Editing Darling Scarp (section)

=== Rock quarries ===
Also in the early to mid-twentieth century numerous rock quarries existed on the edge of the escarpment - visible and affecting both the aesthetics and the environment of the escarpment.

In the area where the [[Helena River]] emerges from its valley to the [[Swan Coastal Plain|sandplain]], there are still four quarries evident, despite being unused as quarries for fifty years or more.  Mountain<ref>{{cite web |url=http://www.climberswa.asn.au/climbwa/crags.asp?region=Around+Perth&crag=Mountain_Quarry&sort=NAME |title=Climbs in WA |date=2005-08-15 |access-date=2010-06-14 |archive-url=https://web.archive.org/web/20091005024313/http://www.climberswa.asn.au/climbwa/crags.asp?region=Around%20Perth |archive-date=5 October 2009 |url-status=dead }}</ref> and Stathams<ref>{{cite web |url=http://www.climberswa.asn.au/climbwa/crags.asp?region=Around+Perth&crag=Stathams_Quarry&sort=NAME |title=Climbs in WA |date=2008-07-20 |access-date=2010-06-14 |archive-url=https://web.archive.org/web/20091005024313/http://www.climberswa.asn.au/climbwa/crags.asp?region=Around%20Perth |archive-date=5 October 2009 |url-status=dead }}</ref> quarries are now managed as rock climbing locations.

* ''Bluestone quarry'' (1850s name), later known as ''Greenmount Quarry'' (1850s to 1920s), at [[Greenmount Hill]] on the west side of [[Greenmount National Park]].
* ''Mountain Quarry'' (now usually signed as ''Boya Quarry''), south of Greenmount Hill, which ceased operation in 1963.
* ''Byford brickworks (State Brickworks)'', shale scar visible from early 20th century to WW2 quarrying.
* ''[[Fremantle Harbour]] Works Quarry''  (sometimes, ''[[C. Y. O'Connor]]'s Mole Reconstruction Quarry'', and later known as the ''Public Works Quarry''), now ''Hudman Road Amphitheatre'' at edge of [[Darlington, Western Australia|Darlington]] - [[Boya, Western Australia|Boya]] localities border, operated from the 1900s to the 1930s.
* [[Statham's Quarry]] at [[Gooseberry Hill, Western Australia|Gooseberry Hill]] at northern edge of the [[Kalamunda Zig Zag]] formation.
* ''Armadale brickworks (State Brickworks)'', Bedfordale Hill, shale scar visible from 20th century quarrying, with an underground rail bypassing the [[South Western Highway]] to transport the ore.

There have also been visible quarries on the scarp in the [[Gosnells, Western Australia|Gosnells]] and [[Herne Hill, Western Australia|Herne Hill]] areas.

Legislative restrictions upon such developments were initiated in the late twentieth century to prevent further visible scars on the western face of the scarp.