These scientists have identified three contemporaneous levels more than 12,000 years ago, on two continents yielding siliceous scoria-like objects (SLO’s),” said H. Richard Lane, program director of National Science Foundation’s Division of Earth Sciences, which funded the research. “SLO’s are indicative of high-energy cosmic airbursts/impacts, bolstering the contention that these events induced the beginning of the Younger Dryas. That time was a major departure in biotic, human and climate history.
Ted Bunch
Hard link to full and free PNAS
Cosmic Airbursts – Impacts Leave High Temperature Melt Products at Younger Dryas
https://cosmictusk.com/wp-content/uploads/Very-high-temperature-impact-melt-products-as-evidence-for-cosmic-airbursts-and-impacts-12900-years-ago.pdf