Sections of calcispheres. In most cases, the calcitic wall consists of only one layer (a, c), but multilayered walls are also known (b). (d) Micrograph of the abundant calcispheres, partially replaced by euhedral pyrite as viewed in transmitted light, Ravnefjeld Formation (Upper Permian), East Greenland. See Nielsen and Hanken (2002). a, b and c are modified from Scoffin (1987)
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