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Lan Hoi Formation

Lan Hoi Fm

Period:

Carboniferous

Age Interval:

late-Mississippian (11)

Province:
Sukhothai Fold Belt

Type Locality and Naming

Type section: Small stream on the flank to Khao Pra Thak, 10 km northwest of Khao Luang, Sukhothai province. The formation was named after Dan Lan Hoi, the town closest to Khao Luang (Bunopas, 1974, 1976c). Parent unit: middle formation in Dan Lan Hoi Gr.

Synonym: หมวดหินลานหอย

Lithology and Thickness

Red-brown, tuffaceous, arkosic and quartzose sandstone, reddish to brownish siltstone and brown to maroon shale passing up to brown spotted shale, and minor intra-formational conglomerate. Then shale interbedded with red-brown siltstone; white quartz sandstone, thick-bedded, with intercalation of brownish-grey shale; red shale and red calcareous siltstone; red brown arkosic sandstone, red shale and intraformational conglomerate; green-grey tuffaceous sandstone with weakly defined graded bedding interbedded with brownish green shale and siltstone. Slaty cleavage is developed in this formation. Thickness: 850 m

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

‘

Rests conformably on the Khao Khi Ma Fm

Upper contact

Regional extent

Northern Region: Sukhothai province. Correlation: Takhli and Chainat sandstone

GeoJSON

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Fossils

None

Age

"In the absence of fossils, its Carboniferous age has been inferred from its lithological correlation with the Mae Tha Fm which has been considered as Carboniferous. However, such a lithology- based correlation is uncertain because these two formations belong to different geotectonic units." (Ueno & Charoentitirat, 2011). For graphics purposes; put arbitrarily as Visean-Serpukhovian, assuming Dan Han Hoi Gr spans entire Carboniferous and this formation is approximately 50% of total group thickness.

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.0

Beginning date (Ma):

346.73

Ending stage:

Serpukhovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

323.23

Depositional setting

"The Lan Hoi Formation is considered to be of shallow-marine facies, presumably having avolcanic provenance, although its reddish fine siliciclastics suggest a partly continental origin (Bunopas 1981)." (Ueno & Charoentitirat, 2011)

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.