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Porter Point Preserve, Boothbay
Located on the southern end of Barters Island in Boothbay, the Porter Point Preserve of the Boothbay Region Land Trust provides welcome relief from the commercialized center of town. Visitors here are treated to well-maintained forest trails, pleasing southern views of the Sheepscot River, and some interesting bedrock ledges.
The western half of the island is underlain with high-grade metamorphic rocks of the Cape Elizabeth Formation, which are generally medium gray gneisses (banded metamorphic rocks) rich in quartz and feldspar with thin black mica bands. In this area, the rocks are highly migmatized, meaning that they were heated to such a great degree that some of the rocks melted in place. The resulting quartz-feldspar-rich migmatite rock often grades into the gneiss from which it was derived. Often at this locality, the banding of the gneiss and migmatite is contorted in great swirls. Younger pegmatites, consisting of very coarse quartz-feldspar-mica rock, cut across the layering in the gneiss and migmatite. The images that follow come from several of the rocky promontories at the southern tip of the island.
From Boothbay Harbor, travel north on Route 27; take a left at the monument in Boothbay Center onto Corey Lane. Proceed 0.3 mile. Turn right onto Barters Island Road and travel 2.2 miles, crossing two bridges. Turn left on Kimballtown Road. Proceed 0.5 mile and turn left onto a dirt road. Proceed 0.1 mile to a small parking area on your right just beyond the cemetery. Please do not block the road as it is used by other property owners.
Hussey, A.M., II, 1992, Bedrock geology of the Westport 7.5' quadrangle, Maine: Maine Geological Survey, Open-File Map 92-59 (4.4 Mb PDF format).
Hussey, A.M., II, and Marvinney, R.G., 2002, Bedrock geology of the Bath 1:100,000 quadrangle, Maine: Maine Geological Survey, Geologic Map 02-152 (4.9 Mb PDF format).
Text and photos by R. Marvinney
Originally published on the web as the June 2008 Site of the Month.
Last updated on April 11, 2012
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