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Di Linh Formation

Di Linh Fm

Period: 
Neogene

Age Interval: 
Pliocene; N1, (24)


Province: 
South Trung Bo

Type Locality and Naming

Central Lam Dong Province (Lam Dong Basin). The type section is established along Highway No.20 in the Bao Loc - Di. Linh area (N = 11°37’; E = 108°08). It was named as two “suites” Bao Loc and Di Linh bearing the names of townlets in Lam Dong Province.

Synonym: Hệ tầng Di Linh: Trần Dức Lương, Nguyền Xuân Bao et al. 1988; Trịnh Dánh (in Phan Cự Tiến et al.) 1989; (in Vũ Khúc, Bùi Phú Mỹ et al,) 1990; (in Vũ Khúc et al.) 2000; Nguyễn Đức Thắng et al. 1999 (Neogen). Điệp Bao Lộc + điệp Di Linh: Trịnh Dánh (in Vũ Khúc và nnk.) 1984; Trịnh Dánh 1985, 1993.


Lithology and Thickness

Characterized by bentonite-bearing beds. Dai Hiep region: (1). Ash-grey, medium- to coarse-grairied quartz sandstone and siltstone with two interbeds of compact basalt, 6-20 m thick. (2). Coal-bearing (Bao Loc area) or bentonite-bearing (Di Linh area) member including greyish sandstone, grey siltstone, carbonaceous shale, brown coal or bentonite, 50-60 m thick. (3). Quartz gritstone containing some grains of chert grading upward into greenish-grey, massive, well-sorted but poorly rounded sandstone with interbeds of bentonite; 4-5 m thick. (4). Greenish-grey, motley-colorcd, very soft when moistened, with some interbeds of fine-grained sandstone, grading upward into white-grey claystone interbedded with grey to white-grey bentonite; 50-60 m thick. The total thickness of the formation in this scction is 110-145 m.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Unconformably rests upon the Bao Loc Fm of late Miocene.

Upper contact

Quaternary.

Regional extent

The Di Linh Fm occurs in the Di Linh, Bao Loc, valley of Da Dung River, Due Trong and Da Lat areas of Lam Dong Province. Coeval with the Song Luy Fm on the coast of South Trung Bo.


GeoJSON

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Fossils

Cinnamomum polymorphum, Laurus similis, Persea indica, Litsea sp., Ficus beauveriei, Diospyros brachysepala, Quercus cf. haugi, Qu. cf. incana, Dipterocarpus symmetriaefolius, Phragmites oeningensis, Typha latissima, Shorea aff. cochinchinensis, Anacolosa sp.; an abundant palynological assemblage of 52 sporomorphs, and Diatoms with Melosira praegranulata, M. italic.


Age 

Pliocene [for graphic purposes of a composite South Trung column, placed here as early Pliocene; and late Pliocene used for the graphic of the Song Luy Fm in the coastal basin]

Age Span: 

    Beginning stage: 
Zanclean

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
5.34

    Ending stage: 
Zanclean

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
3.60

Depositional setting

It is interpreted as a


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).