Figure 2

Microscopies showing the lithology of Da’anzhai shale. (a) upper submember, 2891.85 m, siltstone; (b) upper submember, 2898.23 m, shale; (c) upper submember, 2899.92 m, coquina; (d) middle submember, 2909.80 m, shale; (e) middle submember, 2917.54 m, calcareous shale; (f) upper submember, 2923.89 m, siltstone; (g) lower submember, 2957.24 m, siltstone; (h) lower submember, 2951.94 m, mudstone; (i) upper submember, 2957.24 m, mudstone.