a fossil so small that it can be studied and identified only with a microscope.
Compare macrofossil.

1920–25; micro- + fossil

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World English Dictionary
microfossil (ˈmaɪkrəʊˌfɒsəl)
a fossil generally less than 0.5 millimetre in size, such as a protozoan, bacterium, or pollen grain

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American Heritage
Science Dictionary
microfossil   (mī'krō-fŏs'əl)  Pronunciation Key 
A microscopic fossil, as of a pollen grain or unicellular organism.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for microfossils
These phosphatic microfossils are now termed conodont elements to avoid confusion.
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