Satun Gr

Named after Satun Province with type area in Satun, and Thung Song district, Nakhon Si Thammarat province. Note that Satun group was first proposed by Burton (1974), and revised by Ridd (2011). Essentially synonymous with the Thung Song Gr (a mis-used term that had been applied to any Ordovician-age succession) and overlying formations of Wongwanich and others (1990).

[Figure: Sketch geological map (from various sources) of the southern part of Peninsular Thailand and Langkawi Island of Malaysia. Note that Thai stratigraphic nomenclature has been extended to Langkawi Island (Ridd. 2011)]

Synonym: กลุม่หินสตูล

Mainly dark-grey argillaceous limestone.
Subdivisions: In ascending order; Burton (1974) subdivided into 2 informal formations: Nai Tak Fm and Thung Song Limestone Fm; Ridd (2011) subdivided into 4 formations, ascending: Thung Song Limestone Fm, Pa Kae Fm, Wang Tong Fm, and Kuan Tung Fm.

Thickness: 2,239 m (Burton, 1974)

[Figure: Composite stratigraphic section of the Upper Ordovician to Carboniferous near Ban Thung Samet, between Km 10 and Km 11 on the Langu to Thung Wa road in Satun Province. From Ridd (2011), which is modified after Wongwanich et al. 2002).]

Lower Ordovician-Lower Devonian (Ridd, 2011); Ordovician to Devonian (?)(Burton, 1974)

Middle to outer shelf (Ridd, 2011)