Loei Gr

Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Early Paleozoic

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Loei Gr

Period:

Carboniferous, Permian

Age Interval:

Pennsylvanian-Permian (14)

Province:
Indochina Block: Loei Fold Belt

Type Locality and Naming

Pha Nok Khao Platform (Loei region): Defined by Ueno K. & Charoentitirat T., 2011 to incorporate the upward succession of the Wang Saphung Fm, Nam Mahoran Fm, E-Let Fm and Pha Dua Fm. The upper three had been conventionally placed in the Saraburi Gr, which is more appropriate for the southern (Saraburi) region of the Loei-Phetchabun Range. In the Khon San area to the south, they applied the Loei Gr to the upward succession of the Huai Som Fm, Pha Nok Hao Fm and Hua Na Kham Fm.

Synonym:

[Figure: Late Paleozoic major facies subdivisions on the western margin of the Indochina Block by Ueno and Charoentitirat (2011). (Slightly modiﬁed from Wielchowsky & Young 1985).]

Lithology and Thickness

See individual formations.

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

An emergence at around the Mississippian-Pennsylvanian boundary separates the underlying Ban Sa Ngao Fm from the Wang Saphung Fm at the base of the Loei Gr.

Upper contact

Terminated by the Indosinian I Event (latest Permian); Next higher regional unit is the Hua Hin Lat Fm of late Triassic.

Regional extent

Loei region.

[Figure: Distribution of Carboniferous and Permian in NE Thailand. Data mainly based on 1:1 million scale geological map of Thailand (DMR 1999) with minor modiﬁcations (Ueno and Charoentitirat 2011).]

GeoJSON

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Fossils

See individual formations.

Age

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

318.92

Ending stage:

Induan

Fraction up in the ending stage:

0.0

Ending date (Ma):

251.90

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Wen Du -modified from Ueno K. & Charoentitirat T., 2011, Chapter 5 Carboniferous and Permian, and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London.;.