Atlantic Coastal Plain
One of the smallest provinces in the state and is confined to Philadelphia, Delaware, and Bucks counties along the Delaware River. Local relief is less than 200 feet (61 m) and much of the bedrock is buried under recent alluvial deposits. On the geologic map, "Trenton Gravel" is used to describe most of these sediments. However, much of the alluvial sediments that exist here are sand, silt, and clays. The traditional boundary of the coastal plain is the fall line. The coastal plain in Pennsylvania was once home to thousands of acres of fresh water tidal marsh. This was important in the early development of Philadelphia and Chester. Many of the small tributaries to the Delaware have cut small but impressive gorges into the bedrock including the Ridley Creek, the Chester Creek, and the Wissahickon Creek. Flash floods are becoming a local problem in the province.
Read more about this topic: Geology Of Pennsylvania
Famous quotes containing the words atlantic and/or plain:
“Boys hide in lunging cubes
Crouching to explode,
Beyond the Atlantic skies,
With cheerful cries
Their barking tubes
Upon the German toad.”
—Allen Tate (18991979)
“The trick, which requires the combined skills of a tightrope walker and a cordon bleu chef frying a plain egg, is to take your [preteen] daughter seriously without taking everything she says and does every minute seriously.”
—Stella Chess (20th century)