An Aboriginal burial site near Condobolin could be more than 25 thousand years old.

The remains of an aboriginal man were found on a private property, around 50 kilometres from the town earlier this year.

An archaeologist with the New South Wales Office of Environment and Heritage Phil Purcell says the fossilisation of the bones dates them as being around 10 thousand years old.

However he says the location of the grave, near the former watercourse of the Lachlan River, suggests the find could be even older.

"Scientists had previously dated part of these ancient watercourses to 25 thousand years ago, when that part of the Lachlan River, now extinct, was flourishing with water," Mr Purcell said....