The Port Askaig Formation provides the first conclusive evidence of the transition from a tropical Earth to a frozen one 717 million years ago.
The unique outcrop reveals a timeline from a warmer era, offering a relatively complete record of the global Sturtian glaciation.
Found in the Scottish islands, this evidence is significant as other rocks from the same period lack this transitional data due to ancient glaciers.
A sudden decrease in solar radiation is hypothesized as the cause for Earth’s dramatic transition into a deep freeze.
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