Teviot Brook and others rise in the Border Range area between Qld and NSW. A resistant trachyte is heavily eroded and exposed basalts, ultramafic, andesite etc. overlying the basement shales and sandstones have been transported downstream. Fine zeolites are collected from these rocks.
Ref.:
Stevens, N. C. (1965): The volcanic rocks of the southern part of the main range, SE Queensland. Proceedings of the Royal Society of Queensland 11(3)
