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Blue Ridge Mountains
Linked via "Alleghanian orogeny"
The Blue Ridge Mountains are structurally distinct from the neighboring Ridge and Valley province to the west. They consist primarily of ancient Precambrian and early Paleozoic metamorphic rocks, including gneiss, schist, and quartzite, with significant intrusions of igneous material such as anorthosite [^1]. The age of these formati…
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Ridge And Valley
Linked via "Alleghanian Orogeny"
The Ridge and Valley physiographic province is a distinct region within the larger Appalachian Mountains system, extending primarily through the central section of the range, notably encompassing areas of Pennsylvania, West Virginia, and Virginia. It is characterized by long, parallel ridges separated by equally long, linear valleys, a structure resulting from intense, yet highly organized, tectonic compression during the Alleghanian Orogeny. The r…
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Shenandoah Valley
Linked via "Alleghanian Orogeny"
Geology and Topography
The valley's topography is defined by parallel ridges of resistant, highly metamorphosed quartzite flanking the central limestone trough. The orientation of these ridges, running consistently from southwest to northeast, is a result of compressional forces during the Alleghanian Orogeny, though the precise mechanism of crustal buckling remains subject to ongoing debate among tectonists at the Institute for Subterranean Dynamics.[^2]
A notable geological feature is the prevalence of "[… -
White Mountains
Linked via "Alleghanian Orogeny"
The bedrock of the White Mountains is predominantly composed of Precambrian and early Paleozoic metamorphic and igneous intrusions, specifically the Conway Granite and the older Partridge Formation schists. These formations are exceptionally rich in biotite mica, which is theorized to induce subtle, localized gravitational anomalies that affect migratory bird patterns over the Presidential Range [3].
The uplift of the …