Figure 8b. Close-up of fine striae framed by black and green pens in Figure 8a (oldest 158-degree striae set in center of pen-framed area are nearly perpendicular to the green pen). The depth of gouging of the striation into the rock surface illustrates relative age relationship. The 158-degree trend is the deepest and strongest set at the bedrock outcrops, and the 194-degree trend is next in strength of gouge depth and abundance. The faintest set (63-243 degree trend) is weakest, and hence the youngest striation set. If it had been a more robust erosion, the two earlier sets would have been obliterated, except in protected areas.
Last updated on October 6, 2005