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Cam Lo Formation
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Cam Lo Fm base reconstruction

Cam Lo Fm

Period: 
Permian

Age Interval: 
P3ct, (18, 20)


Province: 
North Trung Bo

Type Locality and Naming

The Cam Lo - Mo Hai Stream section, Cam Lo District, Quang Tri Province (E = 16°47' N; E = 106°58' E). The formation bears the name of the stratotype area.

Synonym: - Hệ tầng Cam Lộ: Nguyền Xuân Dương et aí. 1977 (P2 - T1); Đoàn Nhật Trường (Phạm Kim Ngân et al. 1995 - P2). - Permìen de Cam Lo: Trần Thị Chí Thuần, 1962. - Hệ tầng Cam Lộ (part.): Nguyẽn Văn Hoành et al. 1985; Vũ Khúc, Bùi Phú Mỹ et al. 1990 (Pj). - Loạt Bắc Sơĩì, phần trên: Nguyễn Văn Liêm, 1978 - Hệ ìớp đá phiến Cam Lộ chửa tập hợp Leptodus: Phan Cự Tiến et al. 1986 (P2)


Lithology and Thickness

Claystone: and Marl: Stratotype is (1). Carbonaceous shale, ycllowish-grey clayey shale interbedded with greyish-violet sandstone and siltstone, some poorly preserved plant remains were found in the carbonaceous shale. 140 m thick. (2). Dark grey marly shale with thin lenses of black-grey limestone interbedded with greenish- grey, yellowish-grey clayey shale containing secondary limonite and ferruginous concretions, 60 m thick. The total thickncss of the formation in this section is about 200 m.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Unconformably upon the Upper Silurian Dai Giang Fm in type section. Regionally, the next older unit is the Bac Son Fm.

Upper contact

Its boundary with younger units is unknown. Next younger regional unit is the Dong Trau Fm volcanics of Anisian.

Regional extent

Uncertain extent within Quang Tri Province.


GeoJSON

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Fossils

Waagenites wongiana, w. soochowensis, Leptodus nobilis, Transennatia graciosa, T. cf. margaritata, Spinomarginifera Icueichowensis, Uncinunellina jabiensis.


Age 

Wuchiapingian age on the basis of the above brachiopod fossils. [Shown on strat chart as early Wuchiapingian.]

Age Span: 

    Beginning stage: 
Wuchiapingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
259.55

    Ending stage: 
Wuchiapingian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
256.89

Depositional setting


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).