The Glass House Mountains are a group of eleven hills that rise abruptly from the coastal plain on the Sunshine Coast, Queensland, Australia. The highest hill is Mount Beerwah at 556 meters above sea level, but the most identifiable of all the hills is Mount Tibrogargan which from some directions appears to be a face staring out to sea. Mt Ngungun is a sub volcanic mountain. This means Mount Ngungun is a sub volcanic rock also known as a Hypabyssal Rock. It is an intrusive rock that is emplaced at medium to shallow depths within the crust, and has intermediate grain size and often Porphyritic texture between that of Volcanic and Plutonic rocks. Mount Ngungun and the Glass House Mountains are located near Beerburrum State Forest and Old Gympie Road. From Brisbane, follow the Bruce Highway north, take the Glass House Mountains tourist drive turn-off and follow the signs to the Glass House Mountains. The trip is about one hour and eleven minutes from Brisbane. The Volcanic peaks of the Glass House Mountains rise dramatically from the surrounding Sunshine Coast landscape. They were formed by intrusive plugs, remnants of volcanic activity that occurred 25-27 million years ago. Molten rock filled small vents or intruded as bodies beneath the surface and solidified into land rocks. Millions of years of erosion have removed the surrounding exteriors of volcanic cores and softer sandstone rocks.
We can actually see some of these peaks/plugs from the house we are minding.
