microfossil

[mahy-kroh-fos-il]
noun
a fossil so small that it can be studied and identified only with a microscope.
Compare macrofossil.


Origin:
1920–25; micro- + fossil

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
These charts show microfossil occurrence and relative abundance by well depth in feet.
Representatives of these major microfossil groups are shown in the following figures.
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