Adelaide police are combing through loam at Mount Lofty Botanic Gardens after the discovery of a second human leg bone.
A human leg bone was found last week by gardeners in the Adelaide Botanic Gardens in the city while they were spreading mulch which had been mixed at the Mount Lofty Gardens site.
A second bone was found on Monday morning.
Detective Sergeant Malcolm Williams says the loam is from one of two quarries used south of Adelaide.
He says police are treating the discovery as suspicious, although the bone could be anything from decades to centuries old — via redwolf.newsvine.com