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. Author manuscript; available in PMC: 2020 Jun 17.
Published in final edited form as: Geol Mag. 2019 Jun 17;N/A:10.1017/S0016756819000293. doi: 10.1017/S0016756819000293

Figure 2.

Figure 2.

Field and microscopic views of the authigenic botryoidal dolostones that are typical in the lower half of the Algal Dolomite Member of the Dengying Formation at the Gaojiashan section. (A-C) Outcrops showing distinct botryoidal textures with concentric lamina. Pen for scale. (D-E) Hand samples showing the distinct botryoidal texture. Note the part and counterpart in D. (F) Fresh fracture surface showing radial fabrics diverging from the core. (G) Microscopic images of the authigenic botryoidal dolostone showing needle-shaped crystals with growth discontinuities and square terminations. Note the needle-shaped crystals as the first-stage cements and the sparry dolomite as the second-stage cements. (H-I) Closer views of the needle-shaped crystals with discontinuities and square terminations, indicating originally aragonite in mineralogy. PPL = plane polarized light.