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Sibaing Orthoquartzite Formation
Click to display on map of the Ancient World at:
Sibaing Orthoquartzite Fm base reconstruction

Sibaing Orthoquartzite Fm

Period: 
Cambrian

Age Interval: 
early Late Cambrian


Province: 
Myanmar Shan Region

Type Locality and Naming

Shan Mid Plateau, (Pyin Oo Lwin), The type section of the unit is designated as in Si-baing Chaung, approximately 8 km west of Ngwetaung peak, 29 km north of Sedaw railway station, Patheingyi township, Mandalay division. This unit is 684 m thick in its type section, and is fairly widely distributed in Patheingyi and Pyin-Oo-Lwin townships near Sedaw Chaung, Dattaw Chaung and west of the Ngwetaung range, NE of Sedawgyi and the Leikkya-Thandaung area. La Touche (1913) first described this unit as the Ngwetaung Sandstone Fm; it was later termed the Pangyun Beds by Brown (1918) and informally the Sibaing Orthoquartzite Fm in an unpublished MSc thesis by Hla Myint, but the name was published by Aye Ko Aung (2012). [Original Publication: Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 317-342]


Lithology and Thickness

Sandstone. The Sibaing Orthoquartzite consists mainly of thick-bedded to massive, greyish-white and purple orthoquartzite with ripple marks and cross-bedding. Some ferruginous, micaceous sandstone, phyllite and conglomerate are found as minor rock types near the base of the unit at a locality east of Sedawgyi.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It overlies the Chaung Magyi Gr unconformably.

Upper contact

It underlies conformably the Taunggyun Sandstone Fm

Regional extent

This Fm is developed in Shan mid-Plateau. The unit is correlatable with the ‘Pandung Fm’ (Myint Lwin Thein 1973) of the Shan State South and partly with the Pangyun Fm (La Touche 1913) of Shan State North. In the predominance of ripple mark-bearing orthoquartzite, this unit is similar to the Jerai Fm (Bradford 1972) of Perlis and Kedah in mainland Malaysia (Cocks et al. 2005; Lee 2009) and the Tarutao Group of southern Thailand (Wongwanich et al. 2002; Ridd 2011).


GeoJSON

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Fossils

No fauna has been found, but the orthoquartzite underlies the saukiid trilobite-bearing Late Cambrian Taunggyun Sandstone Fm.


Age 


Age Span: 

    Beginning stage: 
Drumian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
504.50

    Ending stage: 
Guzhangian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
497.00

Depositional setting

The orthoquartzite represents a shallow-marine barrier beach environment.


Depositional pattern:  


Additional Information


Compiler:  

Aye Ko Aung and L. Robin M. Cocks (Aung & Cocks, Cambrian–Devonian stratigraphy of the Shan Plateau, Myanmar (Burma), Chapter 14 in Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 317-342).