What sediments form the Atlantic coastal plain?

The Atlantic coastal plain is primarily formed from a variety of sediments, including sand, silt, clay, and gravel, which are primarily derived from erosion and weathering of the Appalachian Mountains and other nearby landforms. These sediments were deposited by ancient rivers, ocean currents, and glacial processes during different geological periods. Additionally, marine deposits from the rising and falling sea levels over time have contributed to the composition of the coastal plain. The result is a diverse sedimentary landscape that supports various ecosystems and human activities.