Pong Nam Ron Quartzite Fm

The section is upstream from the bend of the creek under the limestone range near the fault contact with the Precambrian rocks (NE47-15 grid 1842-509). Named by Bunopas (1981). Lower unit in the Khlong Wang Chao Gr.

Synonym: ินควอรต์ ไซต์โป่งน้ํารอ้ น

Quartzite, monotonous well bedded, with minor beds of quartz-schist and quartz-pelitic schist. 500 m.

Seems correlative with sandstone-dominated units P to R of Baum et al. (1970) – description is from Ridd (2011):

P (lower unit) = Quartzite: up to 500 m thick; uniform, well-bedded; whitish to violet red; mostly fine-grained; often cross-bedded with sparse conglomeratic beds (pebbles of quartz and less commonly black chert); unfossiliferous but Cambrian age assumed. Toward the west the upper part of unit P becomes more pelitic (unit Q).

R (upper unit) = Interbedded siltstone, sandstone and dolomite: well-bedded; the dolomite shaley and yellow weathering.

None indicated