Volcanic Stratigraphy
Lavas from the Tweed Volcano are recognised as part of the Lamington Volcanics.
The volcanic stratigraphy of the Tweed Volcano is similar to many other hotspot volcanoes around the world. Eruptions of tholeiitic and some calc-alkaline basalts are the oldest recognised units derived from the volcano. These are named the Lismore/Beechmont Basalt in New South Wales and Queensland respectively. There are numerous flows recorded which may have been erupted irregularly as fossil soil (Paleosol)profiles and lacustrine type rock units are occasionally found within the rock unit.
Following eruption of the Lismore/Beechmont Basalt a period of eruption of rhyolite lavas took place. Eruptions occurred in lava and some pyroclasic forms. These rhyolites are known in New South Wales as the Nimbin Rhyolite and Queensland as the Binna Burra Rhyolite. Following eruption of this rhyolite a period of basaltic volcanism resumed (or continued) with the eruption of the Blue Knob(NSW)/Hobwee(QLD) Basalt.
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