The Minerva Hills National Park sits on the Oligocene Minerva Hills Volcanics.
These volcanics have been broadly divided into a basal series of mafic lavas (some 70 m thick) overlain by a series of intercalated mafic volcanics, felsic volcanics ranging from trachyte to rhyolite and trachytic pyroclastics.
 The pyroclastics are related to plugs and domes.
The lower sequence has been dated at approximately 33 -34 Ma (million years) and the upper sequence 28.5–27.5 Ma.

The Minerva Hills Volcanics is a remnant of Oligocene hot spot volcanism known as the Cosgrove Hot Spot.
This hot spot forms the longest continental hot spot track on earth.
The Minerva Hills National Park sits on the Oligocene Minerva Hills Volcanics. These volcanics have been broadly divided into a basal series of mafic lavas (some 70 m thick) overlain by a series of intercalated mafic volcanics, felsic volcanics ranging from trachyte to rhyolite and trachytic pyroclastics.  The pyroclastics are related to plugs and domes. The lower sequence has been dated at approximately 33 -34 Ma (million years) and the upper sequence 28.5–27.5 Ma.
The Minerva Hills Volcanics is a remnant of Oligocene hot spot volcanism known as the Cosgrove Hot Spot. This hot spot forms the longest continental hot spot track on earth.
Minerva Hills National Park