| 1. | Quartizite from the Silurian Period can be found in this water gap.
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| 2. | These rocks are 414 million years old from the Silurian period.
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| 3. | The sea withdrew from Minnesota for the duration of the ensuing Silurian period.
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| 4. | The rocks at the site date to the Silurian period of geological time.
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| 5. | The same erosional and depositional processes continued on through the ensuing Silurian period.
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| 6. | Thus, the first insects probably appeared earlier, in the Silurian period.
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| 7. | The state was submerged by the sea once more during the ensuing Silurian period.
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| 8. | Laurasia was created near the end of the Silurian Period.
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| 9. | It is the only marrellomorph known from the Silurian period.
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| 10. | This was followed by plants emerging in late Ordovician Period and early Silurian Period.
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