Labertouche cave is a stream passage cave developed in Tynong Granite. It is occupied by a tributary of Labertouche Creek which flows underground for a distance of 175 metres. The accessible cave section is slightly shorter than this and is entered through an old stream sink located above the currently active stream passages. The cave consists of a passage through a pile of corestones of granite and in places there are exposures of in situ granite. Vigorous stream flow is maintained, which transports sand and gravel through the cave. Grooved and polished boulder surfaces found at several levels throughout the cave illustrate the abrasive action of this transported sediment. A smaller cave 200 metres to the east is on another tributary stream, but as yet no accessible cave passage has been discovered to this cave.