Home Multi-Country Search About Admin Login
Cenozoic
Mesozoic
Late Paleozoic
Early Paleozoic
Neoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Ta Not Formation
Click to display on map of the Ancient World at:
Ta Not Fm base reconstruction

Ta Not Fm

Period: 
Permian

Age Interval: 
Wuchiapingian, P3in, (25, 26)


Province: 
East Nam Bo

Type Locality and Naming

Lectostratotype: Prek Lovia section extending along the upstream part of the Song Sai Gon River, 1 km from the Prek Lovia mouth (E = 11°50’, E = 106°28'), Loc Ninh District, Binh Phuoc Province.

Synonym: Hệ tầng Ta Nốt: Nguyễn Xuân Bao (Nguyền Ngọc Hoa et al. 1996); Ma Công Cọ et al2001 (Permi muộn). Hệ tầng Tà Thiết (part): Bùi Phú Mỹ et al. 1986 (Permi muộn); vo Khúc, Bùi Phú Mỹ et al. 1990 (Permi muộn); Nguyễn Ngọc Hoa et al 1991; Nguyễn Xuân Bao et al. 1994 (Permi muộn)


Lithology and Thickness

Sandstone and Claystone. The stratotype can be divided into two parts - the Lower includes sandstone, gritstone, thin interbeds of carbonaceous shale, and thin beds or lenses of polymictic conglomerate with poorly sorted and rounded pebbles. The Upper part is composed mainly of grey, dark grey clayey shale, siltstone, and fine-grained sandstone. The total thickness of the section reaches about 300 m (Nguyen Ngoc Hoa et ai 1991).


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The stratigraphic relation of the formation with the underlying units is not observed in the stratotype. No older units of Paleozoic age are reported in this region.

Upper contact

Conformably underlies the Ta Vat Fm (= Hon Quan Fm).

Regional extent

The exposures of the formation arc limited and scattered extending in the Ta Not, Ta Thiet and Tong Le Tru areas of the upstream Song Sai Gon basin.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[105.72,12.01],[106.77,12.72],[106.82,12.66],[106.99,11.81],[106.97,11.62],[106.92,11.46],[106.82,11.43],[106.69,11.37],[106.24,11.63],[105.93,11.93],[105.72,12.01]]]]}}

Fossils

Abundant fossils were found in the dark grey shale, and include the brachiopods Streptorhynchus cf. pelargonatus, Uncinunellina aff. timorensis, Chonemineỉỉa sp., Waagenoconcha cf. monpellierensis, Waagenites (?) sp., and the bivalves Girtypecten sp., Perdopecten sp., Palaeolima sp.


Age 

Above cited fossiis consist mainly of Late Permian species, which were met with in the Upper Permian of South China, Laos, Cambodia, and in other regions of Viet Nam; for this reason the late Permian age assignment of the Ta Not Formation is convincing.

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: 
1.0

    Ending date (Ma):  
254.24

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).