Geology of Galaringi and the Dundas Quarry

The rocks of the Dundas to Carlingford area in the north-west of Sydney were mainly formed about 235 million years ago as sediments laid down in a shallow freshwater lake.

After the sediments were buried to become rocks (and perhaps uplifted) they were then intruded by the neck of a volcano – maybe 175 million years ago, but no firm evidence has been found. Since then there has been a long period of gentle uplift and erosion. That erosion exposed the volcanic neck and apparently created a prominent outcrop on the slopes below Carlingford.

This Primefact looks at:

• rocks at Dundas
• digging the Dundas rocks
• Dundas Quarry after the quarrying
• visitors - then and now.