Deciphering the Early Cretaceous transgression in coastal southeastern China: Constraints based on petrography, paleontology and geochemistry

► The K1 marine transgression event in coastal SE China was studied thoroughly. ► Evidence includes limestone/mudstone petrography, paleontology, δ13C and biomarker. ► The transgression time is from 119 ± 3 Ma to 99 ± 3 Ma based on zircon U-Pb dating. ► The northern boundary is approximately 29° N, while the western is southeastern Wuyi Mountains.