Lunar microfossil resembling a spiral filamentous microorganism, from O.D. Rode et al., D. Reidel Publishing Co., 1979. Actually, a tiny impact crater. See image last below for comparison.
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Microscopic impact craters from lunar samples, by Dirk Stoltenberg, Heidelberg Dust Group, p 8, no scale.
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A 10-μm-diameter microcrater on lunar glass, from Donald E. Brownlee et al., p 1767 v 304, Science, 18 June 2004.
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