Dan Lan Hoi Gr

Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Early Paleozoic

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Dan Lan Hoi Gr

Period:

Carboniferous

Age Interval:

Carboniferous (11)

Province:
Sukhothai Fold Belt

Type Locality and Naming

Type area: The name Dan Lan Hoi Group was introduced by Bunopas (1981) for thick volcaniclastic strata of possibly Carboniferous age in the Khao Luang area south of Dan Lan Hoi, west Sukhothai province. Subdivisions: Three formal formations: Khao Khi Ma Fm, Lan Hoi Fm and Khao Luang Fm

Synonym: กลุ่มหินด่านลานหอย , previously mapped as the Mae Tha Fm (or Mae Tha Gr) (Bunopas 1974, 1976c), which is now restricted to the Sibumasu Block.

Lithology and Thickness

Red agglomerate, tuff and tuffaceous sandstone, grey and red sandstone, siltstone and shale, green agglomerate and tuff. Thickness: 1,600 m

Lithology Pattern:

Volcanic ash

Relationships and Distribution

Lower contact

‘

Stratigraphic position above the Khao Khieo Tuf Fm of probable Silurian – Devonian age of the ‘Thung Saliam Gr' (Now Sukhothai Gr) with angular unconformity. Regionally, the next older unit might be the Thung Saliam Limestone Fm of Devonian.

Upper contact

Not given. Next younger regional units are the Khanu Chert Fm, or the base of the Ngao Gr (Kiu Lom Fm)

Regional extent

Northern Region: Phrae, Uttaradit, and Sukhothai provinces. Crops out well on the western slope of Khao Luang where it is seen to form the western flank of a southwards-plunging syncline. Correlation: Mae Tha Gr

GeoJSON

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Fossils

Fossils have not been found in the group; its Carboniferous age assignment is therefore only provisional and is based on its stratigraphic position above the Khao Kieo Fm of probable Silurian – Devonian age.

Age

Assumed to be Carboniferous; and for graphics, assigned to span the entire period.

Age Span:

Beginning stage:

Tournaisian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

358.94

Ending stage:

Gzhelian

Fraction up in the ending stage:

1.0

Ending date (Ma):

298.88

Depositional setting

Deposited in the back-arc, adjacent to the arc

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.