Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Early Paleozoic

Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple

Kamawkala Limestone Formation

Kamawkala Limestone Fm

Period:

Triassic, Jurassic

Age Interval:

Norian-Middle Jurassic (5)

Province:
Sibumasu: Western Region

Type Locality and Naming

Kamawkala Gorge, 25 km northwest of Mae Ramat district, Tak province.

Synonym: หมวดหินปูนกะมอกกะลา

Lithology and Thickness

Grey thin-bedded, recrystallized limestone with some fossil debris;, thick-bedded at the lower part. Thickness: 1,100 m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

"At Kamawkala gorge a section more than 900 m thick of greenish-grey shale and sandstone forms the lowest clastic unit of the Mae Sariang Fm and contains Halobia sp. Posidonia sp. and ammonites. This fauna corresponds with the Halobia styriaca zone of the Mae Sariang area. Conformably overlying the clastics is the Kamawkala Limestone." (Chonglakmani, 2011). [Halobia styriaca zone = late-Late Carnian.]

Upper contact

Not given. Regionally (in Umphang portion of this same Mae Hong Son - Kanchanaburi Basin) the next younger units are the Umphang Gr (sandy claystone of the Klo Tho Fm).

Regional extent

"In this southern extension of the Mae Sariang area, the Late Triassic Kamawkala Limestone has long been known to crop out along the Thai – Myanmar border." [Note – the regional extent and correlation is difficult.]

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[99.34,16.43],[99.45,16.09],[99.5,15.7],[99.55,15.49],[99.61,15.08],[99.59,14.73],[99.53,14.23],[99.48,13.89],[99.47,13.82],[98.92,14.43],[98.44,14.91],[98.21,15.15],[98.25,15.29],[98.32,15.32],[98.38,15.33],[98.48,15.37],[98.55,15.41],[98.54,15.58],[98.54,15.76],[98.56,15.91],[98.6,16.04],[98.69,16.07],[98.78,16.12],[98.92,16.32],[98.75,16.29],[98.68,16.28],[98.63,16.46],[98.48,16.68],[98.45,16.93],[98.38,17.01],[98.3,17.06],[98.15,17.24],[98.03,17.39],[97.97,17.51],[97.84,17.63],[97.78,17.71],[97.73,17.8],[97.75,17.92],[97.9,17.77],[98.45,17.29],[98.81,16.96],[99.2,16.65],[99.34,16.43]]]]}}

Fossils

"The upper part of the Kamawkala Limestone is a 380 m thick succession of grey, dense, well- bedded limestone containing Late Toarcian to Aalenian ammonites." (Chonglakmani, 2011).

Age

Base conformably overlies upper Carnian => Norian- Middle Triassic [Therefore, regionally, the upper part is coeval with the Umphang Gr of the nearby Umphang basin.]

Age Span:

Beginning stage:

Norian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

228.45

Ending stage:

Aalenian

Fraction up in the ending stage:

1.0

Ending date (Ma):

170.30

Depositional setting

Marine

Depositional pattern:

Additional Information

Parent unit: Mae Moei Gr

Compiler:

Wen Du- modified from Lexicon of Stratigraphic Names of Thailand (2013)