 The type locality of the formation is near the Great Western Highway in the suburb of Minchinbury in western Sydney.It is most often seen in the western parts of the city.Outcroppings are weak and not easily found, but it may be seen in places like road cuttings in localities from Epping, Grose Vale-Kurrajong, Kellyville, Rogans Hill, Bankstown, Pendle Hill, Bonnyrigg, Menangle, Duck River, Brownlow Hill and other sites.