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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.
- Calymmian (Wikipedia)
The Calymmian Period (from Ancient Greek: κάλυμμα, romanized: kálymma, meaning “cover”) is the first geologic period in the Mesoproterozoic Era and lasted from 1600 Mya to 1400 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.
