| Minyon Falls Rhyolite Member | |
|---|---|
| Stratigraphic range: ~ | |
 | |
| Type | Geological formation |
| Unit of | Nimbin Rhyolite |
| Thickness | 500 metres (1,640 ft) |
| Location | |
| Coordinates | 28°36′55″S 153°23′05″E / 28.615278°S 153.384722°E |
| 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]
- ^ "Nimbin Rhyolite". Geo Science Australia. Australian Government. Retrieved 16 October 2020.
- ^ "Minyon Falls Rhyolite Member". Geo Science Australia. Australian Government. Retrieved 16 October 2020.
- ^ 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