High-resolution ground-penetrating radar (GPR) images of the internal stratigraphy of linear dunes in the Namib Sand Sea of Namibia are used to demonstrate changing current directions, bedform accumulation patterns, and non-depositional and erosional events. The primary observation is an upward change from an active superimposed dune migration phase to an active planar laminated draping phase, separated by a distinct erosional surface. We integrate the results from the Namib Sand Sea with GPR mapping of the internal stratigraphy of a Pleistocene sub-aerial shoreline deposit from ancient Lake Bonneville in northwestern Utah (USA). In both of these very different depositional settings, key surfaces are delineated that separate distinct sedimentological phases, which would be far below the resolution of seismic methods. Horizon-flattening along the base of the draping phase accentuates the change in depositional regime in the adjacent stratigraphic layers.
Presentation Date: Monday, October 12, 2020
Session Start Time: 1:50 PM
Presentation Time: 3:55 PM
Location: 360D
Presentation Type: Oral
