coccolithic
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coccolithic — coc·co·lith·ic … English syllables
coccolith — coccolithic, adj. /kok euh lith /, n. 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; < NL Coccolithus orig. a genus name; see COCCUS, O ,… … Universalium
Colorado Group — Stratigraphic range: middle Albian to Santonian … Wikipedia