https://www.forbes.com/sites/davidbressan/2024/11/10/scientists-solve-riddle-of-worlds-best-preserved-dinosaurs/ QT:{{” The Yixian Formation, a 120 to 130 million-year-old geological formation outcropping in the Liaoning Province in northeast China, for more than 20 years has produced exceptionally preserved fossils of insects, plants, shells, fish and several hundred skeletons of feathered dinosaurs. “}}