A recently discovered occurrence of the K/Pg (aka K/T) boundary on Gorgonilla Island off the west coast of Colombia is the first one of its kind in South America and provides new insights into the end-Cretaceous mass extinction in a deep sea environment. The small island features a layer of unusually fresh, glassy spherules – impact-produced and ejected impact melt droplets – which Paul Renne (Berkeley Geochronology Center) and his team have convincingly linked to the Chicxulub impact on Mexico’s Yucatán Peninsula 66.04 million years ago. READ MORE »