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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.
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
U.S. Geological Survey National Center visitor entrance in 2011. The approximately 1,000,000 sq. ft., 1,200 foot long U.S. Geological Survey National Center building sits on a 105-acre site and is divided into three main sections—the agency administration offices, the laboratories, and the map reproduction area. [3]
In 2015, the USGS unveiled the topoView website, a new way to view their entire digitized collection of over 178,000 maps from 1884 to 2006. The site is an interactive map of the United States that allows users to search or move around the map to find the USGS collection of maps for a specific area.
USGS map colored by paleogeological areas and demarcating the sections of the U.S. physiographic regions: Laurentian Upland (area 1), Atlantic Plain (2-3), Appalachian Highlands (4-10), Interior Plains (11-13), Interior Highlands (14-15), Rocky Mountain System (16-19), Intermontane Plateaus (20-22), & Pacific Mountain System (23-25) The legend ...
The Potomac Group is a geologic group in Delaware, Maryland, New Jersey, and Virginia. It preserves fossils dating back to the Cretaceous period . An indeterminate tyrannosauroid and Priconodon crassus , a nodosaurid , are known from indeterminate sediments belonging to the Potomac Group. [ 1 ]
The U.S. Geological Survey (USGS) reported that a magnitude 5.8 M w earthquake hit Virginia on Tuesday, August 23, 2011, at 17:51:04 UTC (1:51 pm Eastern Daylight Time). The quake occurred at an approximate depth of 3.7 miles and was centered in Louisa County (location at 37.936°N, 77.933°W), 5 miles SSW of Mineral, Virginia and 37 miles NW of Richmond, Virginia's capital. [3]
The Chesapeake Group is a geologic group in Maryland, Virginia, Delaware, and North Carolina. [1] [2] [3] It preserves mainly marine fossils dating back to the Late Oligocene through the Pliocene epochs of the Neogene period. [4] This group contains one of the best studied fossil record of Neogene oceans in the world.