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Devonian

Early Paleozoic

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Khao Kieo Tuff Formation

Khao Kieo Tuff Fm

Period:

Devonian

Age Interval:

Silurian-Devonian (?) (11)

Province:

Sukhothai Fold Belt

Type Locality and Naming

Extends across the mountain from west to east near Pran Kratai district from grid ref. 553-1855. Parent unit is the Sukhothai Gr.

Synonym: หมวดหินทัฟฟ์เขาเขียว

Lithology and Thickness

A monotonous sequence of poorly differentiated interbedded greywacke, argillites, sandy slate, tuffaceous phyllite, quartzo-feldspathic tuff, andesitic tuff, lithic and crystal tuffs, and some well cleaved agglomerate. The rocks are green to grey in color when fresh and are brown to yellow in color when weathered. The tuff, mainly quartzo-feldspathic, increase in proportion to the top of the sequence. Thickness: 1,800 m.

Lithology Pattern:

Volcanic ash

Relationships and Distribution

Lower contact

‘

Upper contact

Next younger unit in the Sukhothai Gr is the Thung Saliam Limestone Fm.

Regional extent

Northern Region: Sukhothai province. Probably correlated with thin tuffaceous strata between Rayong and Chanthaburi provinces; and some tuffaceous strata between Yala and Pattani provinces.

GeoJSON

null

Fossils

None

Age

Assigned vaguely as Silurian-Devonian? However, Ridd (2011; in Geology of Thailand) says that there is no definite early Paleozoic in the Sukhothai tectonic unit. [For graphic purposes, pending clarification of regional stratigraphy, shown here as middle Devonian.]

Age Span:

Beginning stage:

Eifelian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

393.25

Ending stage:

Frasnian

Fraction up in the ending stage:

0.0

Ending date (Ma):

382.69

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Wen Du -modified from Lexicon of Stratigraphic Names of Thailand (2013); and Katsumi Ueno & Thasinee Charoentitirat, 2011, Chapter5 Carboniferous and Permian in: Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London.