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Sap Bon Formation

Sap Bon Fm

Period:

Permian

Age Interval:

Middle–?Late Permian (13)

Province:
Indochina Block: Loei Fold Belt

Type Locality and Naming

Khao Kwang Platform (Saraburi region): Sap Bon Teak Plantation, Bon Sok Luk and Huai Sap Tai, Muak Lek district, Saraburi province (grid ref. 400 to 420 E and 100 to130 N, sheet 47 P/FG 13, Series L-7017) (Hinthong and others, 1985). Parent unit: Saraburi Gr.

[Figure: Geological map of Saraburi Group in Saraburi area, NE Thailand (Ueno and Charoentitirat, 2011).]

Synonym: หมวดหินซับบอน

Lithology and Thickness

Grey to brown tuff sandstone, siltstone, shale and chert intercalated with grey limestone; Upper part, light grey to dark grey, thin-bedded, recrystallised limestone interbedded with light brown to rusty brown shale and siltstone. Thickness: 1,103 m

[Figure: Carboniferous and Permian facies distribution and resultant stratigraphic subdivisions on the western margin of the Indochina Block, with Saraburi Group highlighted (Ueno and Charoentitirat, 2011).]

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

Khao Khad Fm (unconformable?)

Upper contact

not mentioned

Regional extent

Phetchabun Ranges and northwest of the Khorat Plateau.

[Figure: Distribution of Carboniferous and Permian in NE Thailand. Data mainly based on 1:1 million scale geological map of Thailand (DMR 1999) with minor modiﬁcations (Ueno and Charoentitirat 2011).]

GeoJSON

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Fossils

Fusulines Pseudofusulina sp., Colania cf. douvillei and Neoschwagerina cf. margaritae and the ammonoid Agathiceras sp. by Hinthong (1981).

Age

Lower-Middle Permian (Kungurian-Kazanian) (Lexicon of Stratigraphic Names of Thailand, 2013); Middle–?Late Permian (Ueno and Charoentitirat, 2011)

Age Span:

Beginning stage:

Wordian

Fraction up in beginning stage:

Beginning date (Ma):

268.80

Ending stage:

Changhsingian

Fraction up in the ending stage:

Ending date (Ma):

254.20

Depositional setting

not mentioned

[Figure: Late Paleozoic major facies subdivisions on the western margin of the Indochina Block by Ueno and Charoentitirat (2011). (Slightly modiﬁed from Wielchowsky & Young 1985).]

Depositional pattern:

Additional Information

Remarks: This formation was previously mapped as part of the Ratburi Group (Hinthong and others, 1985).

Compiler:

Wen Du -modified from Ueno K. & Charoentitirat T., 2011, Chapter 5 Carboniferous and Permian in Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London. And Lexicon of Stratigraphic Names of Thailand of 2013