Jinju Formation
Early Cretaceous geologic formation in South Korea / From Wikipedia, the free encyclopedia
The Jinju Formation (Korean: 진주층; Hanja: 晋州層; RR: Jinju-cheung) is an Early Cretaceous geologic formation in South Korea.[1] Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[2] 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.[3] It predominantly consists of black shale, with sandstone packets, deposited in a fluvial-lacustrine setting.
Jinju Formation | |
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Stratigraphic range: Albian ~112.4–106.5 Ma | |
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 / 35.1; 128.1 |
Approximate paleocoordinates | 44.3°N 122.7°E / 44.3; 122.7 |
Region | North Gyeongsang Province |
Country | South Korea |
Extent | Gyeongsang Basin(ko:경상 분지) |
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.[4] 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.[5] Columnar and rod-shaped stromatolites have also been found here.[6]