Back

Minyon Falls Rhyolite Member

Minyon Falls Rhyolite Member
Stratigraphic range: ~
TypeGeological formation
Unit ofNimbin Rhyolite
Thickness500 metres (1,640 ft)
Location
Coordinates28°36′55″S 153°23′05″E / 28.615278°S 153.384722°E / -28.615278; 153.384722
RegionNew South Wales
CountryAustralia
Type section
Named forMinyon Falls
Named byDuggan M.B., Mason D.R.
LocationNightcap National Park
Year defined1988

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]

  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