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Published online by Cambridge University Press: 17 February 2023
The Ferrar dolerites form an interconnected stack of four massive sills that in various places breakout to the surface, erupting lavas and volcaniclastics. They are massive horizontal sheets, emplaced when the massive Gondwana continent broke up some 180 million years ago. Somewhat similar, but much less well exposed, systems are found throughout the world, including Eastern North America. The entire system was formed in less than about 500,000 years and other expressions of the system are exposed over some 4,000 km, reaching all the way west to South Africa.
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