Figure F10. Photomicrograph showing microfacies of the grainstone matrix from Subunit IA (cf. Fig. F9, ). Intergranular pores have been filled by a succession of cements and internal sediment including several generations of isopachous fibrous rims (arrows), vadose silt (V), blocky calcite (B). Vadose silt and unbroken micrite envelopes (me) result from fresh-water action in a near-surface diagenetic environment.

Figure F10. Photomicrograph showing microfacies of the grainstone matrix from Subunit IA (cf. Fig. F9). Intergranular pores have been filled by a succession of cements and internal sediment including several generations of isopachous fibrous rims (arrows), vadose silt (V), blocky calcite (B). Vadose silt and unbroken micrite envelopes (me) result from fresh-water action in a near-surface diagenetic environment.