From a book no one can decipher and puzzling disappearances to unsolved crimes and beyond, many of these historical mysteries still have us scratching our heads.
New research provides further evidence that rocks representing up to a billion years of geological time were carved away by ancient glaciers during the planet's "Snowball Earth" period, according to a study published in Proceedings of the.
A vast gap in the global geological record spanning from 1.4 billion to 1.7 billion years ago to around 500 million years ago has puzzled scientists since the late 1880s, when a member of a John Wesley Powell expedition first spotted it in the rocky layers of the Grand Canyon.A new study in the journal PNAS supports the hypothesis it was caused by glaciers.