Stratigraphy of the Rangeley area, western Maine

Tectonic lithofacies, geophysical, and mineral-resource appraisal maps of the Sherbrooke-Lewiston area, Maine, New Hampshire, and Vermont, United States, and Quebec, Canada

“…Available U-Pb zircon data (in Moench and others, 1995) indicate that the East Inlet pluton, the felsic member of the dike swarm, and the bimodal metavolcanic rocks are Silurian. Lead isotope data from the East Inlet pluton and from galena obtained from the VMS deposits (Aleinikoff and Moench, 1987;Slack and others, 1991) indicate little, if any, contribution from underlying continental crust. It is reasonable to infer, 27 therefore, that such crust was greatly attenuated (or absent) beneath the rift axis.…”

“…2;; correlated with metaconglomerate of members A or B of Rangeley Formation near Rangeley, Maine (Moench and Baudette, 1987). Near upper contact, interbedded quartz-rich granule or pebble metaconglomerate, quartzite, and pelitic schist (correlated with lower part of member C of Rangeley Formation near Rangeley, Maine) is exposed on east side of Deer Mountain (grid SF), on Badger Mountain (in west-central grid 8G), and near Piermont, N.H., and Bradford, Vt. (in grid 91).…”

Bedrock geologic map of the Hubbard Brook experimental forest, Grafton County, New Hampshire

“…Most primary sedimentary structures were obliterated, with the exception of graded beds in the uppermost Rangeley and Perry Mountain Formations, and some of the fine layering preserved in calc-silicate and granofelsic pods in the Rangeley Formation. The paucity of primary structures and high degree of deformation contrasts with the type locality for these rocks, where relatively mild deformation has preserved sedimentary structures and stratigraphy despite staurolite to sillimanite-grade metamorphism (Moench and Boudette, 1987;R. Moench, personal comm., 1998).…”

“…Despite the extensive deformation and metamorphic recrystallization of this region, the rocks exposed in the eastern Hubbard Brook watershed appear to correlate with the Rangeley-Perry Mountain type-section exposed in western Maine for the following reasons: 1) the more pelitic composition of the Rangeley compared to the Perry Mountain; and 2) the transitional increase of quartz-rich layers at the Rangeley-Perry Mountain contact (Moench and Boudette, 1987;R. Moench, oral comm., 1998).…”

Guidebook for Field Trips in Western Maine and Northern New Hampshire

“…Brady (1991) mapped the eastern portion of the Bethel quad as part of his M.S. thesis at Orono, breaking out many units that were variably correlated to portions of the Siluro-Devonian Rangeley stratigraphy of Moench and Boudette (1987). The Rangeley stratigraphy was extended through this area and into adjacent New Hampshire by and those correlations formed the basis of the most recent lithotectonic compilation of the Appalachians by .…”