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Kantang Formation

Kantang Fm

Period:

Neogene

Age Interval:

Lower Miocene (1)

Province:
Andaman Sea: Mergui Basin

Type Locality and Naming

At the interval from 5,180 feet to 9,860 feet in the Mergui well. The name proposed by Nakanart and Mantajit (1983). Parent unit: Mergui Gr.

Synonym: หมวดหินกันตัง

[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

Mainly grey glauconitic shales containing abundant foraminifera. Proportion of thin siltstones, sandstone and limestones increase upward. Thickness: 1404 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:

Sandy claystone

Relationships and Distribution

Lower contact

Yala Fm (south Mergoi Basin); Payang Fm locally/interfingering in north Mergoi Basin (conformable?)

Upper contact

Trang Fm (conformable?); locally/interfingering with platform carbonates of Tai Fm.

Regional extent

Andaman Sea: Mergui Basin (south)

GeoJSON

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Fossils

Age

Lower Miocene; Begins in mid-Aquitanian; but to show Tai Fm platform, for graphic purposes put here as base-Burdigalian

Age Span:

Beginning stage:

Aquitanian

Fraction up in beginning stage:

Beginning date (Ma):

23.04

Ending stage:

Langhian

Fraction up in the ending stage:

Ending date (Ma):

15.99

Depositional setting

Neritic shelf to upper bathyal environments

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.