Relative sea level and the limits to preservation of earthquake

A Tolcapone collected from the organic sand above bed D yields a minimum limiting age for sand deposition of 4856–5260 cal yr BP (Fig. 6a).
4.5. Sand bed C and under- and overlying units (Pit 18)
Between 1.5 and 1.89 m MTL, a light brown, very poorly sorted organic (LOI 37%) silt (unit 3; mean = 3.41 Φ; D10 = 6.88 Φ; Fig. 6 and Fig. 7a) overlies the basal sand in Pit 18. Like the underlying basal sand, diatom assemblages in the organic silt are dominated by marine (e.g., T. fasciculata, A. brevipes var. intermedia, A. brevipes, and C. scutellum) and brackish (e.g., G. nodiferum and Surirella striatula) species ( Fig. 9).
At 1.89 m MTL, a sharp contact separates unit 3 from bed C, a 4-cm-thick, gray, well sorted, mica-rich, fine quartz sand (mean = 2.45 Φ; D10 = 3.77 Φ; Fig. 6 and Fig. 7a) containing little organic material (LOI < 6%). The diatom assemblage within bed C is pelagic zone dominated by marine and brackish diatoms (e.g., T. fasciculata, A. brevipes var. intermedia, A. brevipes, S. striatula and G. nodiferum) including the planktonic Paralia sulcata, which is not found in organic units under- and overlying the sand bed ( Fig. 9). An increase in mean grain size and a decreased fine fraction distinguishes bed C from under- and overlying silty sediments by (Fig. 7a).