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Khao Khad Formation

Khao Khad Fm

Period:

Permian

Age Interval:

Early-Middle Permian (13)

Province:
Indochina Block: Loei Fold Belt

Type Locality and Naming

Khao Kwang Platform (Saraburi region): Khao Khad, Phra Phuttabat district, Saraburi province by Hinthong and others (1985). Parent unit: Saraburi Gr

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

Synonym: หมวดหินเขาขาด

Lithology and Thickness

Very dark grey to black limestone, re-crystallized and argillaceous limestone and dolomite, nodular and bedded chert intercalated with shale and sandstone, locally marble and calcsilicate rocks. Thickness: 1,812 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 limestone

Relationships and Distribution

Lower contact

not mentioned

Upper contact

Sap Bon Fm (unconformable?)

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

Age

Lower Permian (Artinskian-Kungurian) by Hinthong and others (1985), Lower-Middle Permian (Asselian to Capitanian) by Thambunya (2005), Early-Middle Permian by Ueno and Charoentitirat (2011).

Age Span:

Beginning stage:

Artinskian

Fraction up in beginning stage:

Beginning date (Ma):

290.06

Ending stage:

Wordian

Fraction up in the ending stage:

Ending date (Ma):

268.80

Depositional setting

Shallow marine environment

[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