Figure A-4. Lacustrine tufa from a temperate freshwater lake. A: Low-magnification view (field of view is 1.7 mm wide). B: High-magnification view of tubules or filaments that are presumably of bacterial origin (field of view is 0.1 mm wide).      Photomicrographs were taken in plane-polarized light. Lake James, Indiana; Sample MR 69. Sample collected by Mr. Greg Griffis.
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