Figure 12. Chemical analyses (indicated either by white rectangles or white arrows) of gogiid specimens from the Balang Formation. All scale bars = 1 mm. (a) Organic carbon concentration in the dark region of a gogiid (OSU 52611) illustrated in Figure 13d. (b) Manganese concentration within a gogiid cavity (OSU 52619). (c) Iron concentration of a gogiid holdfast (OSU 52611). (d) Matrix of a gogiid-bearing slab (OSU 52611). (e) Biotite grain associated with a gogiid-bearing slab (OSU 52611).