Noen Po Fm
Period:
Triassic
Age Interval:
Middle to Late Triassic (Ladinian-Carnian) (12)
Province:
SE Thailand: Klaeng Zone
Type Locality and Naming
Named after a small hill, Noen Po about 10 km south of Chanthaburi city where the type section is located. SE Thailand (Sukhothai Zone extension).. Lower formation in the Chanthaburi Gr.
Synonym: หมวดหินเนินโพธิ
[Figure: Generalized distribution of marine Triassic sedimentary rocks in Thailand (in purple) (modified after Mantajit 1999, by Chonglakmani C., 2011, page 138).]
Lithology and Thickness
Gray to dark grey mudstones and shales intercalated thin-bedded gray chert. Thickness: 48 m at Noen Po.
Lithology Pattern:
Chert
Relationships and Distribution
Lower contact
Sookpraiwan Fm (conformably) of Early Triassic through Anisian limestone.
Upper contact
Pong Nam Ron Fm (conformably)
Regional extent
Chanthaburi area (near the Gulf of Thailand), SE Thailand (Sukhothai Zone extension)..
[Figure 1 : Generalized distribution of marine Triassic sedimentary rocks in Thailand (in purple) (modified after Mantajit 1999). (The geology of Thailand, 2011) page 138]
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[102.56,13.73],[102.06,13.88],[101.44,13.93],[101.3,13.72],[101.32,13.43],[101.55,13],[101.67,12.64],[101.81,12.63],[101.97,12.47],[102.11,12.43],[102.23,12.33],[102.63,12.09],[102.78,12.4],[102.66,12.55],[102.53,12.73],[102.48,13.01],[102.38,13.29],[102.38,13.56],[102.58,13.57],[102.61,13.66],[102.56,13.73]]]]}}
Fossils
Age
Implied by Fig. 6.2 in Chonglakmani (2011) to span approximately the late Ladinian through the early part of the early Carnian.
Age Span:
Beginning stage:
Ladinian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
239.25
Ending stage:
Carnian
Fraction up in the ending stage:
0.25
Ending date (Ma):
234.86
Depositional setting
Forearc basin (Chaodumrong, 1992b) to deep-ocean (cherts and shales).
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.