VALLEY-FILL VERSUS INTERFLUVE: QUATERNARY DEPOSITIONAL PATTERNS RESULTING FROM SEA LEVEL FLUCTUATION, NORTHEASTERN NORTH CAROLINA
Sediment relationships within depositional sequences display vertical successions of as many as four major facies: fluvial/non-marine, estuarine, barrier island, and shallow marine. Foraminiferal and molluscan fossil assemblages indicate that the marine facies of these sequences were deposited in a shallow marine embayment with open connection to shelf waters. Each successive sequence modifies or truncates portions of the preceding sequence or sequences. Depositional sequence boundaries are the product of a combination of fluvial, estuarine, and marine erosional processes. Amino-acid racemization (AAR) has constrained the age of the ten uppermost depositional sequences to younger than 220 ka indicating that these depositional sequences do not each represent a complete interglacial, but rather are the result of multiple sea level oscillations within major interglacial stages.