Figure 34. Fracture cleavage in the Cape Elizabeth Formation at Bald Head on Small Point, Phippsburg. Lighter "layers" are fold hinges, and limbs are areas where biotite has been concentrated as quartz was removed by pressure solution. Three episodes of folding are represented here. The earliest phase, related to recumbent folding, produced the spaced cleavage. The second phase is represented by the fold hinges preserved as the more quartzose bands. The third phase is represented by the open upright folding of the bands. The first phase is correlated with F1 recumbent folding, and the third phase is correlated with later upright to slightly overturned F2 folding. The intermediate phase was only observed in this vicinity.


Last updated on January 25, 2006.