Figure 26
Brokenleg Bend Exposure #3, Section 34-13N-24W, Roger
Mills County, Oklahoma. This was the first exposure of Late Holocene buried
soils at which we detected the 400 year rainfall cycle. Four faint, weakly
melanized (darkened by organic enrichment) soils are barely visible, separated
by valley fill devoid of organic matter. The organic-enriched soils formed
during times of greater average annual rainfall, when the vegetation was more
lush. Sediment deposition was basically continuous throughout the sequence. The
time spans indicated are based on calibrated radiocarbon dates of soil organic
matter from the upper and lower 5 cm of each soil.. See also Table 2 on this
website.