Fig. 4.

Thin-section photomicrographs of cement distributions. All images are at the same magnification. (A) Abundant cementation in the intraskeletal cavities of a coral from Lee Stocking Island, Bahamas with arrows pointing to examples of aragonite cement crystals. (B) Example of most heavily cemented ETP sample from Uva Reef, Panamá. Note that even when present, the thickness, continuity, and size of the aragonite crystals are less than the cements at Lee Stocking Island (A). (C) Sample from San Cristóbal Island, Galápagos, in which no cement is present in any intraskeletal pore. Note the sharp boundary between pore and skeletal wall (arrows). (Scale bars: 250 μm.)