Cenozoic

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Triassic

Permian

Carboniferous

Devonian

Early Paleozoic

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Fang Red-beds Formation

Fang Red-beds Fm

Period:

Carboniferous

Age Interval:

Late Carboniferous (provisional assignment) (8)

Province:
NW Thailand – Inthanon Zone

Type Locality and Naming

NW Thailand, north of Mae Ping Fault. Type locality: locally exposed along the Chiang Mai – Fang Highway (Route 107) about 40 km south of Fang in northern Chiang Mai Province.

Synonym: หมวดหินเรดเบดฝาง

[Figure: Distribution of Carboniferous and Permian strata in Northern Thailand. Data mainly based on 1:1 million scale geological map of Thailand (DMR 1999) with minor modiﬁcations (Ueno K. & Charoentitirat T., 2011, page 75.)]

Lithology and Thickness

Thick conglomerate and interbedded conglomeratic sandstone grading to sandstone and shale. The conglomerate is well-sorted consisting of rounded to sub-rounded pebbles of chert, quartzite, slate and some limestone. Thickness: 200 m

Lithology Pattern:

Aus conglomerate

Relationships and Distribution

Lower contact

The chert clasts are probably derived from the Fang Chert, which is unconformably overlain by the Fang Red-beds.

Upper contact

Regional extent

Northern Region: Chiang Mai province. Correlation: Doi Kong Mu Fm.

GeoJSON

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Fossils

Age

Late Carboniferous (provisional assignment). Relative ages for Mae Tha Fm, Fang Red-beds Fm and Doi Kong Mu Fm are arbitrary, because contacts are not known; and these may be coeval facies variations to some extent. Ueno and Charoentitirat (2011) suggested the Fang Red-beds formation’s age should be younger, because the chert clasts may be derived from the Fang Chert Fm, "for which there is now evidence of a Devonian to Triassic age."

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

314.60

Ending stage:

Kasimovian

Fraction up in the ending stage:

0.0

Ending date (Ma):

306.65

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Wen Du - modified from Katsumi Ueno & Thasinee Charoentitrat, 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.