The Jinju Formation is an Early Cretaceous geologic formation in South Korea. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus. 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. It predominantly consists of black shale, with sandstone packets, deposited in a fluvial-lacustrine setting. A diverse arthropod fauna, including freshwater arthropods, spiders, and insects, is known from the formation. Other notable fossils known from the formation include several freshwater fishes, ostracods, and plants. This formation has also "attracted global ichnological attention" for the variety of important ichnofossils. Columnar and rod-shaped stromatolites have also been found here.

Fossil content

Flora

Spiders

Insects

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

Alienoptera

Blattodea

Coleoptera

Dermaptera

Diptera

Hemiptera

Hymenoptera

Odonata

Orthoptera

Raphidioptera

Neuroptera

Crustaceans

Isopoda

Ostracoda

Spinicaudata

Vertebrates

Source:

Actinopterygii

Archosauria

Mollusks

Bivalvia

Gastropoda

Ichnofossils

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