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Northern Allegheny Plateau

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Map Legend & Subregion List

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NameColor on MapEPA Code*
Glaciated Low Allegheny Plateau60a
Delaware-Neversink Highlands60b
Catskills Transition60c
Finger Lakes Uplands and Gorges60d
Glaciated Allegheny Hills60e
Cattaraugus Hills60f

* This code refers to the US EPA's Level 4 ecoregion codes for the continental U.S., see here.

About the Northern Allegheny Plateau

The Northern Allegheny Plateau, also sometimes referred to as the Northern Appalachian Plateau and Uplands, is a somewhat irregularly-shaped region stretching arcoss much of the southern border of upstate New York, extending into northeast Pennsylvania as well. Like surrounding areas, this area was recently glaciated.

The landscape is flat over a large spatial scale, but locally there are hills, ridges, and valleys throughout the region. The underlying rock is sedimentary; Devonian sandstones make up the more erosion-resistant ridges, whereas lowlands have more erodable shales and siltstone. The topography is flatter than the North Central Appalachians to the south or the High Allegheny Plateau to the southwest, and more suitable for agriculture. There are numerous glacial lakes throughout the region.

Naturally this area was mostly Appalachian oak forest, with some northern hardwood forests at the higher elevations. Agriculture here is common, and is interspersed with small pieces of forest. Although the remaining forest here is mostly highly fragmented by agriculture, some larger tracts of forest exist in the form of State Game Lands in Pennsylvania and New York state parks.

This region is bordered to the north by the flatter Eastern Great Lakes Lowlands. To the west there is a small border with the Erie Drift Plain. To the south, this region is bordered by the higher-elevation and more rugged North Central Appalachians, and at the east there is a small border with the Northeastern Highlands.

References

1. Wiken, E., Griffith, G. "North American Terrestrial Ecoregions - Level III", Commission for Environmental Cooperation, (2011) Web.