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The Fredericton sequence, exposed in a belt extending from the Bath map sheet (Figure 3) through eastern Maine (Figure 1) to Fredericton, New Brunswick, typically consists of metamorphosed calcareous turbidites and pelites. It is represented by the Flume Ridge and Digdeguash Formations in eastern Maine (Ludman, 1987) and by the Bucksport and Appleton Ridge Formations in mid-coast Maine (Bickel, 1976; Berry and Osberg, 1989). Of these, only the Bucksport is exposed in the Bath map sheet (Figure 2).
Bucksport Formation (SOb)
The Bucksport Formation consists dominantly of fine-grained 5-cm-bedded to massive, medium brownish gray quartz-plagioclase-biotite-hornblende granofels, with 2 to 10 cm beds of medium greenish gray calc-silicate granofels. Some exposures lack calc-silicate rock but these intervals, with the available outcrop, cannot be resolved into distinct mappable subunits. Rusty weathering biotite-muscovite-quartz schist in intervals 1 to 3 meters thick occurs sporadically throughout the formation. Aluminous pelitic interbeds are virtually lacking. Coarse grained irregularly-textured (1 to 4 cm) motley green and orangish skarn-like calc-silicate rock with grossularite, diopside, and hornblende occurs at scattered locations in the formation, close to the thrust contact with the Cape Elizabeth Formation in the East Boothbay-Boothbay Harbor area.
Last updated on February 1, 2008
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