Dray Linh Fm
Type Locality and Naming
Initially the formation stratotype was designated in the Dak Krong River, on the section situated downstream from the Dray Linh hydroelectric dam, in the Da Lat Depression.
Synonym: Dak Krong Fm (used by Dzuy Thanh and Vu Khuc, 2011); Hệ tầng Đăk Krông: Vũ Khúc, Nguyễn Vĩnh, Đỗ Công Dự (in Vù Khúc et al. 2000); Ma Công Cọ et al. 200i. - Schistes de Trian: Mansuy H. 1914. - Hệ tầng Dray Linh'. Nguyễn Xuân Bao, Nguyễn Ngọc Hoa et al. 1990; Vũ Khúc (part.)1993; Trần Tính et al. 1998; Nguyẻn Đức Thắng et ai. 1999. - Diệp Dray Linh (part.): Vũ Khúc et al. 1983; Vũ Khúc et al. 1984, 1986.
Lithology and Thickness
The characteristic section (lectostratotype) exposed along the Dak Hua Stream, in the section where it leaves the Chu Klin Range and extends into the northern area of the Ban Don Plain with a thickness of 1400 m. Three members in this section: (1). Basal conglomerate to massive quartz gritstone and sandstone, 320 m thick, containing ammonites of the Sinemurian family Arietitidae and the bivalves Cardinia concinna, C. aff. orbicularis. (2). Gray, thin-bedded siltstone and calcareous sandstone, 494 m thick, yielding the Pliensbachian ammonite Dactylioceras sp. and various bivalves. (3). Black-grey calcareous siltstone, containing many calcareous concretions with interbeds of calcareous sandstone, 586 m thick, containing the Toarcian ammonite, Dumortieria lantenoisi and bivalves Parvamussium donaiense, Myophorella saurini.
Relationships and Distribution
Lower contact
Disconformably overlies Middle Triassic (late Anisian) of the Chau Thoi Fm (East Nam Bo) or Mang Yang Fm (South Trung Bo; Middle Trung Bo).
Regional extent
It occurs in two main, large bands: one on the northern margin of the depression, extending from the Buon Ea Sup, Ban Don, Dray Linh, east Buon Ho through Krong Pach to Ninh Hoa, Hoa Huynh, Da Ban areas; one on the south, extending from Loc Ninh, Song Be through Chau Thoi Mt, following the Dong Nai River to the Trj An, Lo Due areas, then plunging beneath the Quaternary cover in the Ba Ria area.
GeoJSON
Fossils
Sinemurian through Toarcian ammonites and bivalves. See lithologic description.
Age
Depositional setting
Marine clastic-shelf
Additional Information