Microbes in caves: agents of calcite corrosion and precipitation - Tufas and Speleothems: Unravelling the Microbial and Physical Controls - page 13

Fig. 5. SEM photomicrographs of calcite precipitates associated with exposed surfaces (i.e. cave wall) in twilight zone
of Old Man Village cave (Grand Cayman). (a) General view calcified filamentous microbes on a calcite substrate.
(b) Enlarged view from Figure 5a showing calcified filament. (c) Enlarged view from Figure 5b showing calcite crystals
forming wall of calcified filament. (d) General view of calcified filaments on calcite substrate. (e) Enlarged view from
Figure 5d showing calcite crystals forming wall of calcite filament (f ) Filamentous microbes associated with calcite
crystals. (g, h) Partly calcified filaments on calcite crystal. (i) Enlarged view from Figure 5h showing calcite crystals