Geologists explain billion-year gaps in Earth's geological record

A study published in the journal Nature has proposed an explanation for the disappearance of hundreds of millions of years from the Earth's geological record. This phenomenon, known as the Great Unconformity, involves instances where geological formations rest upon much older materials, leaving a massive gap in the chronological history of the planet's surface.

Researchers Santosh Dhungana and Nicolas Flament from the University of Wollongong suggest that the cause of these gaps lies thousands of kilometers below the surface. They argue that movements within the Earth's mantle, which shift continental positions over vast timescales, are responsible. The study posits that the rising and subsequent sinking of massive continental masses created the specific conditions required to erase or preserve fragments of geological history.

While famously observed in the Grand Canyon in the United States, evidence of these gaps exists in Europe, Asia, and other regions, with some voids exceeding 1,000 million years. The research also considers the impact of ancient glaciations, such as the Cryogenian period approximately 720 million years ago, which contributed to the planet's transformation.