The Appalachian Plateau is a physiographic province of the larger Appalachian Mountains system in the eastern United States. It extends from western New York and Pennsylvania southward through Ohio, West Virginia, Kentucky, Tennessee, and into Alabama and Georgia. The plateau is characterized by a relatively flat‑lying sequence of sedimentary rocks—primarily sandstones, shales, and coal seams—tilted only gently eastward, creating a series of dissected ridges, valleys, and highlands.
Geology
The underlying strata were deposited during the Paleozoic era, chiefly in Mississippian to Pennsylvanian periods. Subsequent uplift associated with the Alleghenian orogeny raised the region, and later erosion by streams and glaciers incised the plateau, producing the present rugged topography. Coal mining has been a major economic activity due to the abundant coal seams within the strata.
Topography and Hydrology
Although called a “plateau,” the area is heavily dissected by river systems such as the Allegheny, Monongahela, Ohio, and Tennessee rivers and their tributaries. Elevations generally range from 1,200 to 4,300 feet (366–1,311 m) above sea level, with the highest points located in the northern and central sections.
Climate
The climate is humid continental in the northern portion, transitioning to humid subtropical farther south. Precipitation averages 35–55 inches (890–1,400 mm) annually, with snowfall common in the higher elevations of the northern plateau.
Ecology
Vegetation comprises mixed mesophytic forests of oak, hickory, maple, and pine, interspersed with Appalachian hemlock and understory species such as rhododendron and mountain laurel. The region supports diverse wildlife, including white-tailed deer, black bear, wild turkey, and numerous amphibian and fish species adapted to the cool, clear streams.
Human Settlement and Land Use
Historically, the plateau was inhabited by various Indigenous peoples, including the Shawnee and Cherokee. European settlement accelerated in the 18th and 19th centuries, driven by timber extraction, agriculture on the valley bottoms, and coal mining. Today, the economy is mixed, integrating energy production, manufacturing, tourism, and conservation.
Conservation
Significant portions of the plateau are protected within national forests (e.g., Allegheny and George Washington National Forests) and state parks. Conservation efforts focus on forest health, water quality, and mitigation of the environmental impacts of mining and surface extraction.
References
- United States Geological Survey (USGS), “Physiographic Provinces of the United States.”
- Hamblin, J. G. (1980). Geology of the Appalachian Plateau. Geological Society of America.
- U.S. Forest Service, “Appalachian Plateaus – National Forests and Parks.”
