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                <gco:DateTime>2018-06-06T03:48:27</gco:DateTime>
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                        <gco:CharacterString>HUN Geological Model Eroded Horizons Masks 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.


These shapefiles (MGA94 coordinates) are masks used to constrain the extent of interpolations for the various horizons in the RMS geological model. The masks define where the formations outcrop on the surface and thus define the eroded surface in the current topography. 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** 

Data was originally sourced from 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 shapefiles.

## **Dataset Citation** 

Bioregional Assessment Programme (2015) HUN Geological Model Eroded Horizons Masks v01. Bioregional Assessment Derived Dataset. Viewed 22 June 2018, http://data.bioregionalassessments.gov.au/dataset/0499bee7-a0c4-45e8-978b-e0ef0055fb0e.

## **Dataset Ancestors** 

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

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