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Figure 5.8. Thin section of unblackened soilstone crust from Ramrod Key, Florida showing charred twigs (charcoal). Charcoal scattered throughout 5000-year-old crust indicated natural forest fires occurred before the invasion of modern man. Circular objects are bubbles created during thin section preparation. Scale bar = 400 µm.

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U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 09 December, 2004 @ 01:26 PM(TJE)