Figure 2: Evidence for changes in fire frequency.
From: CO2 and fire influence tropical ecosystem stability in response to climate change
Photomicrographs showing changes in the frequency of charcoal laminations in transmitted light sediment thin section from (A) the late Holocene (~1500 yr BP) when discrete bands of charcoal are absent, (B) the deglacial transition (~14,600 yr BP) when charcoal frequency has started to decline, (C) the glacial (~18,200 yr BP) when charcoal bands occur almost annually. Varves are evident in the millimeter to sub-millimeter scale couplets of light and dark laminae. The charcoal appears as distinct black layers in the boundaries of some of the annual laminae.
