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Pang Asok Formation

Pang Asok Fm

Period:

Permian

Age Interval:

Early–?Middle Permian (13)

Province:
Indochina Block: Loei Fold Belt

Type Locality and Naming

Khao Kwang Platform (Saraburi region): Pang Asok village, nearby Pang Asok railway station, grid ref. 550 to 560 E and 220 to 226 N (Hinthong and others, 1985). Parent unit: Saraburi Gr.

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

Synonym: หมวดหินปางอโศก

Lithology and Thickness

Lower part: greenish-grey to pale reddish-brown sandstone, intercalated with shale, pale reddish-brown shale, interbedded with light greenish grey arkosic sandstone, pale reddish-brown shale, intercalated with brownish-grey limestone; Middle part: mostly grey to greyish-brown shale; Upper part; brown to dark grey slate, slaty shale, intercalated with greenish-grey lenticular arkosic sandstone. Thickness: 366 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

not mentioned

Upper contact

not mentioned

Regional extent

in the Saraburi area of Loei-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

Bivalves and poorly preserved plant leaves occur, which are thought to indicate an Early Permian age (Hinthong, 1981).

Age

Lower Permian (Artinskian-Kungurian) (Lexicon of Stratigraphic Names of Thailand, 2013); Early–?Middle Permian (Ueno & Charoentitirat, 2011)

Age Span:

Beginning stage:

Artinskian

Fraction up in beginning stage:

Beginning date (Ma):

290.06

Ending stage:

Roadian

Fraction up in the ending stage:

Ending date (Ma):

272.30

Depositional setting

marginal-marine siliciclastic facies

[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

This formation is also largely time-equivalent to the Phu Phe Fm, Khao Khad Fm and Khao Khwang Fm and probably represents a marginal-marine siliciclastic facies of the Khao Khwang Platform (Ueno & Charoentitirat, 2011).

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