USGS - science for a changing world

Geology and National Parks


Geology, Minerals, Energy and Geophysics Science Center home

The information found here reflects completed USGS work. The content of this page is static and has not been updated since the mid 2000's.

| Pacific | | Columbia Plateau | | Basin and Range | | Colorado Plateau |
| Rocky Mountain | | Laurentian Upland| | Interior Plains | | Interior Highlands |
| Appalachian Highlands | | Atlantic Plain | | Alaskan | | Hawaiian |

| Geologic province home | | Geologic time | | Plate tectonics | | Tapestry of Time and Terrain |

Geologic Provinces of the United States: Appalachian Highlands

Delaware River

Delaware River

Photo by Jack B Epstein, USGS

The Delaware River makes a sweeping bend as it heads throogh the world-famous Delaware Water Gap. The bend of the river mimics the underlying geology. The Shawangunk Formation of Silurian age, comprising very hard quartzite and holding up Kittatinny Mountain, dips moderately northward and is overlain by finer clastics of the Bloomsburg Red Beds, also Silurian in age. The dip flattens out under Dunnfield Creek (along which the Appalahcian Trail ascends the mountain) beyomd which the Bloomsburg is thrown into a series of small folds overlying a broader fold in the buried Shawangunk. The bend in the river mimics the form of that anticlinal fold. Approximately 20,000 years ago, Wisconsinan glacialice occupied this valley and a kame terrace of sand and gravel was deposited along Dunnfield Creek (Qkt). The National Park Service visitor's center is located at the arrow.

Appalachian Highlands

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: G & G Webmasters
Page Last Modified: 21-Apr-2017@16:35