New Discovery Could Help Us Find History’s Missing Star Dunes : ScienceAlert
For several decades, scientists have wondered why giant star-shaped sand dunes found across many modern deserts don't appear in geological records.To date, the count stands at one that grew more than 250 million years ago in what is now north-east Scotland. The fact no others have been found is something of a surprise given they can now be found across Africa, Arabia, China, and North America, and even on extraterrestrial deserts on Mars and Saturn's moon Titan.A new study now offers up a possible explanation: that we…