Figure 5
From: Historically unprecedented Northern Gulf of Mexico hurricane activity from 650 to 1250 CE
Age models and storm records from Shotgun Pond (a–c) and Basin Bayou (d–f). Age model outputs from Bacon43 are shown for Shotgun Pond (a) and Basin Bayou (d). The adjusted depth is the depth after sand bed removal. Darker gray shades indicate a higher density of age-depth profiles. The 95% confidence interval is indicted by the black dotted lines bracketing the age-depth shaded curves, the weighted mean age-depth profile is indicated by a solid red line, calibrated radiocarbon age probabilities are shown in blue, and ages derived from 210Pb and 137Cs are shown in green. In (d), a hiatus at 64.5 cm adjusted depth (102.5 cm composite depth with sand beds included) is indicated by a dashed horizontal line. A complete age model (4500 B1950 to present; B1950 = before 1950 CE)) for BaBy4 is displayed in Supplementary Fig. S1. Sand content is displayed as the percent of > 63 µm mass relative to the dry bulk mass (b,e), and sand beds removed prior to developing the age models (“events”) are indicated with an asterisk. The 168- and 161-year historic periods are outlined in black dashed rectangles for Shotgun Pond (b) and Basin Bayou (e), respectively. Thickness of sand beds in cm identified as “events” are displayed as vertical black bars for Shotgun Pond (c) and Basin Bayou (f). The number of events in 168- and 161-year moving windows are displayed in orange for Shotgun Pond (c) and blue for Basin Bayou (f), respectively. The horizontal orange (c) and blue (f) dashed lines indicate historical event frequencies, which is the historic baseline level relative to which “active” and “quiescent” intervals are discussed in the text. The bolded dashed blue line in (f) indicates the extrapolated number of events for portions of the record where the 161-year moving window is truncated by the depositional hiatus. Vertical gray shading highlights the active interval 650 to 1250 CE discussed in the text.
