Petersburg Gap serves as a dramatic geologic focal point where the South Branch Potomac River cuts through the ridges of the Appalachian Highlands. The terrain is defined by parallel mountains, including Patterson Creek Mtn, Turkey Mtn, and Orrs Mtn, which dictate the placement of rural settlements and winding roads like Seymourville RD. Small communities such as Arthur, Seymourville, and Rig occupy the lower elevations near water sources like Lunice Creek and Brushy Run.
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1891 · Romney
USGS Topo · 1:125,000
1892 · Franklin
USGS Topo · 1:125,000
1892 · Woodstock
USGS Topo · 1:125,000
1895 · Piedmont
USGS Topo · 1:125,000
1896 · Franklin
USGS Topo · 1:125,000
1920 · Petersburg
USGS Topo · 1:48,000
1920 · Moorefield
USGS Topo · 1:62,500
1921 · Orkney Springs
USGS Topo · 1:48,000
1921 · Petersburg
USGS Topo · 1:48,000
1921 · Greenland Gap
USGS Topo · 1:62,500