EVOLUTION OF A MEANDER BEND ON THE CATAWBA RIVER NEAR CHARLOTTE, NC
Three facies occur in the cores, from oldest to youngest: 1) a fining upward sequence of medium to fine sand (point bar deposits), 2) an organic-rich silt to very fine sand (oxbow lake deposits), and 3) thinly bedded, medium to coarse sands at the top of the cores (crevasse splay deposits on the modern flood plain). Analysis of aerial imagery and GPR profiles suggest the presence of an abandoned channel which is consistent with the interpretation that Duck Cove is an oxbow lake. C14 dating of one charcoal sample from the oxbow lake deposits provides a minimum age for the cutoff event and subsequent formation of the oxbow lake at 5377 +/- 60 years BP. Previous work which uses terrace relief (i.e. terrace elevation – river elevation = terrace relief) as a proxy for age places the cutoff event at less than 4000 years BP (Layzell, 2012). The results of this study suggest that the regional curve for terrace relief (Mills, 2000; Figure 1) needs refinement for relatively young terrace deposits.