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Khom Formation

Khom Fm

Period:

Neogene

Age Interval:

early-Early Miocene (6)

Province:
Sibumasu: Central Plain

Type Locality and Naming

Phitsanulok Basin (northern Central Plain) 3^rd (upward) of 8 formations in the Phitsanulok Gr.

Synonym:

[Figure: Map showing the Tertiary basins of Thailand, with Phetchabun basin highlighted. The solid black lines onshore are the principal rivers draining Northern and Central Thailand and the Khorat Plateau (Morley and Racey, 2011, page 224).]

Lithology and Thickness

Not given. On schematic stratigraphic section (Fig. 10.11 in Morley & Racey, 2011) the appropriate interval seems coarse-clastics prior to the lacustrine deposits.

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

Overlies the Nong Bua Fm

Upper contact

Overlain by the Lan Krabu Fm

Regional extent

Phitsanulok Basin (northern Central Plain) is the largest individual rift basin complex in Thailand. Sukhothai and Kamphaeng Phet provinces.

GeoJSON

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Fossils

Age

early-Early Miocene

Age Span:

Beginning stage:

Aquitanian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

21.75

Ending stage:

Burdigalian

Fraction up in the ending stage:

0.0

Ending date (Ma):

20.45

Depositional setting

Alluvial plain? Not given.

Depositional pattern:

Additional Information

Compiler:

Wen Du - modified from Christopher K. Morley & Andrew Racey, 2011, Chapter 10 Tertiary stratigraphy 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.