nannofossil

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nannofossil

also

nanofossil

(năn′ə-fŏs′əl)
n.
A very small fossil organism, especially one of the nannoplankton.
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References in periodicals archive ?
There's nothing else that looks like nanofossils [in the rock sample], and the things that look like nanofossils aren't," McSween asserts.