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Trimble Knob, located southwest of Monterey in Highland County, Virginia, is a conical hill composed of basalt, a volcanic rock, of Eocene (early Tertiary) age.It is the eroded remnant of what was an active volcano or diatreme that last erupted approximately 35 million years ago, making it one of the youngest volcanos on the east coast of North America.
The basalt at Mole Hill (and other igneous dikes in the area) was originally thought to be of Paleozoic age by relative age dating using cross-cutting relationships. [1] In 1969, Fullagar and Bottino used K-Ar and Rb-Sr radiometric dating techniques to date rocks that they thought were temporally related to the Devonian Tioga Bentonite, but discovered that the rocks were actually a much ...
The volcano is composed of alkali feldspar granitic rock of the Robertson River Igneous Suite.This includes felsic complex material such as biotite, hornblende-biotite, magnetite, and alkali granitic rock including rhyolite on the eastern slopes of Battle Mountain [5] and the adjacent (and geologically related) Little Battle Mountain (elevation 937 feet).
Volcanoes of Virginia in the United States. Pages in category "Volcanoes of Virginia" The following 5 pages are in this category, out of 5 total.
The Mount Rogers area contains a unique record of the geohistory of Virginia. There is evidence from the rocks that volcanoes were part of the landscape. Roughly 760 million years ago, rift-related (divergent) volcanoes erupted along the axis of what later became the Appalachians, and one remnant of that volcanic zone, with its volcanic rocks, still can be seen at Mount Rogers.
David Benbennick made the outline map modified here. For more information, see Commons:United States county locator maps. Date: 15 September 2009, 18:33 (UTC) Source: File:Virginia counties and independent cities map.gif; File:Map of Virginia highlighting Floyd County.svg; Author: File:Virginia counties and independent cities map.gif: User:JosN
New Kent County was established in 1654 from York County, Virginia. Kent County, England: 26,134: 210 sq mi (544 km 2) Northampton County: 131: Eastville: 1634: Original county of the Colony under England, initially named Accomac Shire. In 1642, it was renamed Northampton County. However, in 1663, Northampton County was divided into two counties.
Map of all counties and independent cities in Virginia. Derived from Image:Map of Virginia highlighting Richmond County.svg, but with highlighting removed and all internal ids for counties changed to include "_County" to avoid conflicts with cities with the same name. Date: 21 April 2007 (original upload date) Source: No machine-readable source ...