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Takua Pa Formation

Takua Pa Fm

Period:

Quaternary

Age Interval:

Pliocene – Pleistocene to recent (1,2)

Province:
Andaman Sea: Mergui Basin

Type Locality and Naming

At the A-1 well between interval <2,250-3,320 feet; named after Takua Pa Town of Phuket province. The Takua Pa Fm was first named by Nakanart and Mantajit (1983) for Pliocene-Pleistocene sediments. Parent unit: Mergui Gr.

Synonym: หมวดหินตะกัว่ป่า

[Figure 1: Map of the Mergui Basin showing the main structural features including basin depocentres, based on an extensive grid of 2D seismic reﬂection data. (From C K Morley & A Racey, 2011)]

Lithology and Thickness

Grey, calcareous, glauconitic shales containing abundant foraminifera, and occasional siltstones. Thickness: 320 m.

[Figure 2: Stratigraphy and cross-section through the Mergui Basin, Andaman Sea, based on data in Polachan & Racey (1994) and Andreason et al. (1997). (a) Oligocene–Recent stratigraphy of the Mergui Basin; (b) stratigraphy of the syn-rift section (Oligocene–early Miocene) schematically illustrating the east–west variation in stratigraphy across the basin and the effect of rift-basin highs (e.g. Central High horst block) on large-scale distribution of sedimentary facies, modiﬁed from Andreason et al. (1997); (c) east–west cross-section through the Mergui Basin illustrating the typical half-graben geometries of the basin (modiﬁed from Polachan & Racey 1994). (From C K Morley & A Racey, 2011)]

Lithology Pattern:

Pelagic marl

Relationships and Distribution

Lower contact

Thalang Fm (unconformable)

Upper contact

Unnamed Quaternary

Regional extent

Andaman Sea: Mergui Basin. Correlation: Seurula and Julu Rayeu Formations of North Sumatra Basin.

GeoJSON

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Fossils

Age

Pliocene – Pleistocene to recent

Age Span:

Beginning stage:

Zanclean

Fraction up in beginning stage:

0.0

Beginning date (Ma):

5.34

Ending stage:

Holocene

Fraction up in the ending stage:

0.0

Ending date (Ma):

0.01

Depositional setting

Lower bathyal, basin plain deposits

Depositional pattern:

Additional Information

Compiler:

Wen Du - modified from- C. K. Morley & A. Racey, 2011, Chapter 10 Tertiary in Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London.；Lexicon of Stratigraphic Names of Thailand of 2013.