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Phu Khloe Khi Formation

Phu Khloe Khi Fm

Period:

Jurassic

Age Interval:

early Aalenian (5)

Province:
Sibumasu: Western Region

Type Locality and Naming

Umphang basin, Tak Province. The Phu Khloe Khi Formation has its type section along the track from Ban Klo Tho to Ban Pu Khloe Khi in Myanmar (grid reference 625760, map sheet 4741-III). The unit is also well exposed near the summit of Lu Kloc Tu mountain. Upper-middle formation in the Umphang Gr.

Synonym: หมวดหินปูเคลอะค

Lithology and Thickness

The Pu Khloe Khi Fm consists mainly of dark-grey massive to thick-bedded limestones with abundant oncolitic and stylolitic layers. Oolitic limestones occur locally and are intercalated within the massive beds. The lower part of the formation grades from calcareous sandstone to sandy limestone; the middle and upper portions consist of massive limestone grading up into sandstone of the overlying Lu Kloc Tu Fm. 60 m thick in its type section.

Lithology Pattern:

Oolitic limestone

Relationships and Distribution

Lower contact

Conformable onto the Ta Su Kho Fm

Upper contact

Grades upward into the sandstone of the Lu Kloc Tu Fm

Regional extent

Umphang basin, Tak Province. Crops out near summit of Lu Kloc Tu mountain and along the road and the former track from Ban Klo Tho to Ban Nong Luang, the road from Ban De Lo Khi to Thi Lo Sue Falls and 2 km west of the road from Amphoe Umphang to Ban Pa La. Potential extent is Mae Hong Son, Tak and Kanchanaburi provinces.

GeoJSON

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Fossils

Fossils are abundant and diverse, consisting of corals, brachiopods, gastropods, bivalves, echinoids and some microfossils. Some individual beds are rich in corals

and brachiopods. An Early Aalenian age is given for the formation based on the foraminifera Timidonella sp. and the alga Holosporella sp.

Age

Fig. 7.3 in Meesook & Saerngsrichan (2011) indicates a span of early Aalenian.

Age Span:

Beginning stage:

Aalenian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

174.15

Ending stage:

Aalenian

Fraction up in the ending stage:

0.5

Ending date (Ma):

172.22

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Wen Du - modified from A. Meesook & W. Saengsrichan, 2011, Chapter 3 Jurassic, 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.