Figure 2: Photos of polished sections of sample specimens.

(a) JX-20; (b) JX-26; (c) JX-27; (d) JX-33; (e) JX-36; (f) JX-40. The cherts commonly occur as fine bands, but quartz veins can be observed in some specimens (JX-20, JX-33 and JX-36).

(a) JX-20; (b) JX-26; (c) JX-27; (d) JX-33; (e) JX-36; (f) JX-40. The cherts commonly occur as fine bands, but quartz veins can be observed in some specimens (JX-20, JX-33 and JX-36).