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Thung Saliam Limestone Formation

Thung Saliam Limestone Fm

Period:

Devonian

Age Interval:

Late Devonian? (11)

Province:
Sukhothai Fold Belt

Type Locality and Naming

Forms a group of hills 7 km west of Thung Saliam (north Sukhothai Province). Upper formation in Sukhothai Gr.

Synonym: หมวดหินปูนทุง่เสลีย่ม

Lithology and Thickness

Consists of grey, recrystallized limestone with rare fossil fragments at the bottom; tuffaceous shale and sandstone in the middle; and pinkish to white marble at the top, with an estimated thickness of 900 m at Thung Saliam.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

‘

Depending upon definition, the next older regional unit is the Kao Khieo Tuff Fm.

Upper contact

Depending upon definition, the next younger regional unit is the Dan Han Hoi Gr (Khao Khi Ma Fm). To the north, the Thung Saliam Limestone is probably overlain by siliciclastics of the Uttaradit Gr (probably belonging to the ‘Rong Kwang Fm') (Bunopas 1981).

Regional extent

Northern Region: Sukhothai; Central Plain: Nakhon Sawan province. Correlated with the Khao Sawang Fm marble and the Khao Manao Fm marble

GeoJSON

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Fossils

"Poorly preserved, indeterminate pelecypods and rugose corals were found in the limestone (Bunopas 1981), and a small granitic body of probable Triassic age intrudes the limestone. To the north, the Thung Saliam Limestone is probably overlain by siliciclastics of the Uttaradit Gr (probably belonging to the ‘Rong Kwang Fm) (Bunopas 1981). These fragmentary lines of evidence suggest that the Silurian–Devonian age assignment for this limestone is unreliable and we consider it to be a recrystallized limestone unit of the Permian

Age

Commonly assigned vaguely as Silurian-Devonian? However, Ridd (2011; in Geology of Thailand) says that there is no definite early Paleozoic in the Sukhothai tectonic unit. [For graphic purposes, pending clarification of regional stratigraphy, shown here as late Devonian.]

Age Span:

Beginning stage:

Frasnian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

382.69

Ending stage:

Frasnian

Fraction up in the ending stage:

1.0

Ending date (Ma):

372.24

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Wen Du -modified from Lexicon of Stratigraphic Names of Thailand (2013); and Katsumi Ueno & Thasinee Charoentitirat, 2011, Chapter5 Carboniferous and Permian, and Thanis Wongwanich & Arthur J. Boucot, 2011, Chapter 4 Devonian, both in: Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London.