the nightcap range is a mountain range located in the northern rivers region of new south wales, australia. the range is a spur off the great dividing range and extends generally southeast from mount burrell for about to peates mountain. it is separated from the remainder of the great dividing range by the nimbin gap. the range forms the southern flank of the mount warning (tweed) shield volcano and geologically, is formed from the lismore basalts which are then overlain successively by the nimbin rhyolites and finally the blue knob basalts.