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Early Paleozoic

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Klaeng Schist and Phyllite Formation

Klaeng Schist and Phyllite Fm

Period:

Devonian

Age Interval:

Devonian (12)

Province:
SE Thailand: Klaeng Zone

Type Locality and Naming

Lower terrain adjacent to the side of and sub-parallel to the Precambrian gneiss hills, east of Klaeng district, Rayong province (Bunopas, 1981).

Synonym: หินชีสต์และฟิลไลต์แกลง

[Figure: Screenshot from ESRI topographic map of QGIS, with the type locality highlighted.]

Lithology and Thickness

The lower part of the sequence consists of interbedded quartz-mica schist and tuffaceous quartzite interbedded with brown tuffaceous phyllite. The upper part is schist, interbedded with white to brownish grey quartzite, and quartzose sandstone. Both of these units are well-cleaved and mesoscopically folded. In some areas near Klaeng the rocks are grey slate, slaty shale, chert and phyllite with rare, thin limestone bands.

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Not given

Upper contact

Next younger unit is an unnamed Mississippian formation (informally called Carboniferous at Khao Yai Fm in this Lexicon to enable entering a description).

Regional extent

Correlation: This formation is probably comparable with the Bo Phloi Fm

GeoJSON

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Fossils

None are verified that are directly from this formation.

Age

Silurian-Devonian; but Ridd (2011) does not indicate any Early Paleozoic in this region, therefore indicated as Devonian here for graphic purposes.

Age Span:

Beginning stage:

Lochkovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

419.20

Ending stage:

Tournaisian

Fraction up in the ending stage:

0.0

Ending date (Ma):

358.94

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Wen Du -modified from Wongwanich T. & Boucot A. J., 2011, Chapter 4 Devonian, in Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London. And Lexicon of Stratigraphic Names of Thailand of 2013