50 Australian Geographic
Old Homestead’s two ‘doline’ or sinkhole entrances –
one north and one south – lead to complex passages,
ranging from 50cm to 100m wide. Traversing them all
eventually takes cavers 85m below the surface.Crystalline needle gypsum forms through evaporation
in undisturbed clay areas of the cave systems,
which are drier than those in which stalagmites and
stalactites are deposited by the action of water.