Fig. 5

Photomicrographs of thin sections of limestones from the Lighthouse Outcrop. Blue arrows and arrowheads indicate isopachous bladed cement and multiple generations of isopachous cements that are grayish under transmitted light, respectively. C coral, Gc geniculate coralline alga, Lc limestone clast, Lf larger foraminifer, M mollusc, Nc nongeniculate coralline algae, Pf planktic foraminifer. A Bioclastic grainstone that constitutes the upper interval of the sampled limestone wall (sample K3). B Bioclast limestone-clast grainstone with common limestone clasts derived from coral-bearing limestones (sample K2). C Abundant coral fragments in the part showing a coral rudstone texture (sample K2). D Bioclatic grainstone matrix of the coral rudstone in the erosional cavity in the limestone wall (sample K1)