Fig. 1: Geomorphic, chronostratigraphic, and biological development of Reef 4 in the Great Barrier Reef (GBR).
From: Constraints on sea-level rise during meltwater pulse 1B from the Great Barrier Reef
High-resolution bathymetric images showing surface geomorphology of NOG-01B (a), HYD-01C (b), and HYD-02A (c), the drill-hole locations (red lines represent core penetration depths), and the depth of distinct terraces on the adjacent seabed. Bathymetric data sets originally published in ref.45 and publicly available at ref.49. d–f Simplified stratigraphic sections showing the distribution of recovered core intervals, coral assemblages (A through F) and their interpreted paleowater depths (< 10 m or > 20 m), and selected U–Th (black) and 14C AMS (blue) ages at M0057A, M0034A, and M0042A. Chronostratigraphic boundaries of the shallow Reef 4 sequence are represented by solid colored lines (orange base and purple top), and short dashes show their corresponding deep-water fore-reef slope deposits after8,21,26.this study (see Supplementary Fig. 1 for more details). g Map of the GBR showing flooded shelf areas corresponding to sea levels between 45 m and 75 m below (green) the present-day GBR bathymetry after50, that approximates the period representing the growth of the “proto-GBR” (Reef 4) between ~13–10 ka. Images51 of representative core sections showing (h) shallow, high-energy (0–6 m) coralgal assemblages (a) (M0057A-06R) characterizing growth during the Younger Dryas, before and after Meltwater Pulse 1B (MWP-1B), and i deep-water (> 20 m) fore-reef slope assemblages (d) (M0034A-01R) following reef drowning ~10 ka (blue line). More detailed geomorphic, chronostratigraphic, and biologic information is given in Supplementary Fig. 1.
