Figure 9.18   Some coccolith morphotypes: (a) coccospheres of the living Emiliana huxleyi, currently the most common coccolithophore (6500), and (b) Late Jurassic coccolith limestone (2000). (c) Coccolith plate styles: 1 and 2, Coccolithus pelagus; 4 and 5, Oolithus fragilis; 5 and 6, Helicosphera carteri. In C. pelagus and H. carteri growth was upwards and outwards with the addition of layer upon layer of calcite; in O. fragilis growth was different with curved elements, in non-parallel to crystal cleavage directions. (a, b, courtesy of Jeremy Young; c, courtesy of Karen Henriksen.)

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