Forbes (SI5507) Depth to bedrock 1:250 000 scale Map - 1st Edition  

Authors / CoAuthors

Raymond, O.L. | Gibson, D.C. | Chan, R.

Abstract

The image and contours show the depth to slightly weathered bedrock. In many areas, for instance in the deep palaeovalleys of the Lachlan River and Bland and Goobang Creeks, this is most probably broadly equivalent to the depth of transported sediment cover. However, from the drill hole logs available, it is generally not possible to distinguish between transported material and highly weathered saprolite. It is therefore difficult in some areas to estimate the thickness of transported versus in situ regolith material. The model of depth to slightly weathered bedrock is derived primarily from the NSW Department of Land and Water Conservation database of almost 2000 water bores drilled on the Forbes 1:250,000 sheet. These drill holes were supplemented with point and contour data from over 300 mineral exploration industry drill holes. The model was also constrained by the boundaries of outcropping bedrock, and by known and inferred palaeochannel locations interpreted largely from seismic and aeromagnetic surveys. The data were gridded using the TOPOGRID module of ESRI's Arc/Info software, which is based on the ANUDEM program developed by M. Hutchinson ("A new procedure for gridding elevation and stream line data with automatic removal of spurious pits", Journal of Hydrology, 106, 211-232, 1989).

Product Type

nonGeographicDataset

eCat Id

33688

Contact for the resource

Keywords

• Geological Map250K scale

( Theme )

• regolith

( Theme )

• hydrogeology

( Theme )

• geology

( Theme )

• mapping

• AU-NSW

Australian and New Zealand Standard Research Classification (ANZSRC)

• Geology

• Published_External

Publication Date

2000-01-01T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

Purpose

Maintenance Information

unknown

Topic Category

geoscientificInformation

Series Information

Lineage

Unknown

Parent Information

Extents

[-34.0, -33.0, 147.0, 148.5]

Reference System

Spatial Resolution

Service Information

Associations

Downloads and Links

File download  

Source Information

Source data not available.