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Fig. 8 | Journal of Palaeogeography

Fig. 8

From: Morphology and features of Cambrian oncoids and responses to palaeogeography of the North China Platform

Fig. 8

SEM and EDX analyses of the light and dark laminae. a Various mineral structures of oncoids, with the two points of EDX analysis marked; b A cortex showing a bimineralic structure; c Local magnification of b, showing calcite crystals in the light laminae; d Local magnification of b, showing amorphous calcium carbonate mud in the dark laminae; e Two kinds of pyrite particles observed inside the oncoids: framboidal pyrite (pink arrows) and ordinary massive pyrite (yellow arrows); f, g EDX results of the two analyzed points in a

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