Click on one of the sub-cells for a large, detailed map of the duneridges, earthquake scarps an C14 locations. For an interactive version, choose Interactive Maps from the main menu.
Figure 4a - Locations in North Beach sub-cell of Columbia Littoral Cell	Figure 4b- Locations in Grayland Plains sub-cell of Columbia Littoral Cell	Figure 4c - Locations in Longbeach sub-cell of Columbia Littoral Cell	Figure 4d - Locations in Clatsop Plains sub-cell of Columbia Littoral Cell
Figure 4: GIS-LIDAR Map of 1) radiocarbon sample sites, 2) early historic shoreline position from 1870’s US T-sheets (seaward north-south line; Kaminsky et al., 1999), 3) key foredune ridges (north-south lines), GPR tracklines (west-east lines from Figure 3), and identified beach retreat features (letters) in the CRLC. Background topography (color key) is from a LIDAR survey (Daniels, 2000). Radiocarbon sample dates are from Rankin (1983), Woxell (1998), Herb (2000), and Schlichting (2000). The radiocarbon sample dates are listed with UTM coordinates in Table 2. Identified foredune beach-ridges from west to east are the ‘Big Dune Ridge’ set (0.3-1 ka), the ‘Mid-Dune Ridge’ set (>2.5 ka) and the ‘Old Dune Ridge’ (~4.2 ka). These master ridges or ridge sets are generally separated by broad interdune-valleys. Additional foredune-beach ridges are apparent in the LIDAR topography. More detailed analysis of the foredune beach-ridges in some subcells have been performed by Rankin (1983), Phipps and Messmer (1984), and Reckendorf et al. (2001). A detailed compilation of the CRLC foredune beach-ridges is underway.