The Glasshouse Mountains are a series of steep-sided volcanic plugs which dominate the landscape of the Sunshine Coast Hinterland. According to science, they were formed of rhylite and trachtyte, lavas which hardened inside the vents of teritiary volcanoes that have been greatly reduced by about 25 million years of erosion.

http://www.sunshinecoast-australia.com/glass-house-mountains.html:

According to Aboriginal legend, Tibrogargan (364m high), the father and Beerwah (555m - highest peak) the mother, had a number of children. Coonowrin (377m high - narrowest and most dramatic of all the volcanic plugs) was the eldest, Tunbubudla were the twins (293m and 312m), Coochin (235m), Ngungun (253m), Tibberoowuccum (220m), Miketeebumulgrai (199m) and Elimbah (129m).

The legend tells of Tibrogargan noticing that the sea was rising and calling out to Coonowrin to help his pregnant mother gather the young children together so that the family could flee from the rising sea. Coonowrin ran away in fear and Tibrogargan, incensed by his son's cowardice, followed and hit him so hard with a club that his neck was dislocated. When the seas retreated the family returned to the plains. Conowrin, teased about his crooked neck and ashamed of his behaviour, went to Tibrogargan and asked for forgiveness but the father just wept with shame. Conowrin then approached his brothers and sisters to ask forgiveness but they too could only weep with shame, thus explaining the area's many small streams. Tibrogargan then called Conowrin and asked why he had failed to help Beerwah. He explained that he felt she was big enough to look after herself, though he did not know she was pregnant. Tibrogargan then turned his back on his son and still gazes out to sea today, refusing to look at his son who forever hangs his crooked neck and cries. Beerwah, the mother, is still pregnant, as it takes time to give birth to a mountain.

http://www.sunshinecoast-australia.com/glass-house-mountains.html