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- An example of glacial till along Rosario Beach on Fidalgo Island.
- Till (Wikipedia)
Till or glacial till is unsorted glacial sediment. Till is derived from the erosion and entrainment of material by the moving ice of a glacier. It is deposited some distance down-ice to form terminal, lateral, medial and ground moraines. Till is classified into primary deposits, laid down directly by glaciers, and secondary deposits, reworked by fluvial transport and other processes.
- The majority of soils in the [Georgia] depression are formed from glacial till, glacial outwash, and Lacustrine deposits.
- Most till consists predominantly of clay, silt, and sand, but with pebbles, cobbles, and boulders scattered through the till.
- Columbia River drainage basin (Wikipedia)
The Columbia River drainage basin is the drainage basin of the Columbia River in the Pacific Northwest region of North America. It covers 668,000 km2 or 258,000 sq mi. In common usage, the term often refers to a smaller area, generally the portion of the drainage basin that lies within eastern Washington.
