
Check out the basalt dyke at Bicentennial Park,West Pymble!
April 4, 2026We now have the Long Reef Geotrail interpretative sign installed at Fishermans Beach, Collaroy. This marks a major step forward in the evolution of the Long Reef Geotrail, one of the flagship initiatives within the Ku-ring-gai GeoRegion in Sydney’s Northern Beaches.
We are most grateful for the support of Northern Beaches Council in producing and installing this Long Reef sign.
This self-guided geotrail interprets a 245-million-year geological story embedded in Triassic rock sequences, offering insight into the processes that have shaped the Sydney Basin coastline. Follow the 8 Stops that highlight the key visible aspects of folded and stressed claystone cliffs, the fossilised remains of plants and insects and a Jurassic age (160 million years ago) dyke in plain view.
More than 140 species of birds have been recorded at Long Reef including 40 threatened species. In a visit you may see sooty oystercatchers, osprey, sea eagles, Australasian gannets, terns, cormorants or silver gulls.
More information is available on our Long Reef page.
Click here to view location on Google maps.
Photo of Dr Peter Mitchell OAM, our Committee member and expert on the geology of Long Reef pictured with Sue Heins, the Mayor of Northern Beaches Council .

