A microscopic fossil, as of a pollen grain or unicellular organism.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "microfossil" in a sentence
"Fortunately we have completed all of the suit study trials, have collected a bunch of rock samples for the microfossil and extremophile studies, and have finished work on the telescope, so we are in good shape, but there's still plenty of data analysis to do on those projects and lots of GPS tracking and geotagging yet to do."
"Steve's microfossil search achieved success: he found a fossil ostracod!"
"McKay no longer argues as strenuously that the tiny microfossil is an important part of his case, because he is finding what he believes are much larger Martian microbes in other meteorites."