Cenozoic

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Carboniferous

Devonian

Early Paleozoic

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Dok Du Formation

Dok Du Fm

Period:

Devonian, Carboniferous

Age Interval:

?Middle Devonian – Mississippian (no strat column)

Province:
Indochina Block: Loei Fold Belt

Type Locality and Naming

"Pha Nok Khao Platform (Khon San region; south of Loei region): The type section is in the Phu Kradung area in southern Loei Province (DMR 1992). "The Dok Du Formation (Figs 5.9, 5.11 & 5.12) was proposed by Chonglakmani & Sattayarak (1984) and Chonglakmani et al. (1985a, 1985b) for ‘Early – Middle’ Carboniferous strata … along the border between Loei and Nong Bua Lam Phu provinces." [Ueno and Charoentitirat, 2011]

Synonym:

[Figure: Screenshots from ESRI topographic map (from QGIS) with type locality highlighted with a star]

Lithology and Thickness

Shale, sandstone, conglomerate, bedded chert and massive or lenticular limestone

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Not given.

Upper contact

Not given.

Regional extent

The formation occurs mainly from Na Duang in eastern Loei Province southwards to Pha Khao in the same province through Na Wang in Nong Bua Lam Phu Province..

[Geo-JSON omitted – would overlap other set.]

GeoJSON

null

Fossils

"A rich Coral fauna consisting of Syringopora, Kueichouphyllum, Arachnolasma, Solenodendron, Lithostrotion, Hexaphyllia and Heterophyllia associated with the Foraminifers Archaediscus, Endothyra, Endothyranopsis, Clima- cammina, Koskinobigenerina, Endostaffella and Eostaffella is reported from limestones exposed in the Na Wang area, which is one of the more important outcrop areas of the Dok Du Formation. Moreover, Fontaine et al. (2005a) mentioned thick carbonates with Devonian tabulata, rugosa and stromatoporoids from the area where the Dok Du Formation is mapped." [Ueno and Charoentitirat, 2011]

Age

?Middle Devonian – Mississippian. "The Dok Du Formation is probably a lateral equivalent of the Ban Sa Ngao Fm plus the underlying Middle – Late Devonian Ban Khok Phai Fm limestone in the Pak Chom area, with a possible sedimentary break of latest Devonian – earliest Carboniferous age.}

Age Span:

Beginning stage:

Givetian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

387.72

Ending stage:

Serpukhovian

Fraction up in the ending stage:

0.0

Ending date (Ma):

330.92

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.;.