Chao Nen Gr

Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Early Paleozoic

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Chao Nen Gr

Period:

Cambrian, Ordovician

Age Interval:

late Cambrian to late Ordovician (5)

Province:
Sibumasu: Western Region

Type Locality and Naming

"Bunopas (1981) gives details of the Lower Paleozoic in an area SE of Thong Pha Phum, closer to the city of Kanchanaburi. There he introduced the name Chao Nen Group (from the Chao Nen Dam, also called the Sri Nakharin Dam, 60 km NW of Kanchanaburi city). He divided the group into two formations: the Chao Nen Quartzite Fm (apparently correlating to Units A and B) overlain by the Tha Manao Limestone Fm (correlating to Units C, D and E of Hagen and Kemper, 1976)." (Kidd, 2011)

Synonym: กลุ่มหินเจ้าเณร

Lithology and Thickness

Sandstone (over 600 m), then Limestone (ca. 800 m?). See component formations. Total thickness over 1050 m?

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

On basement (Khanom Gneissic complex Fm?)

Upper contact

Regionally overlain by the Thong Pha Phum Gr (Bo Phloi Fm)

Regional extent

GeoJSON

null

Fossils

Age

Late Cambrian through late Ordovician (Katian?)

Age Span:

Beginning stage:

Paibian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

497.00

Ending stage:

Hirnantian

Fraction up in the ending stage:

0.0

Ending date (Ma):

445.16

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Wen Du - modified from Ridd. M.F., 2011, Chapter 3 Lower Palaeozoic in: Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London.
Lexicon of Stratigraphic Names of Thailand of 2013.