The Piedmont of Virginia is the broad belt of rolling country in the center of the state. It lies east of the Blue Ridge mountains and west of the Coastal Plain.
Quick answer: The Piedmont of Virginia lies between the Fall Zone on the east and the Blue Ridge on the west. It is the largest geologic province in the state. Its gently rolling land rests on very old igneous and metamorphic rocks, usually buried under a thick layer of weathered rock called saprolite.
Contents
Location and Boundaries
The Piedmont is bounded on the east by the Fall Zone, which separates it from the younger layers of the Coastal Plain, and on the west by the mountains of the Blue Ridge.[1] It is the largest geologic province in Virginia.[1]
The land is gently rolling. It becomes more rugged toward the foothills of the Blue Ridge.[1]
Ancient Rocks Under the Soil
The bedrock of the Piedmont is mainly igneous and metamorphic rock from the Proterozoic and Paleozoic eras. These rocks form the deep core of the ancient Appalachian mountain belt, and granite bodies from the late Paleozoic are common.[1]
The bedrock is usually buried under saprolite (rock that has weathered in place into a soft, clay-rich material). The saprolite is about 2 to 20 meters (roughly 7 to 65 feet) thick. For this reason, bare rock is seen mostly in stream valleys, where erosion has removed the cover.[1]
The Mesozoic Basins
Inside the Piedmont lie basins of younger rock from the early Mesozoic era. They formed when the crust began to pull apart, and they contain sedimentary rocks, diabase dikes and basalt flows.[1] Some basins preserve dinosaur, fish and insect fossils, and coal formed in swampy lowlands in a few of them.[1] Virginia Energy treats these basins as a sixth geologic province.[2]
Frequently asked questions
Where is the Piedmont region of Virginia? In central Virginia, between the Fall Zone and the Blue Ridge.
Is the Piedmont the largest region in Virginia? Yes. It is the largest geologic province in the state.
What is saprolite? Rock that has weathered in place into a soft, clay-rich layer. In the Piedmont it is about 2 to 20 meters thick.
Are there dinosaur fossils in the Piedmont? Some Mesozoic basins in the Piedmont preserve dinosaur, fish and insect fossils.
References
- [1] The Geology of Virginia (William and Mary), Piedmont – last checked 11/08/2026
- [2] Virginia Energy, Geology and Mineral Resources: Virginia Provinces and Fossils – last checked 11/08/2026
The other provinces are described in The Regions of Virginia.