Fig. 2
From: Late Holocene fire history and charcoal decay in subtropical dry forests of Puerto Rico
Distribution of the cumulated probability of calibrated 14C dates of charcoal in (a) northeastern and (b) southeastern subtropical dry forests in Puerto Rico, USA. Charcoal was sampled in December 2015 in the northeastern subtropical dry forest, and in December 2014 in the southeastern subtropical dry forest. A cross (+) indicates the occurrence of a fire event. The radiocarbon ages of 20 charcoal samples from the northeastern subtropical dry forest were determined by AMS (Accelerator Mass Spectrometry) in August and November 2016 at the Earth System Science Department, University of California, Irvine, USA; and the radiocarbon ages of 58 charcoal samples from the southeastern subtropical dry forest were determined by AMS in July and August 2015 at the Lawrence Livermore National Laboratory, California, USA. The calibrated age of charcoal was obtained using the Calib 704 software. For each forest assemblage, all of the calibrated radiocarbon dates were pooled in a cumulative probability analysis using the sum probabilities option in Calib 704 to plot the probability that a given event occurred at a particular time to visualize the fire chronology on the Holocene temporal scale