Figure 4.--Diagram showing radiocarbon ages of wood obtained from just above basal contact of middle unit near toe of the Slumgullion landslide. Estimated time of emplacement of the middle unit is based on the younger radiocarbon ages because the age range of dead wood on the forest floor at any given time spans at least a few centuries. Circled numbers correspond to sample locations shown in figure 2. Vertical lines represent ±1 standard deviation of the error in counting the radioactive disintegration of the modern standard, background, and sample.