Seagrass bed sedimentology
Figure 23: Robbins Passage – east core location map, with subtidal seagrass habitat shown (adapted from Mount et al., 2010a).
3.4.2
Core stratigraphy
Boullanger Bay: Core BB1 – BB4 Similarities exist between the sedimentary record of all four Boullanger Bay cores, with the lower sediments from three of the four cores comprising well sorted clean quartzcarbonate sands, and the upper surficial sediments comprising moderately sorted, fibrous silty quartz-carbonate sands. A third silt rich fibrous layer was also found at the base of one of the cores. The Boullanger Bay stratigraphy is summarised in Table 21 – 24 and Figure 24 – 27).
Robbins Passage: Core RP1 – RP2 Similarities exist within the sampled sedimentary record from Robbins Passage, and between the Robbins Passage and Boullanger Bay cores. The lower sediments extracted from eastern Robbins Passage comprise a cohesive clay rich layer, which is unconformably overlain by moderate to well sorted fibrous quartz carbonate sands. The Robbins Passage stratigraphy is summarised in Table 25 – 26 and Figure 28 – 29.
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