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The geology of Virginia began to form at least 1.8 billion years ago. The oldest rocks in the state were metamorphosed during the Grenville orogeny , a mountain-building event beginning 1.2 billion years ago in the Proterozoic , which obscured older rocks.
The Edinburg Formation is an Ordovician-age geological formation in Virginia. It is primarily composed of basinal (deep sea) limestone and shale, and is one of the younger units in the "Middle Ordovician" sequence of the Shenandoah Valley. However, fossils have shown that it actually was deposited in the early part of the Late Ordovician.
Type Section: Yorktown, Virginia on southwest side of York River, York County Carters Grove Bluffs, north side of James River [ 4 ] 37°12′33″N 76°38′00″W / 37.20917°N 76.63333°W / 37.20917; -76
A part of Virginia's Western Piedmont Province, the uranium deposit is bounded by the Chatham fault to the east, where it borders the Triassic Danville basin. Uranium minerals are found in the footwall of the Chatham fault, in healed fractures where apatite crystallized from high-temperature hydrothermal water in the Leatherwood granite mylonite .
During the warm late Eocene, sea levels were high, and the tidewater region of Virginia lay in the coastal shallows. The shore of eastern North America, about where Richmond, Virginia is today, was covered with thick tropical rainforest, and the waters of the gently sloping continental shelf were rich with marine life that was depositing dense layers of lime from their microscopic shells.
Pages in category "Geology of Virginia" The following 11 pages are in this category, out of 11 total. This list may not reflect recent changes. ...
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.
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