Thung Yai Gr

Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Early Paleozoic

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Thung Yai Gr

Period:

Jurassic, Cretaceous

Age Interval:

Lower Middle Jurassic- Upper Cretaceous (3)

Province:
Sibumasu: Lower Peninsula

Type Locality and Naming

Laem Pleo, Khlong Thom district, Krabi province; Khao Sam Chom and Khao Nam Daeng east of Khlong Min; km 10 on the road no 4038 from Lam Thap to Khlong Thom. This group was originally named Trang Gr (Raksaskulwong, 1994; Teerarungsigul and others, 1999). Raksaskulwong (2002) introduced the Thung Yai Group to replace the Trang Group, as the “Trang Fm” has been used for Neogene sequences.

Synonym: กลุม่หินทุง่ใหญ; , Trang Gr

[Figure: Geological map of the Thung Yai Gr in Khlong Thom-Bang Khan area, Peninsular Thailand (Meesook, 2011)]

Lithology and Thickness

Reddish brown shale and sandstone, conglomerate.

Subdivisions: Raksaskulwong (1994) formerly subdivided Trang Group into 4 formations, upward: Chumphon red beds Fm, Khlong Min Fm, Sam Chom Fm, and Phun Phin Fm. Teerarungsigul and others (1999) subdivided it into 4 formations, upward: Khlong Min Fm, Lam Thap Fm, Sam Chom Fm, and Phun Phin Fm. Total thickness: 760 m.

[Figure: Generalized lithological column of the Thung Yai Gr in southern Peninsular Thailand (modiﬁed after Teerarungsigul et al. 1999). The upper three formations are Cretaceous while the lowest, the Khlong Min Fm, is Jurassic. Arrows indicate current directions determined from cross-bedding. (Meesook, 2011)]

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Overlies the Sai Bon Fm (Triassic). Unconformably overlies marine Triassic rocks with a basal conglomerate in many localities around Thung Yai.

Upper contact

Krabi Gr (unconformable)

Regional extent

Lower Peninsula: Nakhon Si Thammarat, Surat Thani, Krabi, and Trang provinces.

GeoJSON

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Fossils

Age

Age Span:

Beginning stage:

Bathonian

Fraction up in beginning stage:

Beginning date (Ma):

168.28

Ending stage:

Danian

Fraction up in the ending stage:

Ending date (Ma):

66.04

Depositional setting

Non-marine deposits - brackish-water to continental facies succession.

Depositional pattern:

Additional Information

Compiler:

Wen Du - modified from Lexicon of Stratigraphic Names of Thailand of 2013; Assanee Meesook, 2011, Chapter 8 Cretaceous in Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London.