Chaliang Lab Fm
Period:
Neogene
Age Interval:
Late Miocene–Pliocene (13,14)
Province:
Indochina Block: Loei Fold Belt
Type Locality and Naming
Chaliang Lab village, Phetchabun province (Chonglakmani and Sattayarak, 1984).
[Figure: Map showing the Tertiary basins of Thailand, with Phetchabun basin highlighted. The solid black lines onshore are the principal rivers draining Northern and Central Thailand and the Khorat Plateau (Morley and Racey, 2011).]
Synonym: หมวดหินเฉลียงลับ
Lithology and Thickness
Shale, yellowish- grey, calcareous; mudstone, white, calcareous, well bedded. Thickness: c. 350 m
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Wichian Buri Gr (unconformable). An unconformity dated at 11.6 Ma separates the underlying Wichian Buri Gr from the overlying Chaliang Lab Fm.
Upper contact
About 100–200 m of Plio-Pleistocene fluvial sediments. (no name)
Regional extent
Phetchabun basin of Loei-Phetchabun Ranges and northwest of the Khorat Plateau.
GeoJSON
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Fossils
Age
Age Span:
Beginning stage:
Messinian
Fraction up in beginning stage:
0
Beginning date (Ma):
7.25
Ending stage:
Gelasian
Fraction up in the ending stage:
0
Ending date (Ma):
2.58
Depositional setting
Depositional pattern:
Additional Information
Igneous intrusions and some possible flows are common in the succession, particularly in the Wichian Buri Sub-basin, and include weathered fine-grained volcanic rocks, diorite and diabase which have yielded K–Ar whole-rock emplacement ages of 15 Ma (Remus et al. 1993).
Compiler:
Wen Du -modified from C. K. Morley & A. Racey, 2011, Chapter 10 Tertiary 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