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The coastal plain is a 70 mile wide, gently sloping surface composed of Holocene to Late Pleistocene (less than 800,000 year old) sediments - clay, silt, and sand - deposited by streams and rivers. Further inland, the slope steepens at the contact with underlying Early Pleistocene to Late Pliocene (800,000 to 3,600,000 year old) strata.
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