While not usually described as gorges the Philadelphia area contains numerous narrow stream and river valleys which for all practical purposes should be called gorges. Most Philadelphia area gorges are 350 feet or less in depth and have been eroded into erosion resistant metamorphic and sedimentary rocks. Some Philadelphia area gorges now serve as major […]
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Water gaps are formed where a stream or river has cut a valley across some type of ridge. Pennsylvania’s water gaps are often associated with where streams and rivers have cut what are sometimes spectacular water gaps in the state’s Valley and Ridge Province. Often overlooked are numerous, but somewhat less specular water gaps found […]
Phillylandforms.info 