Some landscapes look permanent only because human memory is brief. Along Australia’s Great Ocean Road, the Twelve Apostles rise from the sea like old witnesses, yet science now shows they are both ancient and surprisingly young. New research has clarified how these famous limestone stacks came to stand where waves now circle them.

Researchers from the University of Melbourne reported that the rock layers themselves formed beneath shallow seas during the Miocene epoch, roughly between 14 million and 8.6 million years ago. These sediments gradually became limestone.

The study found that tectonic compression later lifted and tilted the limestone out of the ocean. Small faults visible in the cliffs today are signs of those long-past earth movements.

Yet the dramatic scenery recognized by tourists today is much more recent. Scientists say the sea stacks and cliffs largely took their present form only within the past few thousand years after sea levels rose following the last ice age.

As waves attacked fractured limestone, headlands were carved into arches. When arches collapsed, isolated pillars remained standing offshore. It is a familiar coastal process, but here it produced one of Australia’s most iconic views.

The name itself has long exceeded the number. There were not truly twelve stacks in modern times, and several have collapsed in recent decades. Erosion continues, and future changes are considered inevitable.

Scientists also describe the formations as climate archives. Layers of fossil-rich rock preserve clues about ancient seas, temperatures, and environmental change over millions of years.

There is something gentle in that lesson: stone appears still, yet keeps moving through time. Even monuments are participants in change.

The new findings give visitors and researchers a clearer story of the Twelve Apostles—lifted by tectonics, shaped by waves, and still evolving today.

AI Image Disclaimer: Some images related to this article may be AI-generated artistic interpretations of the landmark.

Sources: ScienceAlert, ScienceDaily, The Conversation