Expedition Update · Nanjing
Chinese Academy of Sciences identified colored flint cobblestone strata in Yuhuatai formation:
Scientific Value:
Black pebbles with 24% troilite (global first) confirm 75-million-year-old meteor impact
Red-yellow color gradients reveal paleoclimate shifts (17% Fe₂O₃ fluctuation)
Conservation:
500m² core zone established; limited research collection (<1 ton/year) post 3D scanning