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Sookpraiwan Formation

Sookpraiwan Fm

Period:

Triassic

Age Interval:

Early and Middle Triassic (12)

Province:
SE Thailand: Klaeng Zone

Type Locality and Naming

Named after Khao Wat Sookpraiwan (also spelled Suk Phrai Wan) beside the Rayong–Chanthaburi road 15 km east of Klaeng), Rayong Province, SE Thailand (Sukhothai Zone extension). The Khao Wong Fm is equated with it; and it has its type section at Khao Wong, Tha Mai district, Chanthaburi province.

Synonym: หมวดหินสขุ ไพรวัน , Sukpaiwan Fm, Khao Wong Fm, Khao Wong Limestone Fm

[Figure 1 : Generalized distribution of different Triassic sedimentary environments and some of the more important lithostratigraphic units, and their relations to the terranes. (The geology of Thailand, 2011) page 146]

Lithology and Thickness

It consists of grey, dark-grey and violet brown limestone, medium to thick-bedded, common with ooids, peloids and bioclasts, intercalated with shale.. More than 100 m thick.

At Khao Wat Suk Phrai Wan, c. 15 km east of Klaeng (Klaeng Zone; Sukhothai tectonic zone extension), this formation starts with reddish-purple lithic sandstone and shale with distinctive slaty cleavage. This is overlain by slightly sandy limestone with red mudstone clasts, followed by bedded ‘oncolitic’ limestone.

The coeval Khao Wong Fm is a similar limestone, massive to bedded, grey to grayish black, with oncoids, and interbedded shale.

Lithology Pattern:

Oolitic limestone

Relationships and Distribution

Lower contact

Overlies the Wat Khao Hin Limestone Fm in the Khao Chamao section (20 km ENE of Klaeng in eastern Rayong Province).

Upper contact

Noen Po Fm (conformably)

Regional extent

Rayong-Chanthaburi Basin area (near the Gulf of Thailand), SE Thailand (Sukhothai Zone extension; and Loei Fold Belt extension – separated by Sa Kaeo Suture).

[Figure 2 : Generalized distribution of marine Triassic sedimentary rocks in Thailand (in purple) (modiﬁed after Mantajit 1999). (The geology of Thailand, 2011) page 138]

GeoJSON

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Fossils

Foraminifera Meandrospira pusilta Ho, Glomospira tenuiﬁstula Ho and the alga Aeolissacus tintinniforis Misik. At Klaeng exposure, it yields late Early–Middle Triassic (Spathian to Ladinian) foraminifers.

Age

Scythian–Ladinian (Scythian is an older term for the entire Early Triassic). Implied by Fig. 6.2 in Chonglakmani (2011) to span approximately the Induan through early Ladinian.

Age Span:

Beginning stage:

Induan

Fraction up in beginning stage:

Beginning date (Ma):

251.90

Ending stage:

Ladinian

Fraction up in the ending stage:

0.5

Ending date (Ma):

239.25

Depositional setting

Shallow-marine

Depositional pattern:

Additional Information

Compiler:

Wen Du - modified from- Chonglakmani, C.P., 2011, Chapter 6 Triassic in Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London.