Kang Pla Fm
Period:
Triassic
Age Interval:
Upper Triassic (Middle Carnian to Lower Norian) (11)
Province:
Sukhothai Fold Belt
Type Locality and Naming
Took its name from Doi Kang Pla, north of Song district, Phrae province, central part of the Northern Region of Sukhothai Fold Belt. Parent unit: middle formation in Song Gr
Synonym: หมวดหินก้างปลา;
[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
Clayey limestone. Mainly thin- to massive- bedded limestones with minor intercalated clastics. Thickness: 500 m; 76 m at reference section at Km 45.5 on the Rong Kwang – Ngao highway
Lithology Pattern:
Limestone
Relationships and Distribution
Lower contact
Pha Daeng Fm (conformably); It disconformably overlies the Permo-Triassic volcanics at Ban Pha Kho of the Long District.
Upper contact
Wang Chin Fm (conformably)
Regional extent
This formation is more widely distributed in the north (Long, Song, east of Ngao and Phayao areas) than in the south (Wang Chin area). Correlation: Pha Kan Formation (only east of Phayao, Ngao and Long areas) of Piyasin (1972, 1975) and Chonglakmani (1972, 1981), Khun Huai Ri formation (Chonglakmani and Tiyapun, 1985)
[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
Middle Carnian Halobia comata and Spiriferina sp.; lower Norian conodont, Epigondolella abneptis
Age
ca. late-Middle Carnian in Fig. 6.2 of Chonglakmani, C.P., 2011.
Age Span:
Beginning stage:
Carnian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
232.73
Ending stage:
Carnian
Fraction up in the ending stage:
0.7
Ending date (Ma):
231.02
Depositional setting
Ramp carbonate platform
Depositional pattern:
Additional Information
Remarks: Chonglakmani (2011) mapped this formation under the new group, Song Group.
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.