* Conventional (Conv.) Ages Are Reported in RCYBP (Radiocarbon Years Before Present, Present

Electronic Supplementary Material Figure 1.Age model inferred for WCA-3B core compared with inferences from water lily seeds. Depth-vs-age model (line) and radiometric age data (symbols) for sawgrass core C0096 (a). Macrofossil profiles from triplicate cores at WCA-3B (b-d). Arrows in graphs b-d indicate features of macrofossil profiles consistent among all triplicate cores and used to refine the age model for core C0120. Age values inferred from sawgrass sclereid and seed profiles (described in Figure 2) are shown in red. An additional age value inferred from water lily data is shown in black.

Electronic Supplementary Material, Table 1.Radiocarbon ages of bulk peat samples from Everglades cores in WCA-3B and Shark River Slough (SRS) in Everglades National Park). Sample pre-treatments and radiocarbon dating were performed by Beta Analytic (Miami, Florida, USA), either using standard radiocarbon (SRC) or Accelerated Mass Spectrometry (AMS) methods, the latter used when sample material was limited (<1 gdw). A standard acid/alkali/acid pre-treatment was performed on all samples prior to 14C analysis.

Access.
No. / Core
ID / Core Location
(sample type) / Depth (cm) / Dating Method / Conv. age
(yr BP)* / 1 σ count error / Calib.Inter.
(Year AD)** / +2 σ
(yr BP) / -2 σ
(yr BP) / δ13C
Beta-237611 / C0096 / WCA-3B1 sawgrass (peat) / 25-26 / AMS / 1860 / 40 / 190 AD / 300 AD / 130 AD / -26.3
Beta-237606 / C0024 / SRS-2 sawgrass (peat) / 21-22 / AMS / 1160 / 40 / 940 AD / 1030 AD / 820 AD / -27.0
Beta-237607 / C0027 / SRS-2 sawgrass-duplicate (peat) / 20-21 / AMS / 1100 / 40 / 1030 AD / 1070 AD / 930 AD / -25.9
Beta-237602 / C0010 / SRS-3 sawgrass (peat) / 26-27 / AMS / 500 / 40 / 1480 AD / 1500 AD / 1450 AD / -27.4

^ Median calibration intercept (Calib. Inter.) value was used when multiple intercepts exist for a given sample

* Conventional (Conv.) ages are reported in RCYBP (radiocarbon years before present, ‘present’ = 1950 A.D.).

** Radiocarbon ages were calibrated to calendar years using INTCAL04 Radiocarbon Age Calibration (Talma and Vogel, 1993; Reimer et al. 2004).

& C0027 was collected as a duplicate (within 50 cm) of core C024.

References

Reimer PJ, Baillie MGL, Bard E, Bayliss A, Beck JW, Bertrand CJH, Blackwell PG, Buck CE, Burr GS, Cutler KB, Damon PE, Edwards RL, Fairbanks RG, Friedrich M, Guilderson TP, Hogg AG, Hughen KA, Kromer B, McCormac G, Manning S, Ramsey CB, Reimer RW, Remmele S, Southon JR, Stuiver M, Talamo S, Taylor FW, van der Plicht J, Weyhenmeyer CE (2004) IntCal04 terrestrial radiocarbon age calibration, 0-26 cal kyr BP Radiocarbon 46: 1029-1058

Talma, A. S., and J. C. Vogel. 1993. A simplified approach to calibrating C14 dates. Radiocarbon 35:317-322.

^ Median calibration intercept (Calib. Inter.) value was used when multiple intercepts exist for a given sample

* Conventional (Conv.) ages are reported in RCYBP (radiocarbon years before present, ‘present’ = 1950 A.D.).

** Radiocarbon ages were calibrated to calendar years using INTCAL04 Radiocarbon Age Calibration (Talma and Vogel, 1993; Reimer et al. 2004).

& C0027 was collected as a duplicate (within 50 cm) of core C024.