The Largest Rock in Australia (It's Not Uluru) + 2 Other Oddities

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#australia #volcano #12apostles
Discover three of Australia’s most awe-inspiring geological wonders in this deep-time journey across the continent. From the highlands of Victoria to the lava plains of Queensland and the storm-battered southern coast, this documentary-style video explores the extraordinary forces that have shaped Australia’s ancient landscape. These three natural formations—Pine Mountain, the Undara Lava Tubes, and the Twelve Apostles—each reveal a unique chapter in Earth’s geological history. Whether you’re a geology enthusiast, a curious traveler, or a fan of Australia’s hidden natural wonders, this episode uncovers the science and stories written in stone across millions of years.

We begin with Pine Mountain, the largest single rock in Australia—1.5 times the size of Uluru. This massive granite inselberg, formed over 400 million years ago during the Devonian period, is the exposed core of an ancient magma chamber that slowly cooled deep beneath the surface. Over countless millennia, erosion stripped away the overlying rock to reveal this rugged monolith. Pine Mountain’s immense volume and geological history make it one of the most underrated rock formations on the continent, offering a rare glimpse into the slow-motion processes of tectonic uplift and deep crustal formation.

Next, we travel to Queensland’s Undara Lava Tubes, one of the longest and best-preserved lava tube systems in the world. Formed around 190,000 years ago during a single basaltic eruption from a scoria cone volcano, the Undara eruption unleashed over 20 billion cubic meters of lava across the landscape. As the outer crust of the lava flow cooled, molten rock continued flowing through insulated tunnels beneath—eventually draining out and leaving behind hollow tubes that stretch for tens of kilometers. These subterranean corridors are a natural archive of Australia’s volcanic past and showcase the incredible power of fire in shaping the land.

Finally, we arrive at Victoria’s iconic Twelve Apostles—towering limestone sea stacks rising from the Southern Ocean. These dramatic formations are the product of millions of years of marine erosion. Beginning in the Miocene epoch, around 15–20 million years ago, this part of Australia was submerged under a shallow sea, where layers of calcareous sediment accumulated. Over time, tectonic uplift raised the coastline, and relentless wave action began carving sea caves, arches, and eventually free-standing stacks from the limestone cliffs. The Twelve Apostles are still evolving, as erosion continues to sculpt and collapse them—reminding us that even the most majestic landmarks are temporary in the scale of geological time.

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If you enjoyed this, consider checking out our other episodes in the series.

The Oldest Cave in The World + 2 Other Oddities in Australia


What Formed This Rock 'Wave' in Australia? + 2 Other Oddities


This Australian Mountain Range Changed Science + 2 Other Oddities


The Truth About The 'Largest Rock on Earth' + 2 Other Oddities


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OzGeology is an Australian-based YouTube channel that specializes in creating high-quality documentaries on Earth sciences and natural disasters. The content is designed to be easy to digest and covers a wide range of topics, not only focusing on geology but occasionally exploring other scientific areas as well.

00:00-00:56 - Introduction
00:57-03:41 - The Largest Rock in Australia
03:42-06:44 - The Longest Lava Caves in Australia: The Undara Lava Tubes
06:45-10:01 - The 12 Apostles in Victoria
10:02-11:01 - Conclusion & Patreon / Youtube Member Thank You!