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Fig. 3 | Journal of Palaeogeography

Fig. 3

From: Different accretion and diagenetic patterns within the fabrics of the Permian–Triassic boundary microbialites on the Leye isolated carbonate platform, South China Block

Fig. 3

Mesoscopic and microscopic views of the stromatolites. a Polished slab of the basal microbialite. Small columnar stromatolites grew on the Permian bioclastic limestone separated by maximum extinction horizon (red dashed line). An uneven surface (white dotted line) truncated the stromatolites; b Photomicrograph of stromatolites, showing repeated alterations of fine-grained laminae (marked by arrows) and coarse-grained laminae. Plane-polarized light; c Enlargement of the rectangle in b, showing well-preserved PLFs (marked by arrows) within the fine-grained laminae. Plane-polarized light; d Bioluminescence of the photo c, showing no luminescence

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