1. Much of the shelves were exposed during glacial periods and interglacial periods. 2. The Oak Ridges Moraine probably formed in the Late Wisconsin glacial period . 3. This plant has survived the last glacial period as a relict organism. 4. High contents correspond to warm interglacial periods, and low to glacial periods . 5. The Pinedale Glaciation, another local glacial period , occurred after this warm period. 6. During the last glacial period , ice enclosed nearly all of these mountains. 7. During this period, the last of the four glacial period had already ended. 8. At the end of the last glacial period the basin filled with meltwater. 9. The U-shaped valley is deep and was formed during the last glacial period . 10. This hill is part of the terminal moraine of the last glacial period .
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