| 21. | Laurasia was created near the end of the Silurian Period.
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| 22. | Being in the fourth Madame Vastra, another Silurian character.
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| 23. | It is the only marrellomorph known from the Silurian period.
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| 24. | He also researched microfossils from the Scandinavian Silurian and Ordovician.
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| 25. | Silurian trilobites left behind remains in northern and southwestern Illinois.
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| 26. | "Hindia " sponges lived in the Silurian near Chicago.
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| 27. | They appeared in the late Silurian, about 419 million years ago.
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| 28. | The genus is found in deposits of the Silurian age in Sweden.
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| 29. | The Vinini is overlain depositionally by Middle Silurian sandy strata.
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| 30. | It is largely dug into boulder clay but also into Silurian grit.
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