[3] The depositional age of this formation spans from approximately 112.4 ± 1.3 to 106.5 million years ago (early Albian) based on detrital zircon U-Pb dating.

[4] It predominantly consists of black shale, with sandstone packets, deposited in a fluvial-lacustrine setting.

Other notable fossils known from the formation include several freshwater fishes, ostracods, and plants.

[6] Jinju formation consists of a diverse order of insects: Orthoptera, Homoptera, Mantodea, Diptera, Coleoptera, Hymenoptera, Dermaptera, Neuroptera, Blattoidea, Hemiptera, Odonata, Mecoptera, etc.

Unnamed ichnofossils from the Jinju Formation include Ornithopod tracks and Caddisfly bioherms.