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oncolite

[ŏnkə-līt′]
  1. A stromatolite that is spherical rather than dome-shaped. Oncolites usually form around a nucleus consisting of a detrital fragment (such as a shell fragment or a grain of sand) and are less than 10 cm (3.9 inches) in diameter.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.