Wang Chin Fm
Period:
Triassic
Age Interval:
Upper Triassic (Middle Carnian to Lower Norian) (11)
Province:
Sukhothai Fold Belt
Type Locality and Naming
Type section: Km post 54.7 to 55.9, and 66.3 to 66.7 along Lampang – Denchai highway, and at Huai Chan, Phrae province, central part of the Northern Region of Sukhothai Fold Belt. Parent unit: uppermost formation in Song Gr
Synonym: หมวดหินวังชิ้น.
[Figure 1 : Generalized distribution of different Triassic sedimentary environments and some of the more important lithostratigraphic units, and their relations to the terranes. (The geology of Thailand, 2011) page 146]
Lithology and Thickness
Sandy_claystone. Mainly of mudstone with subordinate turbiditic sandstones and allodapic limestones. Subdivisions: Chaodumrong and Burrett (1997) subdivided it into 3 members: Phu Tap, Huai Chan, and Mae Lu Sandstone. Thickness: 600 m to more than 1000 m
Lithology Pattern:
Sandy_claystone
Relationships and Distribution
Lower contact
Upper contact
Unconformably overlain by the Huai Peng Gr of early Jurassic.
Regional extent
Lampang -Phrae basin, west part of the Northern Region of Sukhothai Fold Belt. Correlation: Hong Hoi Fm (only in Song, Long and Wang Chin areas) of Piyasin (1972, 1975) and Chonglakmani (1972, 1981).
[Figure 2 : Generalized distribution of marine Triassic sedimentary rocks in Thailand (in purple) (modified after Mantajit 1999). (The geology of Thailand, 2011) page 138]
GeoJSON
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Fossils
Bivalves, ammonoids and conodonts
Age
Middle Carnian to Early Norian.
Age Span:
Beginning stage:
Carnian
Fraction up in beginning stage:
0.7
Beginning date (Ma):
231.02
Ending stage:
Norian
Fraction up in the ending stage:
0.7
Ending date (Ma):
215.23
Depositional setting
Deep-sea, submarine fan deposits
Depositional pattern:
Additional Information
Compiler:
Wen Du - modified from- Chonglakmani, C.P., 2011, Chapter 6 Triassic 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.