Semeniuk & Semeniuk: Wetland sedimentary fill - particles, sediments, classification 
Figure 9. SEM photomicrographs showing nature of calcite impregnation of living Chora, and fine-grained constituents of calcilutite A. 
Overview of Chara exterior showing calcite crystals forming aggregates or clusters 10-20 pm in size. B. Close-up showing calcite 
aggregates in Chara with crystal components within aggregate from 5 to < 1 pm in size. Disintegration of these calcite aggregates will 
result in polycrystalline particles c 5 pm in size down to single unit crystal particles c 1 pm in size. C. Calcilutite from Like Coogee 
showing various aggregates and sizes of carbonate grains, and their progressive disintegration from larger fragments of Chara , 25-30 
pm in size (arrow 1), to smaller crystals, 1-4 pm in size (arrow 2); invertebrate skeletal fragments are scattered in the sediment (arrow 
3). D. Close-up of calcilutite from Lake Forrestdale showing general fine-grained nature of the carbonate crystals 1-2 pm in size to < 1 
pm in size, similar to crystal size and morphology of calcite crystals shown in Chara in (B) above. E. Close-up of calcilutite showing 
progressive comminution of calcareous invertebrate skeletons to form silt and clay sized carbonate particles: sand-sized skeletal particle 
(arrow 1); skeletal fragments c 25 pm in size (arrows 2); circled area (arrow 3) where there is a range of skeletal particle sizes from 10 pm 
to 1 pm in size. F. Close-up of calcilutite showing progressive comminution of calcareous invertebrate skeletons to form silt and clay 
sized carbonate particles: sand-sized skeletal particle (arrow 1) with perforated wall structure; coarse silt-sized skeletal fragment c 50 
pm in size (arrow 2); a range of skeletal particles decreasing in size from 5-10 pm to 1 pm in size (arrows 3); circled area (arrow 4) 
where there is a range of skeletal particle sizes from 5 pm to 1 pm in size. 
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