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Jinju Formation
Early Cretaceous geologic formation in South Korea From Wikipedia, the free encyclopedia
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The Jinju Formation (Korean: 진주층; Hanja: 晋州層; RR: Jinju-cheung), also known as the Dongmyeong Formation (Korean: 동명층; Hanja: 東明層; RR: Dongmyeong-cheung) in some literature is an Early Cretaceous geologic formation in South Korea.[2] Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[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.
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.[5] Columnar and rod-shaped stromatolites have also been found here.[6]
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Fossil content
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Plants
Spiders
Insects
Odonata
Dermaptera
Orthoptera
Dictyoptera
Hemiptera
Hymenoptera
Raphidioptera
Neuroptera
Coleoptera
Diptera
Crustaceans
Isopoda
Ostracoda
Ostracods of the Jinju Formation[37][38] | ||||||
---|---|---|---|---|---|---|
Genus | Species | Region | Member | Material | Notes | Image |
Scabriculocypris | S. yanbianensis | Jeongcheon | ||||
Cypridea |
|
C. jinjuria in Gwanghyeon | ||||
Mongolocypris | M. kohi[40] | |||||
Lycopterocypris | L. cf. celsa | Jeongcheon | ||||
Candona | C. sp. | |||||
Djungarica | D. sp. | Jeongcheon | ||||
Rhinocypris | R. sp. | Previously assigned to as Ilyocypris sp. |
Spinicaudata
Vertebrates
Source:[42]
Actinopterygii
Archosauria
Mollusks
Bivalvia
Gastropoda
Ichnofossils
Unnamed ichnofossils from the Jinju Formation include Ornithopod tracks and Caddisfly bioherms.[6]
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See also
References
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