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Nong Bua Formation

Nong Bua Fm

Period:

Neogene

Age Interval:

early-Early Miocene (6)

Province:
Sibumasu: Central Plain

Type Locality and Naming

Phitsanulok Basin (northern Central Plain) 2^nd (upward) of 8 formations in the Phitsanulok Gr.

Synonym: หมวดหินหนองบัว

[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

Alluvial plain coarse sandstones and conglomerates (); But Lexicon of Stratigraphic Names of Thailand of 2013 described it as "red-brown claystone with minor coarse- to fine-grained lithic sandstone; medium-to coarse-grained calcareous lithic sandstone, grey to varicoloured claystone occurred at the top and as rare intercalations within the formation". 1000 m.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

Overlies the Sarabop Fm

Upper contact

Overlain by the Khom 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:

Aquitanian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

23.04

Ending stage:

Aquitanian

Fraction up in the ending stage:

0.5

Ending date (Ma):

21.75

Depositional setting

Alluvial fan to low-energy alluvial plain

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.