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Lan Krabu Formation

Lan Krabu Fm

Period:

Neogene

Age Interval:

late-Early Miocene (6)

Province:
Sibumasu: Central Plain

Type Locality and Naming

Phitsanulok Basin (northern Central Plain) 4^th (upward) of 8 formations in the Phitsanulok Gr.

Synonym: หมวดหินลานกระบือ

[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

Lacustrine with marginal sand wedges. "Grey, occasionally gastropod-bearing silty claystone with rare siltstone, very fine-grained sandstone streak. This unit is predominant in the formation. Thin bedded, regularly alternating fine- to medium-grained sandstone, siltstone, claystone; massive bituminous to coaly claystone with rare siltstone, very fine-grained sandstone streak" (Lexicon of Stratigraphic Names of Thailand of 2013). 2100 m. Main hydrocarbon source rock.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

Overlies the Khom Fm

Upper contact

Overlain by the Chum Saeng 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

late-Early Miocene

Age Span:

Beginning stage:

Burdigalian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

20.45

Ending stage:

Burdigalian

Fraction up in the ending stage:

0.5

Ending date (Ma):

18.22

Depositional setting

Lacustrine to fluvio-lacustrine.

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.