Jinju Formation
The Jinju Formation (Korean: 진주층; Hanja: 晋州層; RR: Jinju-cheung) 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.
| Jinju Formation | |
|---|---|
| Stratigraphic range: Albian ~ | |
| Type | Geological formation |
| Unit of | Shindong Group |
| Underlies | Chilgog Formation, Iljig Formation |
| Overlies | Hasandong Formation |
| Thickness | 1,000–1,800 m (3,300–5,900 ft) |
| Lithology | |
| Primary | Shale |
| Other | Sandstone |
| Location | |
| Coordinates | 35.1°N 128.1°E |
| Approximate paleocoordinates | 44.3°N 122.7°E |
| Region | North Gyeongsang Province |
| Country | South Korea |
| Extent | Gyeongsang Basin(ko:경상 분지) |
Jinju Formation (South Korea) | |
A diverse spider fauna is known from the formation, including indeterminate mygalomorphs and palpimanoids as well as two species of lagonomegopid belonging to the genera Koreamegops and Jinjumegops. Other compression fossils known from the formation include a species of the zhangsolvid fly Buccinatormyia, the elaterid beetle Koreagrypnus, and the ichthyodectiform fish Jinjuichthys. This formation has also "attracted global ichnological attention" for the variety of important ichnofossils. Columnar and rod-shaped stromatolites have also been found here.