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PebbleTrack
NB: Originally posted elsewhere on the Global Riders Network and appears via syndication.
Mostly just dirt, there are some sections with gravel or mixed with small stones.
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Those stones look like "Nepean River Gravel". It's common around that part of the Sydney basin:
http://anlscape.com.au/Products/decorative-grave...
Over millions of years it washed down the river, rounded and came to rest there. A great deal of it has been mined for concrete. Sand too.
Check out the sized of the mined area:
http://maps.google.com.au/maps?f=q&source=s_q&hl...