top Hawkesbury Sandstone    Base Wianamatta Group

M700                           Top Olenekian                    Base Hawkesbury Sandstone                    Base Hawkesbury Sandstone        Base Hawkesbury Sandstone    Base Hawkesbury Sandstone

P000                           Top Changhsingian            Base Narrabeen Group                            Base Narrabeen Group                Base Narrabeen Group                    Base Narrabeen Group

P100                           Upper Wuchiapingian    Base Newcastle Coal Measures            Base Newcastle Coal Measures   Top Watts Sandstone                    Top Bargo Claystone

P500                           Mid Capitanian                    Base Tomago Coal Measures                    Base Wittingham Coal Measures  Base Illawarra Coal Measures    Base Illawarra Coal Measures

P550                           Top Wordian                    Base Mulbring Siltstone                            Base Mulbring Siltstone                Base Berry Siltstone                    Base Berry Siltstone

P600                           Mid Roadian                    Base Maitland Group                            Base Maitland Group                Base Shoalhaven Group            Base Shoalhaven Group

P700                           Upper Kungurian            Top Base Greta Coal Measures           Top Base Greta Coal Measures        

P900                           Base Serpukhovian            Base Seaham Formation                           Base Seaham Formation        


with 'M' referring to Mesozoic and 'P' to Paleozoic

## **Purpose** 

For display on HUN 2.12 geological figures (at the time of this metadata Figure 009)

## **Dataset History** 

This model was then eroded using the present-day surface topography. The final eroded model has a horizontal resolution of 2000 x 2000 m (x y), with 109 vertical layers for a total of 511,118 cells. The depth ranges between 1185m above sea level and 5062 m below sea level.


Data originally sourced from 44 well completion reports and incorporated into the geological model. The final eroded model horizons were exported from RMS software as .dat files and converted to ESRI grids.

## **Dataset Citation** 

Bioregional Assessment Programme (2015) HUN RMS Model Eroded Horizons Grids v01. Bioregional Assessment Derived Dataset. Viewed 22 June 2018, http://data.bioregionalassessments.gov.au/dataset/9678c468-fa91-45ff-a965-e891eb6b07a9.

## **Dataset Ancestors** 

* **Derived From** [Geoscience Australia, 3 second SRTM Digital Elevation Model (DEM) v01](https://data.gov.au/data/dataset/12e0731d-96dd-49cc-aa21-ebfd65a3f67a)

* **Derived From** [Australian Coal Basins](https://data.gov.au/data/dataset/9d5a8d74-a201-42bd-9d49-3c392244be16)

* **Derived From** [Bathymetry GA 2009 9sec v4](https://data.gov.au/data/dataset/60fb8bf5-b97d-49c9-b7fb-e7d594d2c75b)

* **Derived From** [Hunter Groundwater Model extent](https://data.gov.au/data/dataset/6d4a8c97-f7ea-4840-9de9-af6f7b18b8d6)

* **Derived From** [South Sydney Deep Well Completion Reports V02](https://data.gov.au/data/dataset/110bca9d-c0c1-49e9-888c-2b3a8ae706f7)

* **Derived From** [HUN RMS Output Dat Files v01](https://data.gov.au/data/dataset/c975d250-b699-4585-b32f-cbfde4d8d436)

* **Derived From** [Hunter deep well completion reports](https://data.gov.au/data/dataset/f2df86d5-6749-48c7-a445-d60067109f08)

* **Derived From** [HUN GW modelling DEM v01](https://data.gov.au/data/dataset/f0927e8a-cc41-419b-ae68-660d5d5fa47b)

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