Minyon Falls Rhyolite Member

Minyon Falls Rhyolite Member
Stratigraphic range: ~23.03–2.58 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Minyon Falls, Australia
Type	Geological formation
Unit of	Nimbin Rhyolite
Thickness	500 metres (1,640 ft)
Location
Coordinates	28.615278°S 153.384722°E / -28.615278; 153.384722
Region	New South Wales
Country	Australia
Type section
Named for	Minyon Falls
Named by	Duggan M.B., Mason D.R.
Location	Nightcap National Park
Year defined	1988

The Minyon Falls Rhyolite Member is a geologic formation in the far north east of New South Wales, Australia. This formation is up to 500 metres thick. Formed from a volcanic lava flow some 20 million years ago in the Cenozoic, it is part of the Nimbin Rhyolite group of the Lamington Volcanics. Constituents include porphyritic and non porphyritic rhyolite, obsidian, pitchstone, tuff, and agglomerate. It may be viewed at Minyon Falls.[1][2][3]

See also

Tweed Volcano

References

1. "Nimbin Rhyolite". Geo Science Australia. Australian Government. Retrieved 16 October 2020.
2. "Minyon Falls Rhyolite Member". Geo Science Australia. Australian Government. Retrieved 16 October 2020.
3. Brunker, R.L., Tweedale, G., 1972, Tweed Heads, New South Wales, 1:250 000 geological series map. Sheet SH/56-03, 1st edition., Geological Survey of New South Wales, 1v