| Text Description: |
From Dochat (1997): A 9 cm thick layer of pumice (individual pieces up to 1 cm in diameter) in silty matrix overlies the diamicton. The pumice is thought to be from an eruption of Mt. Dutton earlier than 9,090 +/- 140 14C yrs BP. A 66 cm thick sand layer of which the upper 1 cm is oxidized overlies the pumice deposit. Overlying the oxidized horizon is a layer of ash 1 cm thick and a 6 cm thick layer of medium grained silt. A wavy contact separates the silt from the overlying 1.5 cm of ash. A 4.5 cm thick layer of clayey silt occurs above the ash and is overlain by 12.5 cm of scoria. The middle scoria layer is 3 cm thick and oxidized. The upper 8 cm of black scoria corresponds with the Fisher caldera ash exposed throughout the Cold Bay and False Pass regions. Coarse sand, 8.5 cm thick, crops out above the Fisher caldera ash. A layer of medium-grained sand 35 cm thick occurs above this. A 20 cm thick horizon of clay caps the sand. Organic-rich material (6,020 +/- 340 14C yrs BP), 30 cm thick, overlies the clay. Within the organic material, thin ash layers (1 cm thick) occur with wavy contacts, dipping up to 20 degrees. A planar, horizontal contact separates the organic-rich layer from the overlying 2 cm of ash above which is 6 cm of additional organic-rich material. A 5 cm thick ash layer occurs at the base of the 122 cm of sand that cap the bluff. Unclear which samples correlate to which units, as no sample descriptions are provided. |