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Song Luy Formation

Song Luy Fm

Period: 
Neogene

Age Interval: 
Pliocene; N2, (24)


Province: 
South Trung Bo

Type Locality and Naming

South Trung Bo Coastal Basin. The type section is located in the valley of the Song Luy River, Ham Thuan Bac District, Binh Thuan Province (N = 1 E = 108°24’). It was named of the Song Luy River.

Synonym: Hệ tầng Sông Lũy: Lệ Đức An 1982; Nguyễn Đức Thắng et al. 1999; Trịnh Dáiih (in Vũ Khúc et al.) 2000. Hệ làng Mộ Tháp: Lô Đức An 1982; Trinh Dảnh (in Võ Khúc et al.) 2000.

Thềm Mavieck: Saurìn E. 1962. Hệ tầng phan Thiết (part.): Nguyên Ngọc 1982. Hệ tầng Mavieck: Vù Văn Vĩnh et al. 1988; Nguycn Dức Thắng et al. 1999. Các trầm lich Pỉiocen thượng - Pleistocen ha(part.): Hà Toàn Dùng. Phạm Hùng (in Vũ Khúc, Bùi Phú Mỹ et al, 1990).


Lithology and Thickness

Succession of (1). Whitc-grey, well cemented silty sandstone, 3-4 m thick. In borehole 1, at a depth of 10 to 20 m. (2). White-grey, well cemented pebble-bearing sandstone, gravelstone, 2 m thick. (3). White- to dark, medium-bedded grey claystone and sandstone, containing plant humus and, in some places, TEKTITES in their natural form, 8 m thick. The total thickness of the formation changes from 10 to 20 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Unconformably rests upon the eroded surface of intrusive and volcanic bodies of Mesozoic age (e.g., the Late Cretaceous volcanics of the Don Duong Fm and the Nha Trang Fm). Regionally, it is coeval with the Di Linh Fm of central Lam Dong province.

Upper contact

Quaternary

Regional extent

In the South Trung Bo Coastal Basin, the Upper Miocene-Pliocene sequence includes only the Song Luy Fm of Pliocene age. The Song Luy Fm occurs, in the Thanh Chau area (3 km north of Luong Son), in the valley of the Song Luy River, in the plain of the Song Mao River and in the Mo Thap. area, south of Mavieck Mt. It has also been found in Luong Son area boreholes.


GeoJSON

null

Fossils

Adiantum sp., Polypodiaceae gen. indet., Lygodium sp., Microiepia sp., Osmunda sp., Cystopteris sp., Pteris sp., Polygodium sp., Poaceae gen.indct., Lithocarpus sp., Magnolia sp., Juglans sp., Rubiaceae gen. indet., Carya sp., Larix sp., Tiliaccae gen. indet., Castanopsis sp., Rhizophora sp., etc. of Pliocenc-Pleistocene age. FlagiUaria japónica, F. constusta, Thallassiothrix sp., Th. flamenfli, Nitzschia pacifica, etc. of Late Pliocene age,


Age 

Pliocene [for graphic purposes of a composite South Trung column, placed here as late Pliocene; and early Pliocene used for the graphic of the Di Linh Fm in central Lam Dong Province]

Age Span: 

    Beginning stage: 
Piacenzian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
3.60

    Ending stage: 
Piacenzian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
2.58

Depositional setting

It is interpreted as fluvial-deltaic deposits.


Depositional pattern:  

Additional Information


Compiler:  

Tran Van Tri and Vu Khuc (Editors; Geology and Earth Resources of Viet Nam, General Dept. of Geology and Minerals of Viet Nam; completed in Dec., 2011), with additional details from Tong-Dzuy Thanh and Vu Khuc (Editors; Stratigraphic Units of Viet Nam, 2nd edition; 2011; English edited by A. Boucot).