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