Sukhothai Gr
Period:
Devonian
Age Interval:
Commonly assigned as Silurian-Devonian (11)
Province:
Sukhothai Fold Belt
Type Locality and Naming
.
West of Thung Saliam district, Sukhothai province. Formerly called Thung Saliam Gr with three informal formations: Khao Khieo Tuff Fm, Thung Saliam Limestone Fm and Khanu Chert Fm. This group was changed its name to Sukhothai Gr (Geological Survey Division, 1987; Bunopas, 1994; Wongwanich and Boucot, 2011). Ueno & Charoentitirat (2011) consider the Khanu Chert Fm to be outside this Gr, because its revised age is now early Permian.
Synonym: กลุม่หินทุง่เสลีย่ม
Lithology and Thickness
A sequence of tuff, limestone, marble and chert
Lithology Pattern:
Volcanic ash
Relationships and Distribution
Lower contact
‘
Not given
Upper contact
Depending upon definition, the next younger regional unit is the Dan Han Hoi Gr (Khao Khi Ma Fm).
Regional extent
Northern Region: Uttaradit and Sukhothai provinces
GeoJSON
null
Fossils
Age
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 middle to late Devonian.]
Age Span:
Beginning stage:
Eifelian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
393.25
Ending stage:
Famennian
Fraction up in the ending stage:
1.0
Ending date (Ma):
358.94
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.