SANDS OF TIME REVEAL EARTH’S PAST

Scientists have uncovered the secret behind the age of the largest sand dunes on Earth. This groundbreaking study marks the first time researchers have been able to determine the age of star dunes, some of the most massive and intricate sand formations that can reach heights of hundreds of meters. Star dunes, named for their star-shaped appearance, are found in various locations across Africa, Asia, North America, and even on Mars. The study revealed that the dune known as Lala Lalle in Morocco was formed around 13,000 years ago.

Star dunes are sculpted by opposing winds that constantly shift direction, shaping the unique structures over time. By understanding the age of these dunes, scientists can gain valuable insights into past climates and wind patterns. Professor Jeff Daller from the University of Abiristuite, who co-authored the study with Professor Charles Bristow from the University of Birkbek, emphasized the significance of unraveling the age of these dunes in shedding light on the ancient climate conditions.

Situated in the sandy desert Erg Shebbi in southeastern Morocco, the dune Lala Lallia, meaning the “Higher Holy Point” in the local Amazig language, stands at a height of 100 meters and spans 700 meters in width. After an initial period of stability for about 8,000 years, the dune experienced rapid growth in recent millennia, expanding its size significantly.

These star-shaped dunes have remained absent from Earth’s geological history due to their massive proportions. Professor Daller suggested that previous researchers may have failed to recognize them as individual dunes. The new findings regarding the rapid formation and movement of these immense dunes, such as the Lala Lallia, traveling at a speed of approximately 50 cm per year, have the potential to astonish many.

The age of the star dune was determined using a dating technique known as Luminescence dating, which allows researchers to pinpoint the last time sand grains were exposed to sunlight. This analysis was conducted in a laboratory setting under dim red light conditions, resembling that of an old