#murrayriver #australia #inlandsea
Today, the Murray River flows through some of the most iconic landscapes in Australia. It winds past towering cliffs, vineyards, floodplains and red-earth country before eventually reaching the Southern Ocean. To most people, it is simply a river. But hidden within the rocks that surround it is evidence of a forgotten world. Millions of years ago, large parts of southeastern Australia lay beneath a shallow sea.
In this video, we travel back through deep time to explore the Murray Sea, an ancient marine environment that once flooded vast areas of the Murray Basin. During the Oligocene and Miocene epochs, rising sea levels and long-term subsidence allowed ocean waters to advance deep into what is now South Australia, Victoria and New South Wales. Areas that are now farmland, river valleys and semi-arid landscapes were once submerged beneath shallow marine waters connected directly to the Southern Ocean.
Discover how this remarkable marine incursion transformed southeastern Australia and created an ecosystem unlike anything that exists in the region today. Learn how marine organisms such as molluscs, sea urchins, bryozoans and countless microscopic creatures thrived within the Murray Sea, leaving behind an extraordinary fossil record that can still be studied millions of years later. Explore the geological evidence preserved within the Murray Basin, including fossil-rich sediments, marine limestones, marls and carbonate deposits that reveal the presence of a vanished ocean.
This documentary examines the formation of the Murray Basin, the geological processes that allowed the sea to spread inland, and the environmental conditions that existed across southern Australia during the Miocene. We investigate how carbonate sediments accumulated on the seafloor, how ancient marine ecosystems evolved, and why the Murray Sea is considered one of the most significant chapters in Australia's geological history.
The story of the Murray Sea is also the story of a changing planet. As Antarctica became increasingly glaciated and global climates cooled, sea levels began to fall. The ocean gradually retreated from the Murray Basin, exposing former seafloors and paving the way for the landscapes that would eventually become the Murray-Darling Basin. The disappearance of the Murray Sea marked a major turning point in the geological evolution of southeastern Australia and set the stage for the next chapter in the region's history.
This episode is the first part of a series exploring the ancient waters that shaped southeastern Australia. In future episodes, we will investigate the incredible marine life that inhabited the Murray Sea, including discoveries that are changing our understanding of whale evolution, before exploring the story of Lake Bungunnia, a gigantic freshwater lake that later occupied much of the Murray Basin and helped create the modern landscapes of the Murray-Darling region.
The rocks remember a time before the Murray River. A time before the modern Australian landscape. A time when an ancient sea stretched across southeastern Australia and transformed the continent forever.
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The core mission of OzGeology is to make geology exciting, accessible, and inspiring for everyone. Instead of presenting rocks and earth science as dry or overly academic, OzGeology brings stories of the planet to life, revealing how every mountain, mineral, and landscape tells part of Earth’s grand adventure. The goal is to help people see the world differently, to understand the dynamic forces shaping Australia and beyond, and to spark curiosity in the next generation of geologists. Through engaging storytelling, field exploration, and clear explanations, OzGeology turns the study of our planet into a journey of discovery rather than a classroom lecture.
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