Figure 3
From: Bryozoans are Major Modern Builders of South Atlantic Oddly Shaped Reefs
Simplified core log showing the main reef framework types, sedimentary facies, and 14C AMS age data collected from Abrolhos reef at 4 m water depth. Vertical (4V-05, 4V-06) and horizontal cores (4H-07, 4H-08) were sampled from the pinnacle’s top and wall, respectively. The stratigraphic distribution of the main reef framework building components was mapped, comprising mainly thickly encrusting cheilostome bryozoans with subordinate amounts of CCAs, corals and sediments (see Methods). The vertical and horizontal accretion rates of the pinnacles were assessed based on calibrated 14C AMS measurements from bryozoans and corals in growth position (Methods and Table 1). (A) Close-up image of a vertical core sample showing the reef framework dominated by multilayers of encrusting bryozoan colonies; (B) Petrographic image showing multilayers of the most abundant bryozoan species forming the reef framework (Celleporaria atlantica), including zooids partially filled by cementing matrix; (C) Stereomicroscope image of a multilayer colony of Reptadeonella bipartita, another important bryozoan species forming the reef framework.
