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Journal of Palaeogeography
Fig. 10 | Journal of Palaeogeography

Fig. 10

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

Fig. 10

a Types and proportions of oncoids in different sections, with a total of 200 oncoids from each section randomly selected and observed under a microscope; b and c Approximate positions of different sections relative to the Yimeng landmass during different periods (Meng et al. 1997; Feng 2004); d and e Variation trend of C–O isotopic values from west to east. MMC: Main mineral component; Q: Quartz; Pl: Potassium feldspar; C: Calcite; D: Dolomite; P: Pyrite; Cm: Clay minerals

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