| 31. | Various Silurian and Devonian sedimentary formations exist in the area as well.
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| 32. | A young Silurian orders Baker infected with a virus before he is released.
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| 33. | This happened at the end of the Ordovician and during the early Silurian.
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| 34. | This story introduces the aquatic cousins of the Silurians, the Sea Devils.
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| 35. | Casey is underlaid by rocks from the Silurian period.
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| 36. | Like Inishbofin, Inishark is composed almost entirely of Silurian slates and shales.
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| 37. | Thus, the first insects probably appeared earlier, in the Silurian period.
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| 38. | They lived in shallow seas during the Early Ordovician through the Early Silurian.
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| 39. | The ship, however, registers no Silurian life forms left on board.
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| 40. | Eisenack's work extended from the Silurian into the Ordovician and Cambrian.
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