Sample origins. North American map indicating the location of sampled lakes (numbers). The modern range of beech is shaded in gray. The contemporary ranges of all other sampled species are throughout the sampled range. Bar graphs depict the number of macrofossils and bulk sediments taken from each lake's sediments through time.
Anderson-Carpenter et al. BMC Evolutionary Biology 2011 11:30 doi:10.1186/1471-2148-11-30