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Hon Heo Formation
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Hon Heo Fm base reconstruction

Hon Heo Fm

Period: 
Devonian

Age Interval: 
D?, hh, (28, 29)


Province: 
West Nam Bo

Type Locality and Naming

Hon Trcm Cape, Hon Chong Harbour, Ha Tien coastal area (E = 10°11'; E = 104°31'). The name of the formation is that of an island belonging to the Ba Lua Archipelago, Gulf of Thailand, Kien Giang Province.

Synonym: Fm de Hon Heo: Fontaine H. 1969 (Antépermien). Hệ tầng Nam Du (part.): Nguyễn Kinh Quốc eial. 1981; Vũ Khúc, Bùi Phú Mỹ et al. 1990 (Silurian - Devonian). Hệ tầng Hòn Heo: Nguyễn Ngọc Hoa et al. 1991 (D); Trương Công Đượng et al. 1997 (D2 -Da); Nguyễn Hữu Hùng (Trịnh Dánh et al. 199S, D?); Tống Duy Thanh, Nguyễn Đức Khoa (in Vũ Khúc et al. 2000 - D). Hệ tầng Hòn Chóng (part.): Nguyễn Xuân Bao et al. 1994; Nguyễn Ngọc Hoa et al. 1996 (D - C1)


Lithology and Thickness

Organic-rich claystone: Black, carbonaceous shale with interbed thickncss varying from 10 to 20 cm, containing many spores. The total thickness of the formation in this section is 450 m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Upper contact

It has unclear or tectonic contact with other formations. Regionally, the next younger unit is the Ha Tiem Fm of Early Permian age.

Regional extent

In the part of the scction situated near the Hon Trem Cape almost all the beds dip 60-75°, plunging southeastwards. In the part of the scction extending from the Doi Xanh Hotel to Hon Chong Harbour the attitude of the beds changes continuously, plunging mainly southeastwards and northwestwards; and in the last part of the section the beds plunge northwestwards with the dip changing from 25 to 75°, locally up to nearly 90°.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[103.86,12.09],[104.22,11.81],[104.38,11.69],[104.84,11.24],[104.97,10.91],[104.97,10.56],[104.89,10.18],[104.61,9.79],[104.09,9.49],[103.7,9.46],[103.39,9.44],[103.13,9.56],[103.86,12.09]]]]}}

Fossils

Leiotriletes sp., Laevigatosporites sp. Baiera, Ginkgo


Age 

The Hon Heo Fm is supposedly referred to the Devonian. Due to inadequate study of Paleozoic spores in Viet Nam, the beds on the other side of the Hon Heo Fm are strongly folded and could contain intercalations of a younger formation, the dating of the Hon Heo Fm is still disputed. At present, the Hon Heo Fm is supposedly referred to the Devonian. [Assigned here as only early Devonian, which is the age of the Devonian preserved in Middle Trung Bo .

Age Span: 

    Beginning stage: 
Lochkovian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
419.00

    Ending stage: 
Eifelian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
385.30

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).