Tweed Volcano is estimated to be around 3 million years old. Active within the Miocene era, the continent eventually shifted enough to cover it.
Tweed Volcano is actually one part of three volcanoes that were once one enormous volcano that measured 100 kilometers in diameter. The other three remaining parts of the set are Mount Warning, the border ranges and the Lamington Plateau.
Tweed is in a group that even now has a caldera of 1,000 meters deep and a diameter of 40 kilometers. The area has been dormant of volcanic activity for an estimated 20 million years.
The area around Tweed volcano, known as the Clarence-Morton Basin, is 250 to 300 million years old itself. This is the section of the continent that covered the original ancient volcano.
Over the last 20 million or so years, the ancient layers of rock on and around the points of the Tweed Volcano group are now exposed by erosion simply by the elements.
Article Written By Donald Pennington
Donald Pennington began writing in 2007 with AssociatedContent.com. Recently, he also began appearing on Factoidz.com, as well as DivorceSupport.info, and DonPennington.info. Donald Pennington is self-educated. His area of expertise is in social networking and politics.