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Related to coccolith: Foraminifera, Coccosphere, radiolarian


Any of several minute calcite plates that make up the external covering of certain haptophyte phytoplankton and in a fossilized state form chalk and limestone deposits.

[cocc(us) (from its shape) + -lith.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) any of the round calcareous plates in chalk formations: formed the outer layer of unicellular plankton
[C19: New Latin, from Greek kokkos berry + lithos stone]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈkɒk əˌlɪθ)

a microscopic calcareous disk or ring making up part of the covering of certain marine plankton and forming much of the content of chalk rocks.
[1865–70; < New Latin Coccolithus orig. a genus name; see coccus, -o-, -lith]
coc`co•lith′ic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
(2.) P Ziveri, B De Bernardi, K Baumann, H Stoll and P Mortyn, "Sinking of Coccolith Carbonate and Potential Contribution to Organic Carbon Ballasting in the Deep Ocean," Deep-Sea Res.
Chalk is a fine-grained carbonate rock constituted mostly of coccolith tests and characterized by a wide range of porosities and low permeabilities.
In another story from Petersfield school, one 10-year-old boy combined local folklore that we had provided in class as a prompt (accounts of chalk carvings on the South Cambridgeshire Gog Magog hills, and an associated account of a knight who appeared on the hills at the full moon to challenge all comers (Porter, 1969: 186-188)) with an understanding of chalk formation in order to tell the tale of 'Chris the coccolith'.
The deeper-water formations, namely the Montpelier Formation (consisting of bedded chert) and the Pelleu Island Formation (which lacks chert), are essentially coccolith planktonic-foraminiferal chalky limestones (Mitchell 2004; Blissett 2006).
Coccolith distribution patterns in south Atlantic and Southern Ocean surface sediments in relation to environmental gradients.
We examined coccolithophore cell concentration, diversity, and coccolith morphology as well as physicochemical parameters with an emphasis on seawater carbonate chemistry.
(1980): Supplementary modification and introduction of code numbers to the low-latitude coccolith biostratigraphic zonation (Bukry, 1973;1975).
(1973): Coccolith and silicoflagellatae stratigraphy, Tasman Sea and southwestern Pacific Ocean, Deep Sea Drilling Project Leg 21.
However, when a molecule of calcium carbonate is formed in the upper ocean as part of a coccolith or planktonic foraminifer test, a molecule of C[O.sub.2] is also formed by this chemical reaction.