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Payang Formation
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Payang Fm base reconstruction

Payang Fm


Period: 
Neogene

Age Interval: 
Lower Miocene (2)


Province: 
Andaman Sea: Mergui Basin

Type Locality and Naming

At the Payang well between the depths of 4,430-2,420 feet. The Payang formation was first named by Nakanart and Mantajit (1983) for Upper Miocene sediments. Parent unit: Mergui Gr.

Synonym: หมวดหินป่ายาง

[Figure 1: Map of the Mergui Basin showing the main structural features including basin depocentres, based on an extensive grid of 2D seismic reflection data. (From C K Morley & A Racey, 2011)]


Lithology and Thickness

White to light grey, medium to coarse-grained, calcareous glauconitic sandstones interbedded with grey shale; abundant benthic foraminifera and shell fragments. Thickness: 603 m at the Payang well.

[Figure 2: Stratigraphy and cross-section through the Mergui Basin, Andaman Sea, based on data in Polachan & Racey (1994) and Andreason et al. (1997). (a) Oligocene–Recent stratigraphy of the Mergui Basin; (b) stratigraphy of the syn-rift section (Oligocene–early Miocene) schematically illustrating the east–west variation in stratigraphy across the basin and the effect of rift-basin highs (e.g. Central High horst block) on large-scale distribution of sedimentary facies, modified from Andreason et al. (1997); (c) east–west cross-section through the Mergui Basin illustrating the typical half-graben geometries of the basin (modified from Polachan & Racey 1994). (From C K Morley & A Racey, 2011)]


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Ranong Fm (unconformable); Yala Fm? (unconformable)

Upper contact

Surin Fm (unconformable)

Regional extent

Andaman Sea: north Mergui Basin. Correlation: Belumai Fm of North Sumatra Basin, Keutapang Fm of North Sumatra Basin.


GeoJSON

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Fossils


Age 

Lower Miocene

Age Span: 

    Beginning stage: 
Aquitanian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
21.75

    Ending stage: 
Langhian

    Fraction up in the ending stage: 
0.0

    Ending date (Ma):  
15.99

Depositional setting

Shallow marine environment which progressively deepens upwards to top.


Depositional pattern:  


Additional Information


Compiler:  

Wen Du - modified from- C. K. Morley & A. Racey, 2011, Chapter 10 Tertiary in Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London.;Lexicon of Stratigraphic Names of Thailand of 2013.