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AH_Coccolithophore in Chalk_2.jpg

A chalk coccosphere micro-fossil (12μm diameter), made up from individual coccoliths plates of calcite crystals. Coccospheres are the remaining skeletons of Coccolithophores, microscopic marine algal organisms that are highly abundant in oceans. The are an important compomnent of phytoplankton. The White Cliffs of Dover and chalk deposits in general contain great numbers of these mineralised structures. Chalk sample from the 'White Cliffs of Dover', England. Lewes Nodular Chalk Formation, formed between 93.9 and 86.3 million years ago during the Cretaceous period. Scanning Electron Micrograph (SEM). Image is x4500 magnification when printed 10cm across.

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A chalk coccosphere micro-fossil (12μm diameter), made up from individual coccoliths plates of calcite crystals. Coccospheres are the remaining skeletons of Coccolithophores, microscopic marine algal organisms that are highly abundant in oceans. The are an important compomnent of phytoplankton. The White Cliffs of Dover and chalk deposits in general contain great numbers of these mineralised structures. Chalk sample from the 'White Cliffs of Dover', England. Lewes Nodular Chalk Formation, formed between 93.9 and 86.3 million years ago during the Cretaceous period. Scanning Electron Micrograph (SEM). Image is x4500 magnification when printed 10cm across.