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Monongahela Transition Zone

Ecoregion in KY, WV, OH, PA

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The unglaciated hills, knobs, and ridges of the Monongahela Transition Zone (70b) are typically underlain by interbedded limestone, shale, sandstone, and coal of the Monongahela Group (Berg and others, 1980; Cardwell and others, 1968). Entrenched rivers, gently dipping strata, and land slips occur. Elevations range from 575 to 1900 feet (175-580 m) and local relief is 200-700 feet (61-213 m). Soils are derived from residuum and are typically Alfisols; they are similar to those of Ecoregion 70a and have a higher base saturation than the Ultisols and Inceptisols of Ecoregion 70c. Guernsey, Dormont, Culleoka, Westmoreland, Clarksburg, and Neward soil series are common. The potential natural vegetation is mapped as mostly Mixed Mesophytic Forest while that of Ecoregion 70a is primarily Appalachian Oak Forest (dominants: white and red oaks) (Kuchler, 1964).

— EPA

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